mmi 20018786(densitometer)
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Installation & Configuration ManualP/N MMI-20018786, Rev. AB
December 2011
Micro Motion 7835/45/47
Liquid Density Meters
Standard and Advanced Electronics
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2011, Micro Motion, Inc. All rights reserved. The Emerson logo is a trademark and service mark of Emerson Electric Co. MicroMotion, ELITE, ProLink, MVD and MVD Direct Connect marks are marks of one of the Emerson Process Management family ofcompanies. All other marks are property of their respective owners.
Micro Motion pursues a policy of continuous development and product improvement. The specification in this document maytherefore be changed without notice. To the best of our knowledge, the information contained in this document is accurate andMicro Motion cannot be held responsible for any errors, omissions, or other misinformation contained herein. No part of thisdocument may be photocopied or reproduced without prior written consent of Micro Motion.
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Chapter 1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1 Safety guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 Product overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.3 Product range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.4 Electronics product range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.5 Advanced electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.5.1 Baseboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.5.2 Option board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.5.3 Remote display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.6 2004/22/EC (MID) applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Chapter 2 Installation Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.1 General information applicable to the complete system . . . . . . . . . . . . . . 72.2.2 Pressure bearing parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Installation planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.4 Meter mounting and pipework. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.5 Pressure drop in the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.6 Calculation of pressure drop in the meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.7 Special considerations for hygienic applications (7847 meter only) . . . . . . . . . . . . . 142.8 7845/47 and 7845/47 Entrained Gas Meters with Remote Amplifier . . . . . . . . . . . . 142.9 Post-installation checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162.10 Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chapter 3 Electrical Connections (Standard). . . . . . . . . . . . . . . . . . . . . . . . . 213.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213.2 MID (2004/22/EC) Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.2.1 Securing the meter for MID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213.3 Ground connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223.4 Use with Micro Motion signal converters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.4.1 System Connections (Hazardous Area only). . . . . . . . . . . . . . . . . . . . . . 223.4.2 System connections (Safe Area only) . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.5 Use with customers own equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233.5.1 System connections (Safe Area only) . . . . . . . . . . . . . . . . . . . . . . . . . . . 233.5.2 System Connections (Hazardous Area only). . . . . . . . . . . . . . . . . . . . . . 25
3.6 Post-installation checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Chapter 4 Electrical Connections (Advanced) . . . . . . . . . . . . . . . . . . . . . . . . 274.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274.2 MID (2004/22/EC) Requirements (7835/7845 Only) . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.2.1 Securing the meter for MID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.3 Planning an Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294.4 Electrical installation in safe areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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4.4.1 Electrical Installation with Signal Converter . . . . . . . . . . . . . . . . . . . . . . 314.5 Electrical installation in hazardous areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.5.1 Safety Barrier and Galvanic Isolator Selection . . . . . . . . . . . . . . . . . . . . 324.5.2 Electrical connections in a hazardous area . . . . . . . . . . . . . . . . . . . . . . . 34
4.6 Baseboard Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394.7 Baseboard plus HART Option Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.7.1 Electrical Installation for HART Communications . . . . . . . . . . . . . . . . . 404.8 Advanced Density Post-Installation Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Chapter 5 Electrical Connections (Entrained Gas Option) . . . . . . . . . . . . . . . . 435.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435.2 Ground Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435.3 Use with Signal Converters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3.1 System Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435.4 Use with Customers Own Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.4.1 System Connections for Safe Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445.5 Post-Installation Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Chapter 6 Calibration and Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.1.1 For Standard Electronics Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476.1.2 For Advanced Electronics Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.2 Interpretation of calibration certificate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486.2.1 General density equation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486.2.2 Temperature correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486.2.3 Pressure correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486.2.4 Velocity of sound correction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.3 Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 546.3.1 Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 546.3.2 Calibration of transfer standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 546.3.3 Instrument calibration certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 556.3.4 Pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 556.3.5 Insulation test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 556.3.6 Calibration check methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.4 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Chapter 7 Remote Display and Digital Communications. . . . . . . . . . . . . . . . . 597.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 597.2 Mechanical Installation of the 7965 Remote Display . . . . . . . . . . . . . . . . . . . . . . . . 597.3 Safe Area Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 617.4 Hazardous Area Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 617.5 Configuring the Baseboard using the Remote Display . . . . . . . . . . . . . . . . . . . . . . . 61
7.5.1 Power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 617.5.2 Slave address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 627.5.3 Demo mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 627.5.4 Navigating the menu structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 627.5.5 Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
7.6 Multi-drop installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 667.7 Electrical installation of Computer Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
7.7.1 Connections using an RS-232/485 Converter. . . . . . . . . . . . . . . . . . . . . 67
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Chapter 8 Using ADView and ProLink II . . . . . . . . . . . . . . . . . . . . . . . . . . . . 718.1 Using ADView Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.1.1 What is ADView? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 718.1.2 Installing ADView . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.1.3 Starting ADView. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 728.1.4 Understanding ADView Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8.2 Using ProLink II Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 788.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 788.2.2 Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 788.2.3 Connecting from a PC to a transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . 788.2.4 ProLink II configuration upload/download . . . . . . . . . . . . . . . . . . . . . . . . 798.2.5 ProLink II language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Chapter 9 General Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 819.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
9.2 Fault analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 819.3 General maintenance procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 819.4 Physical checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
9.4.1 Check calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 829.4.2 Remedial servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Appendix A 7835 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85A.1 Density performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85A.2 Temperature specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
A.2.1 Integral temperature sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85A.3 Pressure ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
A.4 Hazardous area classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86A.5 OIML R117-1 classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87A.6 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87A.7 Materials of construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87A.8 Fluid containment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87A.9 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88A.10 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Appendix B 7845/7847 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89B.1 Density performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89B.2 Temperature specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
B.2.1 Integral temperature sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89B.3 Pressure ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90B.4 Hazardous area classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90B.5 OIML R117-1 classifications (7845 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90B.6 General classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
B.6.1 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91B.7 Materials of construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91B.8 Fluid containment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91B.9 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92B.10 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Appendix C Electronics Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93C.1 Standard Electronics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
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C.1.1 Meter Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93C.1.2 Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
C.2 Standard Entrained Gas Electronics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93C.2.1 Meter Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93C.2.2 Output Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
C.3 Advanced Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93C.3.1 Meter Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93C.3.2 Analog Output (including HARTOutput) . . . . . . . . . . . . . . . . . . . . . . . . 94C.3.3 Tube Frequency/Alarm Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94C.3.4 Temperature Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94C.3.5 Time Period Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94C.3.6 Remote Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
C.4 Environmental Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95C.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95C.4.2 IP rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Appendix D Calculations and Configurable Factors(Advanced Electronics) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97D.1 Baseboard configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97D.2 Baseboard diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98D.3 Meter calculations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
D.3.1 Base density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100D.3.2 Special function calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102D.3.3 Quartic equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Appendix E Calibration Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
E.1 Example calibration certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Appendix F Modbus Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115F.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115F.2 Outline of the Modbus communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115F.3 Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115F.4 Modbus dialect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
F.4.1 Register size and content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116F.5 Establishing Modbus communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116F.6 Modbus commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118F.7 Modbus register assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
F.8 Index and enumeration codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121F.8.1 Meter type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122F.8.2 Density, temperature, and pressure units . . . . . . . . . . . . . . . . . . . . . . . 122F.8.3 Special function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122F.8.4 Special function quartic equation name codes . . . . . . . . . . . . . . . . . . . 123F.8.5 Special function quartic equation units codes . . . . . . . . . . . . . . . . . . . . 123F.8.6 Averaging time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124F.8.7 Analog output selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124F.8.8 User-defined alarm variable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124F.8.9 Normal alarm states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125F.8.10 Alarm coverage codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125F.8.11 Alarm hysteresis codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
F.8.12 Software version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125F.8.13 Status register flags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
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Contents
Appendix G HART Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127G.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127G.2 HART basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
G.2.1 Physical form of transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
G.2.2 Transaction protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128G.2.3 Message structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128G.2.4 Data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128G.2.5 Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
G.3 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128G.3.1 HART conformance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
G.4 HART Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130G.4.1 Universal Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130G.4.2 Common Practice Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
G.5 Transmitter specific command structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131G.5.1 Command 128 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131G.5.2 Command 129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132G.5.3 Table 1 - Identification codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133G.5.4 Table 2 - Limits and constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133G.5.5 Table 3 - Output / transmitter variable designations . . . . . . . . . . . . . . 134G.5.6 Table 4 - Transmitter variable designations . . . . . . . . . . . . . . . . . . . . . 134
G.6 Summary of HART functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Appendix H Certified System Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137H.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Appendix I Return Policy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
I.1 General guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145I.2 New and unused equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145I.3 Used equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
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Contents
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ElectricalConnections(Ad
vanced)
ElectricalConnections(Standard)
Introd
uction
Chapter 1Introduction
1.1 Safety guidelines
Handle the 7835/45/47 liquid density meter with great care.
Do not drop the meter or subject it to severe mechanical shock.
Do not expose the meter to excessive vibration.
Ensure axial loading from pipework does not exceed 1/2 tonne. Ensure all electrical safety requirements are applied.
Ensure the meter and associated pipework have been pressure tested to 1-1/2 times the
maximum operating pressure.
Do not use liquids incompatible with the construction.
Do not operate the meter above its rated pressure.
Do not expose the meter to excessive vibration (> 0.5 g continuous).
Ensure meter is not transported when it contains hazardous substances. This includes fluids
that may have leaked into, and are still contained, within the case.
To return a meter, refer to Appendix I for more information on the Micro Motion return policy.
Safety messages are provided throughout this manual to protect personnel and equipment. Read each
safety message carefully before proceeding to the next step.
1.2 Product overview
All of the products consist of a mechanical meter and an electronics unit that is normally mounted
inside the meter electronics housing. Together, the electronics and meter provide a system for
continuous on-line measurement of liquid density and temperature.
In applications where the pipeline temperature could exceed 110 C (230 F), the electronics should
be mounted in a Remote Amplifier Box (see Chapter 3 and Chapter 4 for more details.)
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2 Micro Motion 7835/45/47 Liquid Density Meters
Introduction
Figure 1-1. 7835/45/47 liquid density meter
Liquid density is determined from the resonant frequency of a vibrating tube containing the liquid,
and liquid temperature is determined from a 100- RTD.
1.3 Product range
The meters are identical mechanically, except for the material used in the wetted parts and the
flanges/couplings. A fully welded design is utilized to ensure maximum reliability in the most severe
environments. A rupture disc is embodied in the meter end plate furthest from the amplifier housing.
This disc will rupture if a pressure build-up occurs within the case, in the unlikely event of a tube
assembly leak; the operation of the rupture disc is shown in Figure 2-2.
1.4 Electronics product range
The meters described above may be operated with any of the following electronics options. However,
the electronics options are not all directly interchangeable; this is because the Advanced electronics
boards are physically longer than the Standard electronics boards, and so only fit in the extended
electronics enclosures provided with an Advanced meter.
It should be noted that the Standard Entrained Gas Electronics are NOT suitable for operation in
hazardous areas, whereas all of the other electronics boards are suitable.
For further details of the performance of the different electronics boards, please refer to the
appropriate chapters.
Table 1-1. Meter product range
Meter Tube material Features
7835 NI-SPAN-C Low temperature coefficient and long term stability, appropriate for fiscalapplications.
7845 316L Stainlesssteel
Good resistance to corrosion.
7847 316L Stainlesssteel
Designed for the hygiene requirements of the food processing industry and has3A authorisation. Please refer to Section 2.7 for special cleaning and installationrequirements in hygienic applications.
Electronics Enclosure
Meter
transducers
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ElectricalConnections(Ad
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ElectricalConnections(Standard)
Introd
uction
1.5 Advanced electronics
In contrast to a meter fitted with Standard electronics (which requires a Signal Converter for
operation), the meter with Advanced electronics will provide a complete measurement system.
An Advanced baseboard, plus meter, provides a complete system for measuring liquid density and
liquid temperature. A Remote Display or one of the optional boards may be required if outputs needto be configured in the field or if additional functionality is required.
Table 1-2. Electronics product range
Standard Electronics
Density version Basic amplifier circuit providing a frequency signal (indicatingliquid density) and RTD resistance (indicating liquid temperature).Interfaces with a Signal Converter.
Entrained gasversion
Similar amplifier circuit to the above but meter operating at a lowerfrequency which is more insensitive to entrained gas. It is NOTsuitable for operation in hazardous areas.
Advanced Electronics
Density version
Entrained gasversion
Microprocessor controlled circuit with a choice of analog anddigital outputs providing a direct measurement of density andtemperature. Also providing a selection of calculated parametersand several diagnostic functions.As above but meter operating at a lower frequency moreappropriate for liquids with entrained gas. Suitable for operation inhazardous areas.
Remote Amplifier Box
AdvancedElectronics
Suitable for operation in hazardous areas.784521A: IIB Approval (ATEX)784522A: IIC Approval (ATEX)
784523A: CSA Approval784524A: Non-classified (supplied as spare for customerinstallation).
Note that the advanced electronics amplifier cannot be fitted intothe Standard electronics Remote Amplifier Box.
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4 Micro Motion 7835/45/47 Liquid Density Meters
Introduction
Figure 1-2. Advanced electronics baseboard and remote display
For convenience, the Advanced system design and performance are outlined below.
1.5.1 Baseboard
The baseboard can be considered the heart of the system. Along with a liquid density meter, it
provides a complete system for measuring liquid density and liquid temperature. The baseboard
performs a range of useful calculations and provides the following outputs:
Two fully configurable 420 mA outputs. One pulse output providing either an alarm status signal or the meter tube frequency.
An RS-485 digital communications link using RTU Modbus protocol.
1.5.2 Option board
The option board fits directly onto the baseboard. One option board is presently available.
HART board providing an additional 420 mA output and full HART communications.
Only one board may be fitted at a time.
1.5.3 Remote display
The 7965 remote display is intended for either handheld or wall-mounted use. It provides a
convenient means for displaying calculated data and for configuring or analyzing the system setup. It
communicates via the baseboard RS-485 digital communications link. One remote display can
communicate with a number of meters if they are connected together on the same RS-485 link.
1.6 2004/22/EC (MID) applications
Mobrey Limited, a division of Emerson Process Management, has evaluated the 7835 and 7845 liquid
density meters against OIML R117-1:2007 and WELMEC guide 8.8 for use in measuring systems for
the continuous and dynamic measurement of quantities of liquids other than water. This evaluationwas in compliance with the European Measuring Instrument directive (2004/22/EC) annex MI-005.
Baseboard
Option board Remote Display
7965DISPLAY
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You may use the evaluation certificate for the 7835 and 7845 liquid density meters, with written
permission of Mobrey Limited to assist in obtaining an EC-type examination certificate for the
complete measuring system.
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Introd
uction
Chapter 2Installation Procedure
2.1 General
This chapter describes the mechanical installation of the 7835/45/47 liquid density meter.
2.2 Safety Information
2.2.1 General information applicable to the complete system
These safety instructions are to be used whenever handling or operating this product. Suitably
trained personnel shall carry out the installation both mechanical and electrical in accordance
with the applicable local and national regulations and codes of practice for each discipline.
Safe working practices for the media and process concerned must be followed during the
installation and maintenance of the equipment. Depressurize and isolate the system before
starting to loosen or remove any connection.
If the equipment is likely to come into contact with aggressive substances, it is the
responsibility of the user to take suitable precautions that prevent it from being adversely
affected.
It is the responsibility of the installer/user of this equipment to ensure:
This product is not used as a support for other equipment or personnel.
This product is protected from impact.
It is important that this sensor is handled with care due to its weight and sensitivity to impact;
ensure lifting straps are fitted around flanged ends.
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8 Micro Motion 7835/45/47 Liquid Density Meters
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2.2.2 Pressure bearing parts
It is the responsibility of the installer/user of this equipment to ensure:
The materials of construction are suitable for the application.
All piping connections conform to the local and national regulations and codes of practice. The pressure and temperature limits for this equipment are not exceeded, if necessary by
the use of suitable safety accessories. See Table 2-1.
Correct gaskets/seals are fitted and are compatible with the media and process.
The installed sensor is adequately supported for weight and vibration effects.
Personnel are protected from hot burns by guards, thermal lagging or limited access.
Allow time to cool prior to carrying out maintenance operations. It is recommended that
HOT notices are fitted in the vicinity of the equipment where applicable.
Regular inspection for corrosion and wear are carried out, both internal and external.
The sensor must not be fitted until all installation work and final pre commissioning checks arecarried out. Do not remove blanking plugs until the sensor is fitted.
The sensor must be installed in compliance with this manual, to ensure correct fitting. This
applies to all variants.
The user should not repair this equipment, but general maintenance can be applied as
described within this manual.
Table 2-1 Pressure ratings: 316/316L dual-rated stainless steel
ProcessFlange fitting
Pressure Rating
20C 110C
Class 600 1440.2 psi (99.3 bar) 1203.8 psi (83.0 bar)
Class 900 2159.6 psi (148.9 bar) 1805.7 psi (124.5 bar)
PN40 580.2 psi (40.0 bar) 539.5 psi (37.2 bar)
PN100 1450.4 psi (100.0 bar) 1348.9 psi (93.0 bar)
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2.3 Installation planning
When planning the installation of a meter, it is important to consider the following factors:
2.4 Meter mounting and pipework
This section considers in more detail the mounting of the meters and the design of the associated
pipework, including the calculation of pressure drop in the meter.
The preferred methods of supporting the meter are shown in Figure 2-1.
Table 2-2. Installation considerations
Safety When installing in a process line, it is important that the construction material of the wettedparts (tube) is matched to the non-corrosive performance of the liquid passing through theinstrument. Failure to observe this requirement can cause deterioration of the central tube(the bellows) and loss in measurement accuracy, or even a failure if leaking occurs. Foradvice on which meter in the range is appropriate, please contact Micro Motion.
The NI-SPAN-C material of the central tube is not rated for sour service as defined inNACE specification MR0103-2005. For advice in this application, please contactMicro Motion.
Serviceability Installing the meter in a by-pass configuration allows it to be removed for servicing orcalibration without affecting the main pipeline. Possible by-pass configurations are shown inFigure 2-3.
PerformancePipe stresses andvibration
Axial load should not exceed tonne, so pipe-work should have a degree of flexibility.Excessive pipe vibration should be avoided. Figure 2-2 for preferable mounting positions.
Gas bubbles The presence of gas bubbles can seriously affect the meter performance and so thefollowing points should be considered: The liquid must always be at a pressure substantially above its vapor pressure. All pipe-work couplings and joints must be airtight. No vortex should be present at the inlet to the meter. Cavitations, caused by pumping, should not generate bubbles from dissolved gases. If a pump is used it should push rather than pull the product through the meter.
Meter orientation For low flow rates, for example 750 liters/hour (2.7 gal/min.), the meter should preferablybe mounted vertically or at an incline, with the flow in an upwards direction.
If the liquid contains solid particles, the direction of flow should be upwards unless theparticles are large enough not to be carried with the flow, in which case the direction offlow should be reversed.
The meter should be mounted with the electric cable running downwards therebyminimizing the ingress of water should a cable gland become defective.
Flow rate A fast flow rate, for example 3000 liters/hour (11 gal/min.), will help to achieve goodtemperature equilibrium and have a self-cleaning action.A low flow rate, for example 1000 liters/hour (3.7 gal/min.), is recommended if the productcontains particles which may cause erosion.The meters exhibit a small flow dependent density reading. For flow rates up to 15000liters/hour (55 gal/min) and assuming no consequent line pressure or product changes, themaximum density offset will be less than 0.2 kg/m3.
Temperature stability Thermally lag the meter and the inlet and slipstream/bypass-loop pipework to ensure goodtemperature stabilisation.
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10 Micro Motion 7835/45/47 Liquid Density Meters
Installation Procedure
Figure 2-1 Preferred methods of mounting meters (support)
For continuously high flow rates, the mounting position can be selected to simplify the associated
pipework and help minimize the pressure and temperature losses (see Figure 2-2).
1st
Meter supported
in two positions around
1 schedule 80 pipe.
Meter supported
in two positions around
outer case (4 diameter).
3rd
Meter supported
in two positions around
the immediate pipework.
2nd
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ElectricalConnections(Standard)
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Figure 2-2 Preferred methods of mounting meter (angles)
1st
FLOW
90o
Rupture plate blow out
Electric Cable
Direction of flow should
be reversed for slurries.
2nd
>60o
Rupture plate blow out
Electric Cable
Direction of flow should
be reversed for slurries.
FLOW
Flow rate should be kept high
to prevent gas bubbles & sediment
from forming on the resonant tube.
3rd
Rupture plate blow out
Electric Cable
FLOW
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12 Micro Motion 7835/45/47 Liquid Density Meters
Installation Procedure
Figure 2-3 Typical bypass pipeline configurations
S Bend MethodPressure Bend Method
Pitot Tube MethodLaminar Flow Method
Orifice Plate Method
Direction of Flow
Pump Method
PUMP
PUMP
Integral Cleaning System
CLEANING LIQUID
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2.5 Pressure drop in the meter
The pressure drop in the meter depends on:
Flow rate (V), and
Kinematic viscosity ()
2.6 Calculation of pressure drop in the meter
The meter should be considered as a straight pipe of 23.6 mm (0.929) internal diameter and 1.03 m
(40.551) in length. The following formula has been proven to apply to the meter by measurements at
12000 liters/hour (44 gal/min).
Where:
h = Pressure drop (bars)
f= Friction coefficient L = Pipe length (m) = 1.03 mm
D = Internal pipe diameter (mm) = 23.6 mm
V= Mean fluid velocity (m/s)
= Fluid density (g/cc)
g = 9.81 (m/s2)
For viscous or laminar flow (Reynolds NumberRe less than 2000):
Frictional Coefficient (f) = 16 ReFor turbulent flow (Re greater than 2500):
Frictional Coefficient (f) = 0.064 Re0.23
Where, pipeRe = 1000 x V x D [ = kinematic viscosity (cS)]In addition to the pressure drop caused by the liquid flow through the instrument, it will be necessary
to calculate the pressure drop in any associated sample pipework before concluding the system design
requirements.
Table 2-3. Pressure drop at various flow rates
Flow Rate Flow Velocity Pressure Drop
(liters/hour) (Vm/s) = 2 cS u = 10 cS1000 0.6 0.003 0.004(1)
(1) Indicates laminar flow (fluid density 1.0 g/cc)
4000 2.5 0.033 0.048
12000 7.6 0.238 0.345
h200 f L V
2
g D--------------------------------------------------=
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2.7 Special considerations for hygienic applications (7847 meter only)
The 7847 meter is specially designed for use in hygienic applications. The following points should be
considered when planning an installation for a hygienic application.
2.8 7845/47 and 7845/47 Entrained Gas Meters with Remote Amplifier
For operating in product temperatures greater than 230F (110 C), it is necessary to remove the
amplifier unit from direct contact with the meter to a remote position. For this purpose, a flexible
PTFE conduit with over-braiding of stainless steel mesh is introduced between the amplifier housing
and the new amplifier housing. Three twisted pair cable looms are fed through the conduit to
complete the extended meter/amplifier connections.
This high temperature arrangement allows the amplifier unit to be mounted in a more temperate
environment and in no way impairs the operational accuracy of the meter. The maintenance andcalibration procedures remain relevant to the re-configured meter assembly.
Figure 2-4 shows the installation for the 78452 version, which is for Advanced Electronics only.
Table 2-4. Considersations for hygienic applications
Meter orientation The 7847 shall be installed in the vertical plane to prevent the accumulation of productresidue in the convolutions of the bellows, causing contamination, especially during thefinal rinse when cleaning. The installation shall include a means of draining the meter.
Meter mounting The method of mounting the meter shall comply with 3-A recommendations. Process sealssuitable for the media and complying with 3-A recommendations shall be used.
Steam cleaning Where it is necessary to sterilize the meter using the steam cleaning process, ensure thetemperature and duration of cleaning does not exceed 250 F (121 C) for a period of30 minutes. Exceeding this limit may permanently damage the meters amplifier circuit.
Electrical installation Cable glands and blanking plugs with a minimum rating of NEMA 4/IP66, shall be used toensure the environmental rating of the enclosure is not reduced.
Post installation Ensure the cable glands, blanking plugs, lid, and seal are in place and tightened to preventmoisture and dust ingress.
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ElectricalConnections(Ad
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ElectricalConnections(Standard)
Introd
uction
Figure 2-4. 7845 with Advanced electronics remote amplifier unit installation
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16 Micro Motion 7835/45/47 Liquid Density Meters
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2.9 Post-installation checks
After installation, the meter should be pressure tested to 1.5 times the maximum working pressure of
the system but not to a value exceeding the meter test figure shown on the meter label.
If the pressure test figure is exceeded, the meter may be irrevocably damaged.
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2.10 Installation Drawings
Figure 2-5 Installation for the 7835/45/47 with Standard electronics
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18 Micro Motion 7835/45/47 Liquid Density Meters
Installation Procedure
Figure 2-6 Installation drawing for the 7835/45/47 with Advanced electronics
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Figure 2-7 Flanges used for the 7835/45/47 liquid density meters
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Chapter 3Electrical Connections (Standard)
3.1 General
This chapter describes the electrical installation of the 7835/45/47 liquid density meters with Standard
Electronics fitted. The units are identical, except where the 7845 and 7847 meters are to be used at
temperatures above 110C (230 F) when the remote amplifier version is recommended.
3.2 MID (2004/22/EC) Requirements
To comply with the MID (2004/22/EC) directive:
The digital communication (Modbus and HART) must be disconnected during operational use.
It can only be used for commissioning and maintenance.
Unused cable ports must be sealed with suitably rated blanking plugs.
After commissioning or maintenance of the meter, you must seal the enclosure cover to secure
legally relevant parameters from unauthorized modification.
See Section 3.2.1 for more information on securing the meter from unauthorized access to the
meter controls.
3.2.1 Securing the meter for MID
To seal the meter from unauthorized access after commissioning or maintenance, Micro Motion has
provided additional holes on the electronics housing cover to attach a locking wire to the transmitter
cover. The securing component must bear the mark as laid down by the national inspection authority.
Figure 3-1 illustrates the suggested method for sealing the meter.
Note: When installing the meter in a MID measuring system, you must consider the method in which
the system will be verified to meet MID requirements. This method may impact the design of the
measurement system, and we recommend you involve the national inspection authority early in the
design process.
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22 Micro Motion 7835/45/47 Liquid Density Meters
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Figure 3-1 MID seal method
3.3 Ground connections
The earthing pads on the mounting face of the amplifier unit MUST make good contact with the
meter case by the M3 cage nuts. The meter should be grounded via the pipework.
The external earth bonding point of the meter is located inside the maintaining amplifier housing.
The 0V power supply lead should be earthed at the supply end, or at the safety barriers if applicable.
3.4 Use with Micro Motion signal converters
3.4.1 System Connections (Hazardous Area only)
When the meter is used in a hazardous area, a safety barrier MUST be interposed between the meter
and the signal processing equipment. (See Chapter 3 for information on selecting a safety barrier.)
3.4.2 System connections (Safe Area only)The density system connections are illustrated in Figure 3-2.
For installation of the CSA certified unit in a hazardous area, refer to Appendix H.
For installation of the ATEX certified unit in a hazardous area, refer to the appropriate safety
instructions booklet shipped with your unit (also available at www.micromotion.com).
Stainless steel locking wire (supplied by MID inspector)
Bonding crimp (supplied by MID inspector)
Use hole in screw(s) to attach locking wire
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Figure 3-2 Electric connection diagram to signal converters
3.5 Use with customers own equipment
3.5.1 System connections (Safe Area only)
Power supply to density meter: 15.5 V to 33 V dc, 25 mA minimum
Power supply to RTD: 5 mA maximumThe frequency at which the meter is operating can be detected by using a series resistor in the +VE
power line. The value of resistance to be used for a given supply voltage must not exceed the value
obtained from the LOAD NOMOGRAM (Figure 3-4). The electrical connections to be made are
shown in Figure 3-3.
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24 Micro Motion 7835/45/47 Liquid Density Meters
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Figure 3-3 Electrical connection diagram to customers own equipment
Figure 3-4 Load resistance
7835/45/46/47 with
Standard Electronics
PRT
1
2
3
4
5
6
See Note
POWER +VE
SIGNAL +VE
POWERVE
SIGNAL VE
PRT SUPPLY +VE
PRT SIGNAL
PRT SUPPLY VE
Figure 3.2 - Electrical Connection Diagram
7835/45/46/47 with Standard Electronics to Customers Own Equipment
RPOS +
NEG -
SIG
Note: See Load Nomogram (Figure 3.3) to determine R value.
1F
1F
Meter
RTD
Figure 3.3 Load Resistance Nomogram
SupplyVoltage(voltsd.c.)
15
20
25
30
(33)
35Maximum Supply Voltage E
0 100 200 300 400 500 600 700
Loa
dRe
sista
nceL
ine
Supply Voltage
MaximumLoadResistance
forGivenSu
pplyVoltage
Maximum Load Resistance (ohms)
Note: It is recommended that the actual load resistor should
be 50 ohms less than that given by the Nomogram.
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3.5.2 System Connections (Hazardous Area only)
Installation of the meter, the safety barriers, and the customer's signal processing equipment is shown
in Figure 4.4.
Note: Whenever there is disagreement between connection details on the figures dealing with
Hazardous Areas and Certified System Diagrams, the Certified System Diagrams are the authoritative
documents.
Figure 3-5 Electrical Connection Diagram with Standard Electronics to Customers Own Equipment(Hazardous AREAS)
3.6 Post-installation checks
After installation, the following procedure will indicate to a high degree of confidence that the meter
is operating correctly.
Measure the current consumption and the supply voltage at the meter amplifier. This should be within
the limits:
15.5 to 33Vdc, 17mA 1mA (Safe Areas)
15.5 to 21.5Vdc, 17mA 1mA (Hazardous Areas)
With the meter empty, clean and dry, measure the periodic time of the output signal and check that it
is as specified on the meter calibration certificate (air check), to within the limits given in the table
below.
For installation of the CSA certified unit in a hazardous area, refer to Appendix H.
For installation of the ATEX certified unit in a hazardous area, refer to the appropriate safety
instructions booklet shipped with your unit (also available at www.micromotion.com).
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Meter type Air check limit at 20C Added temperature effect
7835 60 ns 10 ns/ C
7845/47 60 ns 300 ns/ C
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Chapter 4Electrical Connections (Advanced)
4.1 General
This chapter describes the electrical installation of the 7835 and the 7845/7847 Liquid Density
Meters when fitted with the Advanced electronics option.
The first sections of this chapter address the installation and configuration of the Advanced
Baseboard, and the later sections concern the Advanced option boards. Further details about the
installation of the Remote Display are given in theMicro Motion 7835/45/47 liquid density meter
Configuration and Use Manual.
4.2 MID (2004/22/EC) Requirements (7835/7845 Only)
To comply with the MID (2004/22/EC) directive:
The digital communication (Modbus and HART) must be disconnected during operational use.
It can only be used for commissioning and maintenance. Unused cable ports must be sealed with suitably rated blanking plugs.
After commissioning or maintenance of the meter, you must seal the enclosure cover to secure
legally relevant parameters from unauthorized modification.
See Section 4.2.1 for more information on securing the meter from unauthorized access to the
meter controls.
Baseboard
Option board Remote Display7965DISPLAY
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4.2.1 Securing the meter for MID
To seal the meter from unauthorized access after commissioning or maintenance, Micro Motion has
provided additional holes on the electronics housing cover to attach a locking wire to the transmitter
cover. The securing component must bear the mark as laid down by the national inspection authority.
Figure 4-1 illustrates the suggested method for sealing the meter.
Note: When installing the meter in a MID measuring system, you must consider the method in which
the system will be verified to meet MID requirements. This method may impact the design of the
measurement system, and we recommend you involve the national inspection authority early in the
design process.
Figure 4-1 MID seal method
Stainless steel locking wire (supplied by MID inspector)
Bonding crimp (supplied by MID inspector)
Use hole in screw(s) to attach locking wire
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4.3 Planning an Electrical Installation
When planning the electrical installation of an Advanced unit, it is important to consider the points
given below.
4.4 Electrical installation in safe areas
All connections to the baseboard are made to terminals 1 to 12 of the terminal block PL2 as shown in
Figure 4-2.
Safety Electrical installation in hazardous areas requires strict adherence to local codes of practice. For installation of the CSA certified unit in a hazardous area, refer to Appendix H. For installation of the ATEX certified unit in a hazardous area, refer to the appropriate safetyinstructions booklet (available at www.micromotion.com).
Power supply The Advanced electronics operate from a nominal 24V supply, but will operate from anysupply in the range 9.5V to 28V, measured at the supply terminals on the baseboard.
The output circuits on the baseboard are all loop-powered and are isolated from the maincircuit. If required, the main circuit and the output circuits can be powered from a commonpower supply.
When selecting a suitable power supply voltage, you must take into account voltage dropscaused by the connecting cable (see below) and in hazardous areas, across zener barriers orgalvanic isolators.
Groundconnections
The earthing pads on the baseboard must make good contact with the meter case via the M3
bolts. If a HARToption board is used, the indicated earthing point must make good contact withthe baseboard earthing points.
The 0V power supply lead should be earthed at the supply end, or at the safety barriers ifapplicable.
Cable parameters Where long cable lengths are required the cable resistance may be significant. Whenoperating from a 24V supply in safe areas the following limits apply:- Maximum line resistance ()
- Power supply 260- Remote Display 60- Outputs 500
For further details relating to the maximum line resistance, please refer to Appendix D. When calculating the maximum cable lengths please note that the current loop is 2 times thecable length, and so the cable resistance is given by: 2 x (dc resistance per unit length) x
(cable length). Typical cables would comply with BS5308 Type 1 or 2.
EMC To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that themeter be connected using a suitable instrumentation cable. The instrumentation cable shouldhave individual screen(s), foil or braid over each twisted pair and an overall screen to cover allcores. Where permissible, the overall screen should be connected to earth at both ends(360 bonded at both ends). The inner individual screen(s) should be connected at onlyone end, the controller (e.g. signal converter) end.
Note that for intrinsic safety, termination of the inner individual screen(s) to earth in thehazardous area is NOT generally permitted.
Metal cable glands should be used where the cables enter the meter amplifier box. Unusedcable ports should be fitted with metal blanking plugs.
When the 78452 (Advanced Remote Amplifier) is used, the ferrite ring, which is supplied,must be fitted around the connecting cable. For installation in hazardous areas, refer to thecertified system drawings in Appendix H, and the safety instruction booklet that came with themeter (also available at www.micromotion.com) .
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30 Micro Motion 7835/45/47 Liquid Density Meters
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Figure 4-2 Baseboard Layout
Note: There is no reason to remove the baseboard under normal circumstances. If it is removed,
however, care should be taken, when replacing the board, to push it firmly against the foam strip, as
this helps to prevent the board from excessive flexing.
Figure 4-3 shows a schematic representation of the electrical connection diagram for the Advanced
Baseboard and Remote Display in safe areas. In this example, the pulse output is shown driving an
alarm device such as a relay.
Analog 1
An al og 2
Alarm
22mA
2mA
Alarm
22m A
2mA
OPTIONAL
BOARD PL1
PL2
P/U1
P/U2
0V
PRT -
SIG -
SIG +
PRT +
DRIVE
PULSE 1+
-
ANALOG 1+
-
SUPPLY +
0V
-
+
A
B
DISPLAY
Earthing Point
Earthing Point
ANALOG 2+
-
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
Jumper Links Foam support strip
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Figure 4-3 Connection Diagram (Safe areas)
4.4.1 Electrical Installation with Signal Converter
Figure 4-4 shows a typical electrical connection diagram for use in safe areas using signal converters.
Analog
Output
+16V to 28V
500 MAX
0V
Pulse
Cable Screen 1
0V Power 2
+ve Power 3
A 4
B 5
Remote
Display
Analog
Output
(as above)
1 +
2 - }
8 -
7 +
9.5V to 28V dc
Power Supply
12 B
11 A
10 +
9 -
+_
}
}
4 -
3 +
5 +
6 -}
}
Remote
Display
Analog 1
Analog 2
Supply
+5V to 28V
Pulse
Output
Advanced
DensityBaseboard
PL2 Connections
0V
Load500 minimum1000 typical
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32 Micro Motion 7835/45/47 Liquid Density Meters
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Figure 4-4 Electrical connection diagram when using a signal converter (Safe area)
4.5 Electrical installation in hazardous areas
When used in hazardous areas, safety barriers MUST be interposed between the meter and the signal
processing equipment. Some of the safety barriers are unsuitable for certain installations, as discussed
below.
4.5.1 Safety Barrier and Galvanic Isolator Selection
Power Supply (PL2 terminals 7 and 8)
As a general rule, the IIB safety barrier should be used where possible as this allows the maximum
power to the meter, facilitating a wide range of installations and system configurations.
Where the installation requires the IIC safety barrier, it is important to check that sufficient power is
available to power the meter and all of the options. The table below summarizes the maximum line
resistances allowable for the main system configurations assuming a 24V supply and a minimum of
9.5V available at the supply terminals on the baseboard.
For installation of the CSA certified unit in a hazardous area, refer to Appendix H.
For installation of the ATEX certified unit in a hazardous area, refer to the appropriate
safety instructions booklet shipped with the unit (also available at www.micromotion.com).
1 1000 + Density Pwr
2
+ Density Input
- Density Pw r
- Density Input
+ Analog Input
SEE FLOW
COMPUTER/
SIGNAL
CONVERTER
HANDBOOK
FOR
CONNECTION
DETAILS
3
4
(5)
(6)
+ Density Pwr
- Density Pwr
- Analog Input
+Density Pwr
- Density Pwr
Power Supply
Analog 1 (Analog 2)
Freq/Alarm+VE
-VE
+VE
-VE
+VE
-VE
7
8
7835/45/47 with advancedelectronics
7950/51
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Zener Safety Barriers
Power to the main circuit may be obtained through a simple 164 barrier or two 300 28V barriersin parallel for IIB applications, or through a single 234 28V barrier in IIC applications.
The main characteristics of the safety barriers are given in Table 4-2. Using this information and the
information given in Table 4-1, the most suitable barriers for a particular application can be
ascertained.
Note: The power supply input is protected internally by an 8.2V5% clamp diode and a 1resistor.
This limits the maximum current that can flow into the device:
For example, if two 28V, 300 barriers are used in parallel, the effective resistance is 150.
The maximum current is:
Imax = = 134mA
and not 185mA, as might be expected if the input protection diode was not present.
Galvanic Isolators
Galvanic isolators are suitable for powering the main board in IIB applications, but are NOT suitable
for powering the main board in IIC applications. Also, IIC isolators are not suitable for use when
Modbus communications are required.
The main characteristics of the galvanic isolators are given here. Using this information and the
information given in the table above, the most suitable galvanic isolators for a particular application
can be ascertained.
Table 4-1 Maximum line resistances for main system configurations
Advanced System combinationMaximum line resistance ()(barrier + cable)
Baseboard 340
Baseboard + remote display 260
Baseboard + locally powered remote display 280
Baseboard + HARTboard 270
Baseboard + HART+ display 250
Table 4-2 Safety barrier characteristics
Example Type Group Safety Description () Max. resistance ()
MTL 729P IIB 164 184
MTL 728P IIC 234 253
P&F Z728H IIC 240 250
Imax =Maximum voltage from barrier- Minimum voltage at input
Minimum resistance of barrier/input combination
( )1150
95.02.828
+
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34 Micro Motion 7835/45/47 Liquid Density Meters
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Analog (4 to 20mA) outputs including HART
(PL2 terminals 3 & 4, 5 & 6 and HART PL3 3 & 4)
Any of the zener safety barriers listed on the system certificates are suitable for operation with the
Advanced Density analog outputs. Some galvanic isolators may not be capable of driving the 2mA
and 22mA out-of-range alarm states available on the Advanced Density system; for details please
check with the barrier supplier.
Pulse output
(PL2 terminals 1 & 2)
The pulse output can be configured to output either a status / alarm signal or the resonant frequency of
the density meter; the latter requires the safety barrier to have a bandwidth of at least 1 kHz.
The table below indicates which galvanic isolators may be used for frequency-configured pulse
output; zener barriers may be used for either configuration.
4.5.2 Electrical connections in a hazardous area
Table 4-3 Galvanic isolator characteristics
Example Type Group Max output impedance ()
MTL 3022 IIB 165P&F KFD2-SD-Ex1.36 IIB 160
P&F KFD2-SL-Ex1.36 IIB 160
MTL 5022 IIB 143
Table 4-4 Pulse output configurations
Example Type Output description Pulse output configuration
MTL3011 Relay Status / alarm
MTL3012 Solid state (dc to 2kHz) All
MTL4013 Solid state (dc to 5kHz) All
MTL4014 Relay Status / alarm
MTL5011 Relay Status / alarm
MTL5016 Relay Status / alarm
MTL5017 Relay Status / alarm
Table 4-5 Electrical connections in a hazardous area
Drawing Reference Description
Advanced Electronics, HART, MODBUS, and Zener Barrier(Gas Groups A, B, C and D)
Advanced Electronics, HART, MODBUS, Remote Display, Zener Barrier(Gas Groups A, B, C, and D)
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Figure 4-5 Electrical connection diagram when using Advanced Electronics, HART, MODBUS, andZener Barrier in a Hazardous Area (Gas Groups A, B, C and D)
Advanced Electronics with HART Multi-drop, and Zener Barrier(Gas Groups C and D)
Advanced Electronics with HART Multi-drop, Remote Display, Zener Barrier
(Gas Groups C and D)
Electronics with HART Multi-drop, Remote Display, Galvanic Isolator(Gas Groups C and D)
Table 4-5 Electrical connections in a hazardous area
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Figure 4-7 Electrical connection diagram when using Advanced Electronics with HART Multi-drop,and Zener Barrier in a Hazardous Area (Gas Groups C and D)
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38 Micro Motion 7835/45/47 Liquid Density Meters
Electrical Connections (Advanced)
Figure 4-8 Electrical connection diagram when using Advanced Electronics with HART Multi-drop,Remote Display, and Zener Barrier in a Hazardous Area (Gas Groups C and D)
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Figure 4-9 Electronics with HART Multi-drop, Remote Display, and Galvanic Isolator in a HazardousArea (Gas Groups C and D)
4.6 Baseboard Configuration
The baseboard is supplied with one of the following two software versions:
General software version - normally used in the food and process industries.
Fiscal software version - normally used in Crude oil or refined petroleum applications.
The only difference between the two software versions is the available calculations.
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Irrespective of which software version is running, when the unit is received from the factory, it is
pre-configured to output the following signals:
For many applications, the factory default configuration described above will be quite acceptable.
However, if any of the additional calculated parameters or different output ranges are required, then a
simple Baseboard re-configuration can be performed using a Remote Display, or PC.
4.7 Baseboard plus HART Option Board
The HART option board connects with the Baseboard using the 40-way connector provided and
supported by two plastic posts. A tag is provided for connecting to the chassis earth point on the
Baseboard.
The HART option board is a loop-powered 4-20mA output which can support HART
communications or can be used to provide a third analog output. The unit is always designated as a
HART slave unit, i.e. it only communicates when it receives a message asking it to do so.
For HART communications, the option board output is regarded as the primary output, and the
baseboard outputs as the secondary and tertiary outputs.
4.7.1 Electrical Installation for HART Communications
For safe area installations, electrical connections to the HART option board are shown in
Figure 4-10.
In safe areas, up to 15 HART slave units may be installed on one HART communication link. They
should be attached in parallel across the two points indicated as X and Y in Figure 4-10. If more than
one HART Advanced unit is installed on a single HART communication link, each unit must be
given a unique HART slave address in the range 1 to 15. Whenever the HART address is set to a
non-zero value, the output current is automatically set at 4 mA.
Output Output Parameter
Analog 1 (4-20mA) Line density (700 to 1000 kg/m)
Analog 2 (4-20mA) Temperature (0 to 100C)
Pulse output Frequency (default)Alarm: Untriggered High (default)
For installation of the CSA certified unit in a hazardous area, refer to Appendix H.
For installation of the ATEX certified unit in a hazardous area, refer to the appropriate safety
instructions booklet shipped with your unit (also available at www.micromotion.com).
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Figure 4-10 HART Option Board Electrical Connection Diagram
4.8 Advanced Density Post-Installation Checks
After installation, the following procedure will indicate to a high degree of confidence that the meter
and Advanced system is operating correctly.
1. Measure the supply voltage at the meter amplifier (PL2, pins 7 and 8). This voltage should be
within the limits of 9.5 to 24Vdc in safe areas and 9.5 to 20Vdc in hazardous areas. In safe
areas, the current to the baseboard should not exceed 80mA.
2. With the meter empty, clean and dry, measure the periodic time of the output signal and check
that it is as specified on the meter calibration certificate (air check), to within the limits given
in the table below.
Meter type Air check limit at 20 C Added temperature effect
7835 60 ns 10 ns / C
7845/47 60 ns 300 ns / C
Hand Held
Communicator
An alogue +
Analogue -
HCC
HCC
HART
Option Board
Slave Device
Power Supply
Master
HART
Device
Network
Resistance
230 to 500
X
Y
1
2
3
4
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Electrical Connections (Advanced)
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Chapter 5Electrical Connections (Entrained Gas Option)
5.1 General
This chapter concerns the operation of 7845/47 liquid density meters when fitted with the Standard
Entrained Gas amplifier.
5.2 Ground Connections
The earthing pads on the mounting face of the amplifier unit MUST make good contact with the
meter case by the M3 cage nuts. The external earth bonding point of the meter is located inside the
maintaining amplifier housing. The meter should be grounded via the pipework.
The 0V power supply lead should be earthed at the supply end, or at the safety barriers if applicable.
5.3 Use with Signal Converters
The 7845/47 E.G. Liquid Density Meter (with Standard Electronics)/signal converter system can only
be operated in SAFE AREAS.
5.3.1 System Connections
The density system connections are illustrated in Figure 5-1 below.
7845/47 Entrained Gas Liquid Density Meters with Standard Electronics are NOT intrinsically
safe.
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Figure 5-1 Electrical connection diagram (7945/47 E.G. to Signal Converters)
5.4 Use with Customers Own Equipment
5.4.1 System Connections for Safe Areas
Power supply to Density Meter: 15.5 V to 33 V d.c., 25 mA min.
Power supply to RTD: 5 mA max.
The frequency at which the meter is operating can be detected by using a series resistor in the +VE
power line. The value of resistance to be used for a given supply voltage must not exceed the value
obtained from the LOAD NOMOGRAM (Figure 5-2). The electrical connections to be made are
shown in Figure 5-3.
7845/47 Entrained Gas Liquid Density Meters with Standard Electronics are NOT intrinsically
safe.
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Electrical Connections (Entrained Gas Option)
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Figure 5-2 Load Resistance Nomogram
Figure 5-3 Electrical Connection Diagram 7845/47 E.G. to Customers Own Equipment (SAFEAREAS)
7845/47 E.G.
PRT
1
2
3
4
5
6
See Note
POWER +VE
SIGNAL +VE
POWER -VE
SIGNAL -VE
PRT SUPPLY +VE
PRT SIGNAL
PRT SUPPLY -VE
RPOS +
NEG -
SIG
Note: See Load Nomogram (Figure 5.2) to determine R value.
1F
1F
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Electrical Connections (Entrained Gas Option)
5.5 Post-Installation Checks
After installation, the following procedure will indicate that, to a high degree of confidence, the meter
is operating correctly.
1. Measure the current consumption and the supply voltage at the meter amplifier. This should be
within the limits:
15.5V to 33V d.c.
75mA 10mA
With the meter empty, clean and dry, measure the periodic time of the output signal and check that it
is as specified on the meter calibration certificate (air check), to within acceptable limits (e.g. 500ns),
after making allowances for different ambient conditions.
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Chapter 6Calibration and Performance
6.1 General
The 7835/45/47 liquid density meters (including Entrained Gas versions) are calibrated at the factory,
and are supplied with their own test and calibration certificates.
The calibration certificate specifies various calibration constants that allow the user to convert the
output periodic time signal from the meter into a density value. (See Appendix E for specimen
calibration certificates.)
6.1.1 For Standard Electronics Units
For units with Standard electronics, the calibration constants will need to be programmed into a signal
processing instrument such as a signal converter. Density calculations are performed on the signal
processing instrument.
6.1.2 For Advanced Electronics Units
For units with Advanced electronics, the calibration constants are pre-programmed into the
electronics and normally require no further consideration. The calculations in this chapter areperformed by the electronics on the meter.
Important Information
If you have obtained a replacement calibration certificate for an Advanced Electronics unit, the set of
pressure coefficient constants K20A, K20B, K21A and K21B that fall within your operating pressure
range can be programmed into the Advanced Electronics using ADView or ProLink II software
(downloadable from web sites listed on the back page).
(If your operating pressure range falls between two of the sets of operating pressure ranges on the new
certificate, contact the factory for a new calibration certificate.)
The Advanced Electronics keeps a write-protected copy and a working copy of all coefficients. The
integrity of the working coefficients is safe, and so for simplicity it is recommended that the working
coefficients only be changed. This is achieved by writing to registers 131 and 132. (See Chapter 8 for
a guide to using ADView or ProLink II.)
Alternatively, a new FRAM memory chip can be issued which holds the calibration coefficients.
However, in replacing the FRAM device some user configured data may be lost (e.g. upper and lower
limits on the analog outputs, matrix referral points, special function, user defined line pressure etc.).
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6.2 Interpretation of calibration certificate
6.2.1 General density equation
The basic meter constants, K0, K1, and K2 are computed from the factory calibration on three fluids.Using these constants and the general density equation, the density of the liquid within the meter can
be calculated.
It is stated on the calibration certificate that the basic constants are determined from a calibration at atemperature of 20 C (68 F) and at a pressure of 1 bar (14.5 psi). If the operating conditions of themeter differ from that of the calibration conditions, a correction to the density calculated using the
general equation is required.
6.2.2 Temperature correction
If the meter operates at temperatures other than 20 C (68 F), a correction to the density calculatedusing equation (1) must be made using the temperature coefficient data given on the calibration
certificate.
6.2.3 Pressure correction
The meter design has a unique facility to reduce the influence of the line pressure on the density
measurement but there is a residual effect for which correction may be required. This residual
pressure effect before a pressure correction is illustrated for the 7835/45/47 meter in the following
figures.
The general density eq
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