Author: Paul Storey

Date: 11 December 2019

Document no.: MD1079 Rev. D

HART Device Descriptor Manual

T221 Optimus™

MD1079 Rev. D 2 of 14

Table of Contents

1 Introduction ................................................................................................. 3

1.1 Scope and Purpose .................................................................................... 3

1.2 Related Documents ................................................................................... 3

1.3 Abbreviations and Definitions ..................................................................... 3

2 Product Overview ......................................................................................... 4

3 Device Descriptor Overview .......................................................................... 5

4 Menu Structure ............................................................................................. 6

5 Process Variables ......................................................................................... 7

5.1 Process Level............................................................................................ 7

5.2 Maximum Build-Up .................................................................................... 7

5.3 Elevation of Maximum Build-Up .................................................................. 7

5.4 Average Gas Phase Build-Up ...................................................................... 7

5.5 Average Total Build-Up .............................................................................. 7

5.6 Process Level by Traditional Calculation ....................................................... 8

5.7 Radiation Source Strength ......................................................................... 8

5.8 Normalised Stage Count Rates .................................................................... 8

5.9 Build-Up Per Stage .................................................................................... 8

6 Dynamic Variables ........................................................................................ 9

7 Status Information ..................................................................................... 10

8 Device Configuration .................................................................................. 12

Revision History ............................................................................................... 13

MD1079 Rev. D 3 of 14

1 Introduction

1.1 Scope and Purpose

This document describes the HART Device Descriptor for the Tracerco T221 Optimus™. It

is intended to aid in interfacing to a Tracerco Optimus™ using the Device Descriptor1. It

only covers the device features which can be accessed using the HART Device Descriptor

and is not intended to describe the full HART interface of the device.

1.2 Related Documents

• HART Field Device Specification for Tracerco T221 - Tracerco Document TD1071

• HART Communication Protocol Specifications- from the HCF

1.3 Abbreviations and Definitions

DAC Digital to Analogue Conversion

DD Device Descriptor

GM Tube Geiger-Muller Tube

HART Highway Addressable Remote Transducer. A field communications protocol.

HCF HART Communications Foundation at time of release – now FieldComm Group

LED Light Emitting Diode

1 The T221 Optimus™ is not registered with the FieldComm Group.

MD1079 Rev. D 4 of 14

2 Product Overview Optimus™ is a nucleonic level system. It consists of:

• Up to four Tracerco PRI 150 radiation detectors

• Nucleonic sources

• T221 Optimus™ control module.

Together, these provide a non-invasive method that can determine the system level.

Due to unique and specialist algorithms, which are implemented in the Optimus™ control

module, the provided level is resilient to:

• Product Build-Up on the vessel walls

• Pressure fluctuations

• Spray and Mists.

This makes the system usable where other standard nucleonic level systems would be

inaccurate.

The Optimus™ control module has additional features such as the ability to provide an

indication of the level of build-up that is present on the vessel wall. This information is

accessible through the DD.

MD1079 Rev. D 5 of 14

3 Device Descriptor Overview The DD is intended to allow enhanced monitoring of Optimus™. It enables all Device

Variables to be read as well as comprehensive device status.

Some basic device configuration and calibration is also supported. However, full device

calibration is beyond the scope of the DD and is supported by other tools.

The DD also allows an operator to issue Device Reset and Squawk commands to

Optimus™.

MD1079 Rev. D 6 of 14

4 Menu Structure The menu structure of the DD is illustrated below.

The menu structure is based on the standard layout suggested by the HCF. Additional

menus have been added under Process variables and Status to better organise the

information.

MD1079 Rev. D 7 of 14

5 Process Variables The device supports 151 Device Variables, all of which can be read using the DD.

5.1 Process Level

This device variable represents the process level and is resistant to:

Solids build-up on the vessel wall

Variations in pressure

Units: percent

5.2 Maximum Build-Up

Optimus™ is capable of providing an up to date indication of solids build-up on the vessel

wall for stages that are in the gas phase. This Device Variable reports the value of the

stage with the maximum build-up present.

Units: cm

5.3 Elevation of Maximum Build-Up

Optimus™ is capable of providing an up to date indication of solids build-up on the vessel

wall for stages that are in the gas phase. This Device Variable reports the elevation of the

centre of the stage with the maximum build-up present.

Units: percent

5.4 Average Gas Phase Build-Up

Optimus™ is capable of providing an up to date indication of solids build-up on the vessel

wall for stages that are in the gas phase. This Device Variable reports the average build-

up of all stages currently in the gas phase.

Units: cm

5.5 Average Total Build-Up

Optimus™ is capable of providing an up to date indication of solids build-up on the vessel

wall for stages that are in the gas phase. This Device Variable reports the average build-

up of all stages.

Units: cm

MD1079 Rev. D 8 of 14

5.6 Process Level by Traditional Calculation

This Device Variable provides the process level as it would have been reported using

traditional nucleonic calculation. This level is NOT resistant to:

• Solids build-up on the vessel wall

• Variations in pressure

Units: percent

5.7 Radiation Source Strength

Radiation sources decay with time. The amount of decay is related to the radio nuclide.

This Device Variable reports the source strength as a percentage of its strength at the

calibration date.

Units: percent

5.8 Normalised Stage Count Rates

Optimus™ supports up to 72 stages. Each stage has a count rate between 0 and 1 which

represents the amount of radiation incident on that stage. These normalised count rates

are represented by these Device Variables. The number of these device variables shown

will automatically adjust for the number of stages present.

Units: none

5.9 Build-Up Per Stage

Optimus™ is capable of providing an up to date indication of solids build-up on the vessel

wall for stages that are in the gas phase. These Device Variables report the amount of

build-up present for each stage. The number of these device variables shown will

automatically adjust for the number of stages present.

Units: cm

MD1079 Rev. D 9 of 14

6 Dynamic Variables Four Dynamic Variables are implemented. The Primary Variable (PV) has a fixed mapping

to Device Variable 0, Process Level. The other three Dynamic Variables have a configurable

mapping to any Device Variable.

The default Dynamic Variable mapping is shown below:

Dynamic Variable Device Variable Number Name

PV (Fixed) 0 Process Level

SV 1 Maximum Build-Up

TV 2 Elevation of Maximum Build-Up

QV 4 Average Gas Phase Build-Up

The Dynamic Variable mapping can be viewed and edited under the Basic Setup menu.

MD1079 Rev. D 10 of 14

7 Status Information The Status menu contains numerous status flags. These are described in the following

table.

Flag Class Description

Channel n Enabled The system has been configured to use this detector channel.

Channel n GM Failure Warning At least one GM tube has failed in the

detector connected to this channel

Channel n Not Found Error The Optimus™ control module could not communicate with a PRI150 radiation

detector on this channel.

Channel n Config Mismatch Error The PRI150 radiation detector connected to this channel is different that which has been configured. This may be the number of stages or the type (S or D).

Channel n Hardware Write Protect Set

Error The PRI150 radiation detector connected to this channel has its hardware write protect jumper enabled.

Channel n Incorrect Firmware Version

Error The PRI150 radiation detector on this channel has a version of firmware that is not

compatible with the Optimus™ control

module.

RTC Fault Warning The real time clock in the Optimus™ control module has failed or has never been set.

Radiography Detected Warning The system has detected that radiography is

being conducted and therefore the level output may not be an accurate representation of the process.

In Discovery Mode Mode The system is in detector discovery mode

Build-Up Alarm Warning The system has detector an excessive amount of solids build-up in the vessel. The accuracy of the reported level may be compromised.

Stage Failure Warning The GM tubes for an entire stage have failed. If the level is in the vicinity of this stage then

accuracy will be reduced.

Critical Stage Failure Error A stage which is configured as critical has failed.

Linearisation Table Fault Error There is an error with the configuration of

the linearisation table.

Trim Point Fault Error This is an error with the trim point configuration.

Warm Up Error The system is still warming up after a reset or cold start. It will resume normal operation

after the warm up phase is complete.

MD1079 Rev. D 11 of 14

Flag Class Description

Non-Volatile memory failure Warning An error was found in the non-volatile memory. Some or the entire configuration may have been lost.

Watchdog reset executed Warning The Optimus™ control module detected an internal fault and performed a device reset to recover.

Device Configuration Locked Mode The configuration of the Optimus™ control module is write-protected.

There are also sub menus under the Status menu for each detector channel. These display

the following information.

Item Description

Channel n stages The actual number of stages in the detector connected to this channel.

Channel n detector type The actual type of the radiation detector connected to this channel. S for single, D for double.

Channel n number of failed tubes

The number of GM tubes that have failed in the radiation detector connected to this channel.

Channel n communication errors

A count of the number of communication failures between the Tracerco Optimus™ control module and the radiation

detector connected to this channel. Cleared by a device reset

or power cycle.

MD1079 Rev. D 12 of 14

8 Device Configuration The DD supports some basic configuration of the device:

The Device Information menu allows viewing and editing of the following standard HART

items: Tag, Descriptor, Date, Long Tag and Final Assembly Number.

The HART Polling Address can be configured using the HART output menu.

The Loop current mode can be configured in the Analog output menu. The same menu

also allows a loop test to be run and the loop current DAC to be calibrated.

If it is desired to change the range that the loop current represents, this can be achieved

using the Range values edit display which is located under the Basic setup menu.

MD1079 Rev. D 13 of 14

Revision History

Rev. Description Author /

Date

Checked /

Date

Approved /

Date

D Footnote added to section 1 to

explain that the T221 Optimus is

not registered with the

FieldComm Group.

HCF definition updated in section

1.

Document updated to new

template following branding

guidelines.

Table of contents corrected.

P Storey

11-Dec-19 R Ryles

11-Dec-19

E Sanchez

11-Dec-19