hart field device specification...hart protocol host device for full communication capability. this...

HART Field Device Specification

PRI 150

Document Number : TD0009

Revision : F

Date : 04/02/2014

REVISION STATUS

SIGNED / DATED

F Added description of hardware write protection

E. Sanchez 03/02/14

S Roe

04/02/14

P Featonby

04/02/14

E Version 11 – See CD1012 S. Roe 23/09/2011

E. Sanchez 03/10/11

A. Jones 03/10/11

D Version 10 information added R. Field A. Jones P. Featonby

C Version 8 Information added R. Field A. Jones P. Featonby

B Name Changed to Tracerco & Drawings R. Field A. Jones K. James

A Minor Changes R. Field A. Jones K. James

0 Original issue

R. Field A. Jones K. James

REV REVISION DESCRIPTION AUTHOR CHECKED APPROVED

Pavilion 11, Coxwold Way Belasis Hall Technology Park Billingham, Cleveland TS23 4EA

Pavilion 11, Coxwold Way Belasis Hall Tech Park Billingham, Cleveland TS23 4EA

Title: PRI 150 Hart 5.1 Specification

Page: 2 of 50 Date: 04/02/2014

PRI 150 HART Field Device Specification

Table of Contents 1 Introduction ................................................................................................................................ 5

1.1 Purpose .................................................................................................................................. 5

1.2 Who should use this document? ............................................................................................. 5

1.3 Abbreviation and Definitions ................................................................................................... 5

1.4 References ............................................................................................................................. 5

2 Device Identification ................................................................................................................... 6

3 Product Overview ....................................................................................................................... 7

4 Product Interfaces ...................................................................................................................... 8

4.1 Process Interfaces .................................................................................................................. 8

4.1.1 Sensor Input Channels ................................................................................................ 8

4.2 Host Interface ......................................................................................................................... 8

4.2.1 Analogue Output 1: Process Level ............................................................................... 8

4.2.2 Linear Over Range ...................................................................................................... 9

4.2.3 Restricted Range Limit ................................................................................................. 9

4.3 Local Interfaces, Jumpers and Switches................................................................................. 9

5 Device Variables ...................................................................................................................... 10

6 Dynamic Variables ................................................................................................................... 10

7 Status Information .................................................................................................................... 11

7.1 Field Device Status .............................................................................................................. 11

7.2 Extended Field Device Status ............................................................................................... 11

7.2.1 Error & Warning Reporting ......................................................................................... 12

7.2.2 Mode Indication ......................................................................................................... 13

7.2.3 Reporting Error Conditions ......................................................................................... 14

7.3 Command #48 - Additional Device Status ............................................................................ 15

8 Universal Commands ............................................................................................................... 17

9 Common Practice Commands ................................................................................................. 18

9.1 Supported Common Practice Commands ............................................................................. 18

9.2 Burst Mode ........................................................................................................................... 18

9.3 Catch Device Variable .......................................................................................................... 18

10 Device Specific Commands .................................................................................................. 19

10.1 Public Device Specific Commands ....................................................................................... 20

10.1.1 Command #128 Read Date and Time ........................................................................ 20

10.1.2 Command #129 Write Date and Time ........................................................................ 20

10.1.3 Command #130 Read Calibration Source Information ............................................... 21

2



Page: 3 of 50 Date: 04/02/2014

10.1.4 Command #131 Write Calibration Source Information ............................................... 22

10.1.5 Command #132 Read Calibration Counts #1 ............................................................. 23

10.1.6 Command #133 Write Calibration Counts #1 ............................................................. 23

10.1.7 Command #134 Read Calibration Counts #2 ............................................................. 24

10.1.8 Command #135 Write Calibration Counts #2 ............................................................. 25

10.1.9 Command #136 Read Damping Information .............................................................. 26

10.1.10 Command #137 Write Damping Information ........................................................... 27

10.1.11 Command #138 Read Timed Count Information .................................................... 28

10.1.12 Command #139 Start Timed Count ........................................................................ 28

10.1.13 Command #140 Read Tabular Linearisation Number of co-ordinates ..................... 29

10.1.14 Command #141 Write Tabular Linearisation Number of co-ordinates ..................... 30

10.1.15 Command #142 Read Co-ordinate ......................................................................... 30

10.1.16 Command #143 Write Co-ordinate ......................................................................... 31

10.1.17 Command #144 Read Fill Level ............................................................................. 32

10.1.18 Command #145 Write Fill Level .............................................................................. 32

10.1.19 Command #146 Read Fail Information ................................................................... 33

10.1.20 Command #147 Write Fail Information ................................................................... 33

10.1.21 Command #148 Read Pressure Correction Information ......................................... 34

10.1.22 Command #149 Write Pressure Correction Information ......................................... 35

10.1.23 Command #150 Read External Pressure ............................................................... 36

10.1.24 Command #151 Write External Pressure ............................................................... 36

10.1.25 Command #152 Read GM Configuration ................................................................ 37

10.1.26 Command #153 Read Write Protect Status ............................................................ 37

10.1.27 Command #154 Set Write Protect Status ............................................................... 37

10.1.28 Command #155 Read Battery Voltage ................................................................... 38

10.1.29 Command #160 Read Range Configurations ......................................................... 38

10.1.30 Command #161 Write Range Configurations ......................................................... 39

10.1.31 Command #175 Read Update Interval ................................................................... 39

10.1.32 Command #176 Write Update Interval .................................................................... 40

10.1.33 Command #177 Read GM Count Totals ................................................................. 40

10.2 Non-Public Device Specific Commands................................................................................ 41

11 Tables .................................................................................................................................. 42

11.1 Manufacturer Specific Definitions ......................................................................................... 42

11.2 Source Type Codes .............................................................................................................. 42

11.3 Damping Type Codes ........................................................................................................... 42

11.4 Counting Type Codes ........................................................................................................... 42

11.5 Device Variable Code Table ................................................................................................. 42

11.6 Range Limit Codes ............................................................................................................... 42

3



Page: 4 of 50 Date: 04/02/2014

11.7 Write Protect Codes ............................................................................................................. 42

12 Performance ......................................................................................................................... 43

12.1 Sampling Rates .................................................................................................................... 43

12.2 Power Up ............................................................................................................................. 43

12.3 Device Reset ........................................................................................................................ 43

12.4 Self Test ............................................................................................................................... 43

12.5 Command Response Delay .................................................................................................. 44

12.6 Busy and Delayed Response ............................................................................................... 44

12.7 Long Messages .................................................................................................................... 44

12.8 Non-Volatile Memory ............................................................................................................ 44

12.9 Operating Modes .................................................................................................................. 44

12.9.1 Fixed Current Mode ................................................................................................... 44

12.9.2 Pressure Compensation ............................................................................................ 44

12.9.3 Damping Mode .......................................................................................................... 45

12.10 Linearisation Mode ........................................................................................................ 45

12.11 Write Protection ............................................................................................................. 45

13 Non-Hart Information ............................................................................................................ 46

14 Appendix A - Hart Capability Specification ............................................................................ 47

15 Appendix B - Default Configuration ....................................................................................... 48

16 Appendix C - Revision History .............................................................................................. 49

16.1 Release Ver A ...................................................................................................................... 49

16.2 Release Ver B ...................................................................................................................... 49

16.3 Release Ver C ...................................................................................................................... 49

16.4 Release Ver D ...................................................................................................................... 49

16.5 Release Ver E ...................................................................................................................... 49

16.6 Release Ver F ...................................................................................................................... 50

4



Page: 5 of 50 Date: 04/02/2014

1 Introduction

The PRI 150 Nucleonic Level gauge commercially known as the "TracercoTM SmartGauge", complies with HART Protocol Revision 5.1. This document specifies all the device specific, common and universal features used in the device. It details the HART protocol details of commands, units and general operation. The outline of the instrument is sufficient to configure a HART protocol host device for full communication capability.

This document is not written as an installation or operation manual. It is not intended as an instruction manual for the operation of a computer or hand held calibrator software.

1.1 Purpose The purpose of the document is to outline specifically the commands and functionality of the field device with respect to the HART protocol. Together with the installation and operation manual it provides a complete, unambiguous description of the TracercoTM SmartGauge device

1.2 Who should use this document?

This is a technical document for developers, system integrators and people who are familiar with the HART 5.1 protocol. Field, installation and plant engineers are not expected to understand this document. It contains the information necessary to test and communicate with the field device.

1.3 Abbreviation and Definitions

GM Geiger Muller Tube.

CN Capacitance Number.

S, P & D Detector configuration for Single, Pressure and Dual respectively

CPS Counts Per Second

NVRAM Non Volatile Random Access Memory

1.4 References

• HART 5.1 Specification documents.

Author - HART Communication Foundation

Document Id - HCF_SPEC-99, HCF_SPEC-127 and HCF_SPEC-151.

• TracercoTM SmartGauge Installation and Operation manual.

Author - Tracerco

Document Id - MD0010

• Drawing Number DD30592 - PRI 150 Level Gauge System Diagram

Author - Tracerco

Document Id - DD30592

5



Page: 6 of 50 Date: 04/02/2014

2 Device Identification

Listed below are the HART device information, drawing and labels marking the device.

Table 1 - HART Device Information. Manufacturer Name: Tracerco Model Name(s): PRI 150–A–4

Manufacturer ID code:

174 (AE Hex) Device Type Code 127 (7F Hex)

HART Protocol: Revision

5 Device Revision: 3

Number of Device: Variables

42 Hardware Revision: 0

Physical Layers: Supported

FSK only Software Revision 11

Notes: None Physical Device: Category

Current Output and Transmitter.

Figure 1 - Device Drawing & General Label

Figure 2 - Intrinsically Safe Device Label The device may be used as an intrinsically safe instrument, in such cases the label on the left will be present on the device.

TRACERCO SmartGauge

PRI 1

50 -

A -4

TM

TRACERCO

6



Page: 7 of 50 Date: 04/02/2014

3 Product Overview

The PRI 150 TracercoTM SmartGauge is a non-intrusive nucleonic level gauge used in the petro-chemical industry. It uses a radiation source that can be mounted externally or internally in a vessel with the use of a dip pipe, the dip pipe has the source located at the end of the dip pipe. Figure 3 shows a general arrangement diagram for the external source variation. It measures the level of liquids, solids or gases in the vessel with respect to its measurement span.

Figure 3 - General Arrangements

A radioactive source is housed in a lead filled container, which emits a collimated beam of radiation. When the vessel is empty this penetrates the vessel wall, across the inside of the vessel through the other wall and is incident upon the vertical detector.

As the level of liquid in the vessel rises above the minimum, it attenuates the radiation over an increasing length of the detector. This causes a decreasing pulse rate to be produced by the PRI 150 detector, which is then converted into a 4-20 mA (or other) output signal within the PRI 150 detector by the HARTTM digital Interface. The PRI 150 incorporates many advanced features to enable accurate and reliable level detection, including;

• Automatic correction for radioactive source decay,

• Automatic correction for changes in vessel operating pressure,

• Linear, table and logarithmic linearisation options for level correction,

• Extensive self-checking and error reporting facilities,

• HARTTM Digital Interface.

7



Page: 8 of 50 Date: 04/02/2014

4 Product Interfaces

4.1 Process Interfaces The PRI 150 TracercoTM SmartGauge uses an array of Geiger Muller Tubes (GM) to produce a level measurement.

4.1.1 Sensor Input Channels

Pressure correction may be used in calculating the level measurement. Pressure correction can be enabled using device specific commands. Two methods are used to correct for pressure variations.

4.1.1.1 Internal Pressure Correction An internal GM is used to calculate the pressure variations in the vessel, it uses this value to produce the pressure variations. Then compensates for the changes in density and level due to pressure.

If internal pressure correction is used then internal GM's are used to calculate pressure variations. These two tubes are always located at the top of the array and are configured automatically when internal pressure correction is selected.

4.1.1.2 External Pressure Correction If external pressure correction is used, a register is provided for an external pressure gauge to measure the changes in the vessel's pressure. It then compensates for the changes in density and level due to pressure, using the externally calculated pressure value.

4.2 Host Interface 4.2.1 Analogue Output 1: Process Level

The three wire 4-20mA current loop is connected to a three wires interface connector marked 1, 2 and 3. This unit must be used with an MTL barrier 5042, the barrier has a connector marked 1, 2 and 3 that corresponds to the wiring of the device. Please refer to the Installation Manual and drawing DD30592 for hook up details.

This is the only output from the transmitter, representing the process temperature measurement, linearised and scaled according to the configured range of the instrument. The output corresponds to the Primary Variable.

HART communication is supported on this loop. This device has a CN number of 1 (5nF).

A guaranteed linear over-range is provided. Device malfunction can be indicated by down scale or up-scale current. The direction and value is selectable by the user, see section 10.1 for details.

8



Page: 9 of 50 Date: 04/02/2014

Public Device Specific Commands

This device adheres to the NAMUR standard.

• Measurement Valid from 3.8mA to 20.5mA

• Fault indicated by <= 3.6mA or >= 21mA

4.2.2 Linear Over Range

Direction Values (percent of range)

Values (mA or V)

Linear over-range* Down -3.06% to -1.31% 3.51mA to 3.79mA

UP 103.19% to 105% 20.51mA to 20.8mA

Device Malfunction indication

Down: less than -3.06% 3.51mA

UP: greater than 106.25% 21.0mA

Maximum current 109.38% 21.5mA

Multi-Drop current draw 26mA

Lift-off voltage 15 V

*Linear over-range represents the saturated output and is unrepresentative of the process level.

4.2.3 Restricted Range Limit

In normal operation the range limits are as in as in section 4.2.2, with over range and saturation ranges. In some circumstances the end user requires the loop current levels not to go over the 4-20mA limits unless a fault condition occurs. Using command #160 & #161 the range limit code can be set to limit the range to ≥ 4mA and ≤ 20mA. All other functions for status bytes etc. are the same; it is just the loop current that is limited.

4.3 Local Interfaces, Jumpers and Switches Four links are available on the PCB for various functions.

LK1 ) Erase battery backed memory (A normally closed link). Removing the link and powering down the unit will erase the memory and thus all configuration settings.

LK2 ) Enable external EPROM (A normally open link). Not recommended for use, internal settings. Always leave unclosed.

LK3 ) Enable external EPROM chip-select (A normally open link). Not recommended for use, internal settings. Always leave unclosed.

PL4) Write Protect - Pins 1 and 2 have a header which when closed will write protect the software settings on in the PRI 150. For additional information see section 12.11.

9



Page: 10 of 50 Date: 04/02/2014

5 Device Variables

The device contains the following device variables.

Table 2 - Device Variables

Number Name Classification Unit Codes: 0 Level with respect to instrument span Analytical Percent (57)

1 Source strength Analytical Percent (57)

2 Damped total count rates Analytical Counts Per Second

3 Damped top Stage Count Rates Analytical Counts Per Second

4 One Second update counter Analytical Seconds

5 Update Counter Analytical Not Used 250

6-23 Channel 1-18 Raw Count Rate Analytical Counts Per Second

24-41 Channel 1-18 Peak Count Rate Analytical Counts Per Second

42 Pressure / Temperature Correction Analytical Variable - Dependant on selected units.

Note:

The Raw Count rates are the unprocessed count rates sampled over 1 second.

The Peak Count rates are reset when read, however they are non-volatile.

6 Dynamic Variables

Two dynamic variables are implemented.

NAME DESCRIPTION UNITS

PV Level The levels of the particular process with respect to instrument span.

Percent

SV Level Top Stage level as a separate level indication Percent

The PV level is produced with respect to the length of the array of GM's within the instrument, the span of the instrument.

The PV & SV is smoothed using the smoothing values Fixed and Dynamic (Normal and Fast) values.

10



Page: 11 of 50 Date: 04/02/2014

7 Status Information

7.1 Field Device Status

• Bit #0 ("Primary Variable out of Limits") When the process conditions have sent the Primary variable and Loop current into saturation. This does not include fixed output modes. i.e. when the output is no longer representative of the level.

The implementation must be to the Sensor limits not the Range limits.

• Bit #1 ("Non-Primary Variable out of Limits") Same as above but another process Variable.

• Bit #2 ("Analogue Output Saturated") When the process conditions have sent the Primary variable and Loop current into saturation. This does not include fixed output modes. i.e. when the output is no longer representative of the level.

The implementation must be to the Range limits not the Sensor limits.

• Bit #3 ("Analogue Output Fixed") is set for commands 40, 45, 46 or when the device is in error mode. Any condition where the Loop Current is fixed until a suitable command is sent or error condition cleared, requires this bit to be set.

• Bit #4 ("More Status Available") is set whenever any failure or warning is detected. Command #48 gives further detail. (See Section 7.2)

• Bit #5 ("Cold Start") See Section 7.2.

• Bit #6 ("Configuration Changed") is set whenever a write command is sent or on reset / power up. Unless the configuration of the device can be guaranteed as being that same as before the reset / power down event, this bit must be set

• Bit #7 ("Field Device Malfunction") is set when any failure error is detected, or when the measurements provided are not accurate. Command #48 gives further detail. (See Section 7.2)

7.2 Extended Field Device Status The field device is made up of an array of GM tubes in order to produce a level. These are configurable as either single or dual GM's in a line. One or more of these GM's could fail and each GM failure has certain an effect on the operation of the level. See Figure 4 - GM Configurations, for an explanation of types

The three variants D, S and P (Double, Single and Pressure respectively) show GM tubes in a 3 stage configuration. Maximum values for each variant of detector are also shown.

11



Page: 12 of 50 Date: 04/02/2014

Figure 4 - GM Configurations

7.2.1 Error & Warning Reporting

On a serious failure or error the loop current is set to an out of range into a Fault current. The two conditions where this happens are if the NVRAM (Device Failure) is corrupted or a stage fails. If a GM or stage fails there are several options for reporting errors. This instrument has controls to set the severity of error and whether or not the loop current is set to a fault condition, as well as what that fault loop current is. See section 7.2.1.1 for details

• Tube Failure: If a single GM fails in a dual (D) detector the other tube in the pair can double its own counts to compensate for the failed GM and report a warning. In an S or P a single failure would also flag a Stage Failure.

• Stage Failure: If a stage fails in a single (S - one GM) or a dual (D - two GM's) then an error is reported unless the stage failure has been set as acceptable. See section 7.2.1.2 for an explanation of acceptable stage failures.

• Internal Pressure Correction Failure: If the first stage in a single, pressure or dual (S, P or D) is using internal pressure correction and fails. Then an error is reported and loop current is put into a fault condition, regardless of the acceptable stage failure settings.

To clear the fault the device must be taken out of Internal Pressure Correction mode, and the tube failure will be seen as a stage failure.

• Device Variable Alert (DVA): Is not used.

3 D Detector

3 S Detector

3 P Detector

Variant MaximumStages

MaximumGM Tubes

DSP 12

149

131418

12



Page: 13 of 50 Date: 04/02/2014

7.2.1.1 GM Fault Condition For a GM to be in fault condition the count rate for that particular tube has to follow the following conditions.

(GM Count Rate < 1 AND (GM Count Rate IsTrue for "Detector Timeout" seconds))

OR (GM Count Rate > Max Count Rate for GM Error).

If a GM is in fault condition then the corresponding Channel Failed bit is set and Channel failed warning is set.

7.2.1.2 Acceptable Stage Failures This parameter allows one or more stages to be in fault condition and only be reported as a warning not an error. The "Acceptable Stage Failures" parameter controls how many failure are allowed before the loop current goes out of range.

If a stage has failed then this condition applies:

If (Number of Stage failures) > (Acceptable Stage Failures) Then

Stage Failed - Unacceptable Error bit is set.

Loop Current = "Stage Error Loop Current"

Else

Stage Failed - Acceptable Error bit is set

End If

The range of allowable Acceptable Stage Failures is as follows:

0 >= Acceptable Stage Failures < Maximum Stages in the particular device.

E.g. The Device is a 9D. Therefore the range of values for Acceptable Stage Failures is 0 to 8

7.2.2 Mode Indication

There are several modes for various settings. These are grouped in mutually exclusive groups as outlined below.

1. Fixed Smoothing / Dynamic Smoothing.

2. No Pressure / External Pressure / Internal Pressure correction.

3. Simple / Look Up Table / Logarithmic Linearisation

Simulation mode bit is set when the counts for all GM's are being simulated. Error bit is set to show the device is not functioning correctly.

13



Page: 14 of 50 Date: 04/02/2014

7.2.3 Reporting Error Conditions

Error conditions are when the device is not functioning properly and the output is no longer representative of the input conditions. The functionality is handled by Command #146 10.1.19 and command #147 10.1.20. Below is a description of the settings for the PRI 150 only. Parameter Value Description Continuous Zero Count Time

1-256 sec The time over which a continuous zero count is detected, this signifies a faulty GM. When this occurs a failure must be reported.

Device Failure Current

2-22 mA Any device failure will cause the current output to go to a fixed output value (Device failure current). This value is user selectable within the limits. Note: This may be within the operating range if required.

Device Failure Current

0mA This setting allows output current to stay fixed at the last previous value. Note 1

Note 1: If the output of the PRI 150 is 16mA 50% and a communications failure occurs, the output will stay at 16mA 50% until the problem is resolved. Not swing to a current that is over range or under range.

14



Page: 15 of 50 Date: 04/02/2014

7.3 Command #48 - Additional Device Status The field device returns 8 bytes (0 - 7) of Additional Device Status information as per the HART 5.1 specification.

Table 3 - Device Status Bits Byte Bit Meaning Class Device

Status Bit Set

0 0 Device Failure (NVRAM checksum error) Error 4, 7, 3 1 Battery voltage / power too low Warning 4 2 Loop current Over range Warning 4 3 Loop current Under range Warning 4 4 Channel failed (D, S or P) Warning 4 5 Stage failed - Acceptable failure Warning 4 6 Stage failed - Unacceptable failure Error 4, 7, 3 7

1 0 Channel 1 Failed Warning 4 1 Channel 2 Failed Warning 4 2 Channel 3 Failed Warning 4 3 Channel 4 Failed Warning 4 4 Channel 5 Failed Warning 4 5 Channel 6 Failed Warning 4 6 Channel 7 Failed Warning 4 7 Channel 8 Failed Warning 4 2 0 Channel 9 Failed Warning 4 1 Channel 10 Failed Warning 4 2 Channel 11 Failed Warning 4 3 Channel 12 Failed Warning 4 4 Channel 13 Failed Warning 4 5 Channel 14 Failed Warning 4 6 Channel 15 Failed Warning 4 7 Channel 16 Failed Warning 4 3 0 Channel 17 Failed Warning 4 1 Channel 18 Failed Warning 4 2 3 4 5 6 7

4 0 No Pressure Correction Mode

15



Page: 16 of 50 Date: 04/02/2014

1 Internal Pressure Correction Mode 2 External Pressure Correction Mode 4 Simple Linearisation Mode 5 Tabular Linearisation Mode 6 Logarithmic Linearisation Mode 7 Simulation Mode Mode 7

5 0 Fixed Smoothing Mode 1 Dynamic Smoothing (Dual Smoothing factors) Mode 2 Mode 4 Mode 5 Mode 6 Mode 7 Mode 6 0 - 7 Extended Device Status - See Common Table 17 7 0 - 7 Device Operation Mode - See Common Table 14

"Not Used" bits are always set to 0.

Some of the bits used are for Error and warning reporting, others for Mode reporting. Bit 4 of the second response code is always set for a warning, bit 7 for an error.

These bits are set or cleared by the self-test at power up or following a reset or self-test command. They are also set (but not cleared) by any failure detected during continuous background self-testing.

16



Page: 17 of 50 Date: 04/02/2014

8 Universal Commands

The following commands are listed as clarification of the change from HART 6 to HART 5.1.

• Commands to be implemented 0, 1, 2, 3, 6, 11, 12, 13, 14, 15, 16, 17, 18, 19

8.1.1.1 Command #3 Command returns the primary variable PV and the SV for a total of 14 bytes of response data.

8.1.1.2 Command #14 The Units of the minimum span and limits are fixed to percent (unit code 57 decimal).

The minimum span of the device is 10%.

8.1.1.3 Command #15 First response byte will be set to 250 "Not Used".

17



Page: 18 of 50 Date: 04/02/2014

9 Common Practice Commands

9.1 Supported Common Practice Commands The following common practice commands are implemented.

• Command #33 Read Device Variables

Up to 46 Device variables can be read.

• Command #34 Write Primary Variable Damping Value

• Command #35 Write Primary Variable Range Values

• Command #38 Reset Configuration Changed Flag

• Command #40 Enter/Exit Fixed Current Mode

• Command #42 Perform Master Reset

• Command #45 Trim Loop Current Zero (4mA)

• Command #46 Trim Loop Current Gain (20mA)

• Command #47 Write Primary Variable Transfer Function

See Common Tables Specification Table 3 for Codes. Also see section 11.1 Manufacturer Specific Definitions for additional codes.

• Command #48 Read Additional Device Status

See section 0 Command #48 - Additional Device Status

• Command #50 Read Dynamic Variable Assignments

• Command #54 Read Device Variable Information

• Command #59 Write Number of Response Preambles

Command #34's value is used for the Slow Time constant it can be accessed using the device specific command or this command. They both point to the same variable.

If command #34 is used to write the Slow Time constant, it is assumed that dynamic time constant is not used. Therefore when writing a value using command #34 Dynamic Time Constant (Command #136 Read Damping Information and Command #137 Write Damping Information) damping is switched to normal.

Command #45 & #46 limits set to 3 - 5mA and 19 - 21mA respectively

9.2 Burst Mode The field device does not support burst mode.

9.3 Catch Device Variable The field device does not support Catch Device Variable.

18



Page: 19 of 50 Date: 04/02/2014

10 Device Specific Commands

The following Device Specific Commands are implemented.

Command #128 Read Date and Time, section 10.1.1

Command #129 Write Date and Time, section 10.1.2

Command #130 Read Calibration, section 10.1.3

Command #131 Write Calibration Source, section 10.1.4

Command #132 Read Calibration Counts #1 10.1.5

Command #133 Write Calibration Counts #1 10.1.6

Command #134 Read Calibration Counts #2 10.1.7

Command #135 Write Calibration Counts #2 10.1.8

Command #136 Read Damping Information 10.1.9

Command #137 Write Damping Information 10.1.10

Command #138 Read Timed Count Information 10.1.11

Command #139 Start Timed Count 10.1.12

Command #140 Read Tabular Linearisation Number of co-ordinates 10.1.13

Command #141 Write Tabular Linearisation Number of co-ordinates 10.1.14

Command #142 Read Co-ordinate 10.1.15

Command #143 Write Co-ordinate 10.1.16

Command #144 Read Fill Level 10.1.17

Command #145 Write Fill Level 10.1.18

Command #146 Read Fail Information 10.1.19

Command #147 Write Fail Information 10.1.20

Command #148 Read Pressure Correction Information 10.1.21

Command #149 Write Pressure Correction Information 10.1.22

Command #150 Read External Pressure 10.1.23

Command #151 Write External Pressure 10.1.24

Command #152 Read GM Configuration 10.1.25

Command #153 Read Write Protect Status 10.1.26

Command #154 Set Write Protect Status 10.1.27

Command #155 Read Battery Voltage 10.1.28

Command #160 Read Range Configurations 10.1.29

Command #161 Write Range Configurations 10.1.30

Command #175 Read Update Interval 10.1.31

Command #176 Write Update Interval 10.1.32

Command #177 Read GM count Totals 10.1.33

19



Page: 20 of 50 Date: 04/02/2014

10.1 Public Device Specific Commands 10.1.1 Command #128 Read Date and Time

Reads the Real Time Clock time and date.

Request Data Bytes Byte Format Description None

Response Data Bytes Byte Format Description

1 Unsigned - 8 Day (1-31) 2 Unsigned - 8 Month (1-12) 3 Unsigned - 8 Year (Years from 1900) 4 Unsigned - 8 Hour (0 - 23) 5 Unsigned - 8 Minute (0 - 59) 6 Unsigned - 8 Seconds (0 - 59)

Command-Specific Response Codes Code Class Description

0 Success No Command-Specific Errors 1-127 Undefined

10.1.2 Command #129 Write Date and Time

Writes the Real Time Clock time and date.

Request Data Bytes Byte Format Description




Command-Specific Response Codes

20



Page: 21 of 50 Date: 04/02/2014

Code Class Description 0 Success No Command-Specific Errors

1-2 Undefined 3 Error Parameter value too high 4 Error Parameter value too low 5 Error Too few data bytes received 6 Undefined 7 Error In Write Protect Mode

8-127 Undefined

10.1.3 Command #130 Read Calibration Source Information

Reads the calibration date, source type code and the strength of the source from calibration.



1 Unsigned - 8 Day (1-31) 2 Unsigned - 8 Month (1-12) 3 Unsigned - 8 Year (Years from 1900) 4 Unsigned - 8 Source Type Code (see Section 11.2) 5 Enum Unit Code - Common Table Spec Table 2 (%)

6 - 9 Float Source Strength as percentage



21



Page: 22 of 50 Date: 04/02/2014

10.1.4 Command #131 Write Calibration Source Information

Writes the calibration date, source type code and the strength of the source from calibration.


1 Unsigned - 8 Day (1-31) 2 Unsigned - 8 Month (1-12) 3 Unsigned - 8 Year (Years from 1900) 4 Unsigned - 8 Source Type Code (see Section 11.2)


1 Unsigned - 8 Day (1-31) 2 Unsigned - 8 Month (1-12) 3 Unsigned - 8 Year (Years from 1900) 4 Unsigned - 8 Source Type Code (see Section 11.2) 5 Enum Unit Code - Common Table Spec Table 2 (%)

6 - 9 Float Source Strength as percentage


0 Success No Command-Specific Errors 1 Undefined 2 Error Invalid Selection 3 Error Parameter value too high 4 Error Parameter value too low 5 Error Too few data bytes received 6 Undefined 7 Error In Write Protect Mode

8-127 Undefined

22



Page: 23 of 50 Date: 04/02/2014

10.1.5 Command #132 Read Calibration Counts #1

Reads the Normal Calibration Counts or Low Pressure Calibration Counts when in pressure correction mode.


Response Data Bytes Byte Format Description 1-3 Unsigned - 24 Background Counts (cps) 4-6 Unsigned - 24 Empty Counts (cps) 7-9 Unsigned - 24 Full Counts (cps)



10.1.6 Command #133 Write Calibration Counts #1

Writes the Normal Calibration Counts or Low Pressure Calibration Counts when in pressure correction mode.

Request Data Bytes Byte Format Description 1-3 Unsigned - 24 Background Counts (cps) 4-6 Unsigned - 24 Empty Counts (cps) 7-9 Unsigned - 24 Full Counts (cps)

Response Data Bytes Byte Format Description 1-3 Unsigned - 24 Background Counts (cps) 4-6 Unsigned - 24 Empty Counts (cps) 7-9 Unsigned - 24 Full Counts (cps)


23



Page: 24 of 50 Date: 04/02/2014


1-4 Undefined 5 Error Too few data bytes received 6 Undefined 7 Error In Write Protect Mode

8-127 Undefined

10.1.7 Command #134 Read Calibration Counts #2

Reads the Second Pressure Calibration Counts when using internal or external pressure correction modes, these parameters are only used in internal and external pressure correction modes. See section 12.9.2 Pressure Compensation for details.


Response Data Bytes Byte Format Description 1-3 Unsigned - 24 2nd Background Counts (cps) 4-6 Unsigned - 24 2nd Empty Counts (cps) 7-9 Unsigned - 24 2nd Full Counts (cps)



24



Page: 25 of 50 Date: 04/02/2014

10.1.8 Command #135 Write Calibration Counts #2

Writes the Second Pressure Calibration Counts when using internal or external pressure correction modes, these parameters are only used in internal and external pressure correction modes. See section 12.9.2 Pressure Compensation for details.

Request Data Bytes Byte Format Description 1-3 Unsigned - 24 2nd Background Counts (cps) 4-6 Unsigned - 24 2nd Empty Counts (cps) 7-9 Unsigned - 24 2nd Full Counts (cps)

Response Data Bytes Byte Format Description 1-3 Unsigned - 24 2nd Background Counts (cps) 4-6 Unsigned - 24 2nd Empty Counts (cps) 7-9 Unsigned - 24 2nd Full Counts (cps)


0 Success No Command-Specific Errors 1-4 Undefined 5 Error Too few data bytes received 6 Undefined 7 Error In Write Protect Mode

8-127 Undefined

25



Page: 26 of 50 Date: 04/02/2014

10.1.9 Command #136 Read Damping Information

Reads if the Dynamic Damping is enabled and what the Slow and Fast damping values are set to. Please note that the slow damping value is the same as in command #34.



1 Unsigned - 8 Damping type see section 11.3 Damping Type Codes 2-3 Unsigned - 16 Slow Time Constant (in Seconds) 4-5 Unsigned - 16 Fast Time Constant (in Seconds)



26



Page: 27 of 50 Date: 04/02/2014

10.1.10 Command #137 Write Damping Information

Writes the Dynamic Damping, Slow and Fast damping. When in dynamic damping mode which damping parameter is used is selected by the device not the host. The Fast Time constant must be less than the slow time constant, therefore the lower limit of the slow time constant is 1 seconds.

Please note that the slow damping value is the same as in command #34. See section 9.1 for details of command #34 effect on Dynamic Time constant values. Only this command should be used to write time constants when in Dynamic damping mode.


1 Unsigned - 8 Damping type see section 11.3 Damping Type Codes 2-3 Unsigned - 16 Slow Time Constant (in Seconds Default 30s) 4-5 Unsigned - 16 Fast Time Constant (in Seconds Default 10s)


1 Unsigned - 8 Damping type see section 11.3 Damping Type Codes 2-5 Unsigned - 16 Slow Time Constant (in Seconds) 6-9 Unsigned - 16 Fast Time Constant (in Seconds)


0 Success No Command-Specific Errors 1 Undefined 2 Error Invalid Selection 3 Error Parameter value too high 4 Error Parameter value too low 5 Error Too few data bytes received 6 Undefined 7 Error In Write Protect Mode

8-127 Undefined

27



Page: 28 of 50 Date: 04/02/2014

10.1.11 Command #138 Read Timed Count Information

Reads the Count Rate in cps from a specific channel, stage or all GM's. Channel and Stage selection is dependent on the physical configuration of the tubes. This determines the limits for the stages and channels. See section 3 for details of maximum limits.


1 Unsigned - 8 Counting Type see section 11.4 Counting Type Codes

2 Unsigned - 8 Channel or Stage Number (If all GM / Stages are counted this value is ignored)


1 Unsigned - 8 Counting Type see section 11.4 Counting Type Codes

2 Unsigned - 8 Channel or Stage Number (If all GM / Stages are counted this value is ignored)

3 - 5 Unsigned - 24 Count Rate in cps 6 - 7 Unsigned - 16 Remaining time of Timed Count in seconds 8 - 9 Unsigned - 16 Counting Period (Seconds) [Command #139 value.]


0 Success No Command-Specific Errors 1 Undefined 2 Error Invalid selection 3 Error Parameter value too high 4 Error Parameter value too low 5 Error Too few data bytes received

6-127 Undefined

10.1.12 Command #139 Start Timed Count

Writes the number of seconds over which the Timed Counts are to be collected. Once written the timer is started and the timer counts down while collecting counts.

Request Data Bytes Byte Format Description 1-2 Unsigned - 16 Counting Period (Seconds)

Response Data Bytes Byte Format Description 1-2 Unsigned - 16 Counting Period (Seconds)


28



Page: 29 of 50 Date: 04/02/2014


1-4 Undefined 5 Error Too few data bytes received 6 Undefined 7 Error In Write Protect Mode

8-127 Undefined

10.1.13 Command #140 Read Tabular Linearisation Number of co-ordinates

Reads the number of points in the Look Up Table. The minimum number of points is two and always starts at point 1. The number of co-ordinates starts at 1 and ascends sequentially to the number read. This information is only used when Tabular Linearisation is set.



1 Unsigned - 8 Number of co-ordinates (2-21)



29



Page: 30 of 50 Date: 04/02/2014

10.1.14 Command #141 Write Tabular Linearisation Number of co-ordinates

Writes the number of points in the Look Up Table. The minimum number of points is two and always starts at point 1. The number of co-ordinates starts at 1 and ascends sequentially to the number written. This information is only used when Tabular Linearisation is set.






0 Success No Command-Specific Errors 1-2 Undefined 3 Error Parameter value too high 4 Error Parameter value too low 5 Error Too few data bytes received 6 Undefined 7 Error In Write Protect Mode

8-127 Undefined

10.1.15 Command #142 Read Co-ordinate

Reads the value's of the Uncorrected and Corrected level for a particular Co-ordinate from the Look Up Table. A co-ordinate can be read outside the Maximum number of Co-ordinates used from Command #141, but not outside the 1 to 21 co-ordinate range. The value of the Uncorrected and Corrected level for a co-ordinate that is outside the Maximum number of co-ordinates from Command #141, will be fixed at "Not-a-Number" to indicate these co-ordinates are not used.


1 Unsigned - 8 Co-ordinate number (1-21)


1 Unsigned - 8 Co-ordinate number (1-21) 2 - 5 Float Uncorrected Level (%) 6 - 9 Float Corrected Level (%)

30



Page: 31 of 50 Date: 04/02/2014


0 Success No Command-Specific Errors 1-2 Undefined 3 Error Parameter value too high 4 Error Parameter value too low 5 Error Too few data bytes received

6-127 Undefined

10.1.16 Command #143 Write Co-ordinate

Writes the value's of the Uncorrected and Corrected level for a particular Co-ordinate from the Look Up Table. A co-ordinate cannot be outside the Maximum number of Co-ordinates used from Command #141.


1 Unsigned - 8 Co-ordinate number (1-21) 2 - 5 Float Uncorrected Level (%) 6 - 9 Float Corrected Level (%)


1 Unsigned - 8 Number of co-ordinates (1-21) 2 - 5 Float Uncorrected Level (%) 6 - 9 Float Corrected Level (%)


0 Success No Command-Specific Errors 1-2 Undefined 3 Error Parameter value too high 4 Error Parameter value too low 5 Error Too few data bytes received

6-127 Undefined

31



Page: 32 of 50 Date: 04/02/2014

10.1.17 Command #144 Read Fill Level

Reads the Fill Level at which the Full Counts were taken during calibration. If Full count was performed when the vessel was not filled with liquid (Covering the instrument span), the percent of liquid covering the instrument span is used.


Response Data Bytes Byte Format Description 1 - 4 Float Level (0 - 100%)



10.1.18 Command #145 Write Fill Level

Writes the Fill Level at which the Full Counts were taken during calibration. If Full count was performed when the vessel was not filled with liquid (Covering the instrument span), the percent of liquid covering the instrument span is used.

Request Data Bytes Byte Format Description 1 - 4 Float Level (0 - 100%)

Response Data Bytes Byte Format Description 1 - 4 Float Level (0 - 100%)



8-127 Undefined

32



Page: 33 of 50 Date: 04/02/2014

10.1.19 Command #146 Read Fail Information

Read the settings for defining when a device component is in an error or warning stage. See section 7 Status Information for details of settings.



1 Unsigned - 8 Continuous zero count time (Seconds) 2 Unsigned - 8 Acceptable Stage Failures (0 to 17, default 0)

3 - 4 Unsigned - 16 Max Count Rate for GM Error (cps) 5 - 8 Float Min Battery Voltage (Always set to 2) 9 - 12 Float Device Failed Loop Current (mA)

13 - 16 Float Stage Failed Loop Current (mA)



10.1.20 Command #147 Write Fail Information

Write the settings for defining when a device component is in an error or warning stage. See section 7 Status Information for details of settings.


1 Unsigned - 8 Continuous zero count time (Seconds) 2 Unsigned - 8 Acceptable Stage Failures (0 to 17, default 0)

3 - 4 Unsigned - 16 Max Count Rate for GM Error (cps) 5 - 8 Float Min Battery Voltage (Always set to 2) 9 - 12 Float Device Failed Loop Current (mA)

13 - 16 Float Stage Failed Loop Current (mA) Response Data Bytes

Byte Format Description 1 Unsigned - 8 Continuous zero count time (Seconds) 2 Unsigned - 8 Acceptable Stage Failures (0 to 17, default 0)

3 - 4 Unsigned - 16 Max Count Rate for GM Error (cps) 5 - 8 Float Min Battery Voltage (1 to 3.6V, default 2V) 9 - 12 Float Device Failed Loop Current (mA)

13 - 16 Float Stage Failed Loop Current (mA)

33



Page: 34 of 50 Date: 04/02/2014



8-127 Undefined

10.1.21 Command #148 Read Pressure Correction Information

Read the pressure correction settings and mode. The Pressure Correction Mode value is the same as the Additional Status setting (0 = None, 1 = Internal, 2 = External)



1 Unsigned - 8 Pressure Mode 2 - 3 Unsigned - 16 Pressure GM Damping (Internal Correction only,

seconds) 4 Enum Pressure Unit Code. See Common Table 2

5 - 8 Float Low Pressure (for External Correction) 9 - 12 Float High Pressure (for External Correction)



34



Page: 35 of 50 Date: 04/02/2014

10.1.22 Command #149 Write Pressure Correction Information

Writes the pressure correction settings and mode. The Pressure Correction Mode value is the same as the Additional Status setting (0 = None, 1 = Internal, 2 = External). Default Pressure units are Kpa (Code 12).



seconds) 4 Enum Pressure Unit Code. see Common Table 2




seconds) 4 Enum Pressure Unit Code. see Common Table 2



0 Success No Command-Specific Errors 1 Undefined 2 Error Invalid selection 3 Error Parameter value too high 4 Error Parameter value too low 5 Error Too few data bytes received 6 Undefined 7 Error In Write Protect Mode

8-127 Undefined

35



Page: 36 of 50 Date: 04/02/2014

10.1.23 Command #150 Read External Pressure

Reads the external pressure when in external pressure mode.



1 Enum Common Table Spec Table 2 Pressure units 2 - 5 Float Pressure



10.1.24 Command #151 Write External Pressure

Writes the external pressure when in external pressure mode. The standard unit must be same as the unit code written in Command #149 Write Pressure Correction Information. Otherwise an error occurs. Request Data Bytes

Byte Format Description 1 Enum Common Table Spec Table 2 Pressure units

2 - 5 Float Pressure


1 Enum Common Table Spec Table 2 Pressure units 2 - 5 Float Pressure

Command-Specific Response Codes Code 7Class Description

0 Success No Command-Specific Errors 1 Undefined 2 Error Invalid Selection

3 - 4 Undefined 5 Error Too few data bytes received 6 Undefined 7 Error In Write Protect Mode

8-127 Undefined

36



Page: 37 of 50 Date: 04/02/2014

10.1.25 Command #152 Read GM Configuration

Reads the configuration of the detectors.



1 Unsigned - 8 Detector Type (0 = S, 1 = P, 2 = D) 2 Unsigned - 8 Number of stages



10.1.26 Command #153 Read Write Protect Status

Reads whether the device is in Write Protect Mode. See section 12.11 for details.



1 Unsigned-8 Write Protect Codes see section 11.7 Write Protect Codes



10.1.27 Command #154 Set Write Protect Status

Sets or clears Write Protect Mode for the device. See section 12.11 for details. Request Data Bytes

Byte Format Description 1 Unsigned-8 1 = Write Protect Enabled, 0 = Write Protect Disabled


1 Unsigned-8 Write Protect Codes see section 11.7 Write Protect Codes

37



Page: 38 of 50 Date: 04/02/2014



3-127 Undefined

10.1.28 Command #155 Read Battery Voltage

Reads the measured battery voltage. The Battery voltage takes 32 seconds to be sampled after power up, during which time this command returns a response code #16. After 32 seconds it is sampled every 4 seconds.



1 Enum Unit Code - Common Table Spec Table 2 (Volts) 2 - 5 Float Battery Voltage (0 is faulty <2V, 3.6V is OK >2V)



10.1.29 Command #160 Read Range Configurations

Reads the scaled ranges X and Y for the different channels, this option is not used in the PRI 150. The first two parameters are ignored, only the third parameter is used see section 11.6 for range limit codes.


Response Data Bytes Byte Format Description 0 - 3 Float X Position when two or more detectors are used. 4 - 7 Float Y Position when three detectors are used.

8 Unsigned-8 Range Limit Codes



38



Page: 39 of 50 Date: 04/02/2014

10.1.30 Command #161 Write Range Configurations

Writes the scaled ranges X and Y for the different channels, this option is not used in the PRI 150. The first two parameters are ignored and can be any valid byte value, only the third is used see section 11.6 for range limit codes.

Request Data Bytes Byte Format Description 0 - 3 Float X Position when two or more detectors are used. 4 - 7 Float Y Position when three detectors are used.


Response Data Bytes Byte Format Description 0 - 3 Float X Position when two or more detectors are used. 4 - 7 Float Y Position when three detectors are used.




3 - 4 Undefined 5 Error Too few data bytes received 6 Undefined 7 Error In Write Protect Mode

8-127 Undefined

10.1.31 Command #175 Read Update Interval

Reads the update interval of the sampling period used in Command #177. The sampling period is a value from 0-10 in seconds. A value of 0 is a special condition that causes Command #177 to return rolling counters (see Command #177 for additional details). For a sampling period of 1-10, counts are averaged over this period.



0 Unsigned – 8 Update Interval (0-10 seconds)



39



Page: 40 of 50 Date: 04/02/2014

10.1.32 Command #176 Write Update Interval

Writes the update interval of the sampling period used in Command #177. The sampling period is a value from 0-10 in seconds. A value of 0 is a special condition that causes Command #177 to return rolling counters (see Command #177 for additional details). For a sampling period of 1-10, counts are averaged over this period.

All of the GM counters used in Command #177 are reset to zero on successful completion of this command.






0 Success No Command-Specific Errors 1-2 Undefined 3 Error Parameter value too high (>10)

4-6 Undefined 7 Error In Write Protect Mode

8-15 Undefined 16 Error Access restricted (device not in configuration mode)

17-127 Undefined

10.1.33 Command #177 Read GM Count Totals

Reads the GM count information. If the update interval (set with Command #176) is between 1 and 10 seconds then the GM counts are sampled over this period. The first byte is the sample counter / time stamp byte, which increments after every sampling period when the GM counts are updated.

If the update interval is 0 (zero) then rolling counters are implemented. In this mode the sampling counter is updated every second. On a sampling counter update each GM tube count is incremented by the number of counts that occurred during the last sample period (i.e. last second).

For example, a two GM tube system is placed into rolling counter mode. GM tube one is in a steady radiation field and observes 300 counts per second (cps). GM tube two is in a steady radiation field and observes 350 cps. The following table displays the values obtained from HART command #177:

Sample Counter GM Tube One GM Tube Two

0 300 350

1 600 700

… … …

183 55200 64400

185 55800 65100

40



Page: 41 of 50 Date: 04/02/2014

186 56100 65450

187 56400 265

… … …

255 11265 24065

0 11565 24415

In both modes the counters are volatile and will be reset with a system reset and a warm or cold start.

All 18 channels are returned regardless of the actual number GM tubes attached to the PRI 150. If a GM is not present then a count of 65535 is always returned.



0 Unsigned – 8 Sampling Counter 1-2 Unsigned – 16 GM 1 Count 3-4 Unsigned – 16 GM 2 Count 5-6 Unsigned – 16 GM 3 Count 7-8 Unsigned – 16 GM 4 Count

9-10 Unsigned – 16 GM 5 Count 11-12 Unsigned – 16 GM 6 Count 13-14 Unsigned – 16 GM 7 Count 15-16 Unsigned – 16 GM 8 Count 17-18 Unsigned – 16 GM 9 Count 19-20 Unsigned – 16 GM 10 Count 21-22 Unsigned – 16 GM 11 Count 23-24 Unsigned – 16 GM 12 Count 25-26 Unsigned – 16 GM 13 Count 27-28 Unsigned – 16 GM 14 Count 29-30 Unsigned – 16 GM 15 Count 31-32 Unsigned – 16 GM 16 Count 33-34 Unsigned – 16 GM 17 Count 35-36 Unsigned – 16 GM 18 Count



10.2 Non-Public Device Specific Commands There are no Non Public Device Specific Commands.

41



Page: 42 of 50 Date: 04/02/2014

11 Tables

11.1 Manufacturer Specific Definitions

240 Tabular Linearisation 241 Logarithmic Linearisation 242 - 249 Undefined

11.2 Source Type Codes

0 Caesium 137 1 Americium 241 2 Cobalt 60 3 - 249 Undefined 250-255 Reserved

11.3 Damping Type Codes 0 Normal - Slow damping only 1 Dynamic - Slow and Fast switching damping. 2 - 249 Undefined 250-255 Reserved

11.4 Counting Type Codes 0 Individual Channel Counting 1 Individual Stage Counting 2 All Stages are counted 3 - 249 Undefined 250-255 Reserved

11.5 Device Variable Code Table

0 Percent Level 2 - 249 Undefined 250-255 Reserved

11.6 Range Limit Codes

0 Normal Range Limits / Saturation point 1 4-20 mA Range Min / Max (No over or Saturation range) 3 - 249 Undefined 250-255 Reserved

11.7 Write Protect Codes Any bit not covered is “Undefined”. See section 12.11 for details.

0x01 Write Protected 0x02 Hardware Write Protected 0x04 Write Protection Physical Link Present

42



Page: 43 of 50 Date: 04/02/2014

12 Performance

12.1 Sampling Rates Typical sampling rates for sampling all GMs and producing a level.

Primary Level Sample 1 per second GM sampling 0.1 per second PV digital value calculation 1 per second Analogue Output Update 1 per second

12.2 Power Up On power up the device will have an output of 3mA and will go through the power up routine. This loads all current settings from battery backed memory and sets the device accordingly. This procedure will take no more than 4 seconds. After which a valid level will be available. If the battery has failed a checksum error will be produced and the device will be in a fault condition.

One Hundred milliseconds after power on the device will respond to messages. During the 0.1 to 4 seconds period the device will respond with a "Access restricted" code #16, for process information (Commands #1, #2, #3, #33). All other commands will respond correctly.

Since the device continually performs all diagnostic techniques any errors or warnings will be tested and acted upon accordingly.

If the device is set in External Pressure Correction Mode the value of the external pressure will be set to the default value.

The Cold Start bit is set and the Configuration Changed bit is restored.

12.3 Device Reset The device performs the same functions as a power up.

Only the Configuration Changed bit is restored.

12.4 Self Test Command #41 is not implemented as all self-diagnostic tests are performed continually. These include:

• GM tube Failure.

• Battery backed RAM checks (NVRAM CRC check).

• Microprocessor watchdog timers.

• Battery Voltage Level.

The cycle times to perform the tests are as follows:

Battery Voltage Level Check - 32 Seconds Cycle time on start-up, and 4 seconds Cycle time thereafter.

All Other Tests - 1 Seconds Cycle Time.

43



Page: 44 of 50 Date: 04/02/2014

12.5 Command Response Delay Minimum 2ms

Typical 10ms

Maximum 50ms

Device must reply within 256ms or timeout is flagged.

12.6 Busy and Delayed Response Busy and Delayed Response is not used within the device.

12.7 Long Messages The largest data field is used in the response to Command #177 Read GM Count Totals where 37 response bytes plus wrapping in the HART message packet.

12.8 Non-Volatile Memory Battery backed memory is used for the retention of data. New data is written to this memory every time a write command is performed. This process takes 3 seconds to write the information from RAM to NVRAM. If the power is switched off during this time the value would not have been written to NVRAM and the old value will be restored on power-up.

12.9 Operating Modes There is a number of operating modes, which perform different functions and effects on the primary variable and loop current.

12.9.1 Fixed Current Mode

This is implemented using Command 40. Power loss or reset clears this mode.

If an unacceptable stage failure or device error occurs, the software goes into a fixed current fault mode, the value of which is user selectable. The condition will not change until the fault is repaired or a higher number for the acceptable stage failures is set. See 10.1.20 Command #146 Read Fail Information, 10.1.19 Command #147 Write Fail Information and 7.2.1 Error & Warning Reporting for further explanation.

12.9.2 Pressure Compensation

This is implemented using Command 150. Power loss or reset doesn't effect this mode. Pressure correction alters density and therefore the level calculation. There are three modes of pressure correction.

1. No pressure Correction.

2. Internal Pressure correction - Where the top (1st) Stage is used to calculate pressure changes. The top stage uses the 2nd calibration parameters as calibration points for pressure correction.

The Background, Empty and Full counts contain the information from the 1st stage to the last stage. The calibration points for the top stage is then used in a calculation to remove the 1st stage counts from the total counts.

3. External Pressure correction - Where an external device calculates the pressure correction and uses Command #153 to write the pressure to the device. Correct units must be used when writing a pressure reading. Three Low pressure calibration points and Three High Pressure calibration points are used to compensate for pressure variations.

Table 4 shows which calibration settings are used for each pressure correction mode and an explanation of what each setting does.

44



Page: 45 of 50 Date: 04/02/2014

Table 4 - Calibration Settings Calibration Mode Background, Empty and Full Counts

used. 2nd Background, 2nd Empty and 2nd Full counts used.

No Pressure Correction

Yes No

Internal Pressure Correction

Yes (Including Top stage GM) Three calibration points for the top Stage only. This stage calculates the pressure change.

External Pressure Correction

Yes - These are Low-pressure calibration points.

Yes - These are High-pressure calibration points.

12.9.3 Damping Mode

This is implemented using Command 138 and Command 34. Power loss or reset doesn't effect this mode. Dynamic damping uses a mode that determines on the fly whether to use the slow damping factor (Normal Process conditions) or the fast damping factor (Dynamic Process Conditions).

12.10 Linearisation Mode This mode is implemented using Command 47. Power loss or reset doesn't affect this mode. It determines which linearisation method is used.

12.11 Write Protection The write protect mode is provided using Command 153 and Command 154 and a physical link on the PRI150 PCB. Write protection can be software based or software and hardware based depending on the combination of the write protect link and bit 0 in Command 153 as described below.

Bit 0 is used to enable or disable write protect. If no write protect link is present, software write protection is enabled or disabled only. If the link is present, setting this bit will enable both software and hardware write protect. This allows the link to be put in during commissioning, the device to be calibrated and then hardware write protecting without disturbing the device operation. Note that hardware write protect can only be disabled by removing the write protect link and clearing this bit.

Bit 1 is read-only bit and is used to indicate if hardware write protection is enabled (set) or disabled (clear).

Bit 2 is read-only and is used to indicate the whether the physical link is present (set) or not (clear).

When in write protect mode no variables or parameters can be changed until the device has been unlocked.

The exception to this rule is command #139 (counting period time), as this does not affect the device output or alter the configuration settings. Fixed mode output and calibration settings cannot be altered in write protect mode.

The rational for what is a variable or parameter is any command that will alter the output of the device if changed. Thus a device can be locked to ensure no unauthorised person can change the settings.

Write Protect Status is retained in NVRAM and is therefore a non-volatile setting.

45



Page: 46 of 50 Date: 04/02/2014

13 Non-Hart Information

There are no Non-Hart device specific commands implemented in the device.

46



Page: 47 of 50 Date: 04/02/2014

14 Appendix A - Hart Capability Specification

Manufacturer, Model and Revision PRI 150 TracercoTM SmartGauge, Rev 2

Device Type Transmitter

HART Revision 5.1

Device Description Available Yes

Number and Type of Sensors 1 to 18 internal GM sensors (Application Specific)

Number and Type of Actuators 0

Number and Type of host side signals 1: 4 - 20 mA Analogue

Number of Device Variables 42

Number of Dynamic Variables 2

Mappable Dynamic Variables No

Number of Common Practice Commands 15

Number of Device Specific Commands 33

Bits of Additional Device Status 8

Alternative Operating Modes Yes

Burst Mode No

Write Protection Yes

47



Page: 48 of 50 Date: 04/02/2014

15 Appendix B - Default Configuration

Parameter Default Value

Lower Range Value 0 %

Upper Range Value 100 %

PV Units Percent

Linearisation Linear

Look Up Table Not Configured

Pressure Correction No Pressure Correction

Pressure Correction Settings Not Configured

External Pressure value 2 Kpa

Dynamic Damping Normal (Slow)

Fast Damping Constant 10 Seconds

Slow Damping Constant 30 Seconds

Background Counts 0 cps

Empty Counts 100 cps

Full Counts 0 cps

Simulation Mode Disabled

Source Code Caesium

Date and Time Current Date & Time

Continuous Zero Count Time 30 seconds

Acceptable Stage Failures 0

Maximum Count Rate for GM Error 3000 cps

Minimum Battery Voltage 2.0 V

Device Failed Loop Current 2.0 mA

Stage Failed Loop Current 3.0 mA

Timed Count 1000 seconds

Number of Response Preambles 5

Look Up Table co-ordinate 1 0%

Look Up Table co-ordinate 2 100%

Number of co-ordinates 2

48



Page: 49 of 50 Date: 04/02/2014

16 Appendix C - Revision History

16.1 Release Ver A 1) 4.2.2 - Percentage values added.

2) 4.2.3 - Restricted Range limit section added.

3) 4.3 - Write protect link explanation included.

4) 7.2.1.1 - GM failure equation changed.

5) 7.2.3 - Error condition reporting section added.

6) 10.1.29 - Read Range Configurations command added.

7) 10.1.30 - Write Range Configurations command added.

16.2 Release Ver B 1) 4.3 - Write protect link definition altered, scenarios added.

2) 10.1.27 - Command Specific Response added.

16.3 Release Ver C 1) 5 – Additional Device Variables added.

2) 6 – SV added. Top stage as a percentage.

3) 10.1.6, 10.1.8 - Empty and full Counts must be >= Background Count.

16.4 Release Ver D 1) 2 – Drawing & Device revision updated, Hardware revision added and changed to 2.

2) 5 – Device Variable 42 added.

3) 10 – Device Specific command list updated.

4) 10.1.19 – Battery Voltage Fixed.

5) 10.1.20 – Battery Voltage Fixed.

6) 10.1.28 – Battery Voltage now fixed at 0V (faulty) or 3.6V (OK).

7) 10.1.31 – Command #175 Read Update interval added.

8) 10.1.32 – Command #175 Write Update interval added.

9) 10.1.33– Command #177 Read GM count totals added.

10) 14 – Data updated for latest version

16.5 Release Ver E 1) 2 – Device revision updated to 3, hardware revision modified to 0 and Software revision added

and set to 11.

2) 2 – Image modified to show PRI 150 – A – 4 rather than PRI 150 – H

3) 10.1.31 – Command #175 extended to allow 0 to be returned to represent rolling counters in Command #177

49



Page: 50 of 50 Date: 04/02/2014

4) 10.1.32 – Command #176 extended to allow update interval to be set to 0 to enable rolling counters in Command #177

5) 10.1.33 – Command #177 extended to use rolling counters when the update interval has been set to 0.

6) 12.7 – Long Messages updated to show that Command #177 is now the longest message.

16.6 Release Ver F 1) Updated description of Command #153 and Command #154.

2) Added Table 11.7 Write Protect Codes.

3) Added description of hardware write protection to section 12.11.

4) Added timings to section 12.5.

50

hart field device specification...hart protocol host device for full communication capability. this...

Documents