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HART Procedures Procedural Considerations

Release 0 34-ST-25-20 MC Toolkit User Manual 41

7/03

Menu Item Task

EXTENDED INFO

Observe (Read):

· Universal Rev.

· Software Rev.

· Field Device Rev.

· Poll Address

· PROM ID

· # Req. Preams

· PV Sensor S/N

· Final Assembly #

DYNAMIC VARS

Enter:

· Primary Variable Code

· Secondary Variable Code

· Tertiary Variable Code

· Quaternary variable Code

BURST MODE

Select:

· Burst Mode

· Burst Options

SPEC. MONITOR

Select:

· No. of Var's Query

· Device variable

Observe (Read)_:

· Values of selected variables

Procedural Considerations

The details of procedures vary with device type. This section contains a set of procedures for Honeywell

HART Transmitters, and separate set of procedures for non-Honeywell HART devices.

Input Calibration

Input calibration of transmitters should be done only when necessary, and should be done only under

conditions that will ensure accuracy:

· The transmitter should be taken out of service, and should be moved to an area with favorable

environmental conditions: clean, dry, and temperature-controlled.

· The source for the input pressure must be very precise, and must be certified for correct operation.

· The procedures should be done by qualified personnel.

For Honeywell HART devices, input calibration procedures are given in Table 12 through Table 14, and

for non-Honeywell HART devices, the procedure (Zero Trim) is given in Table 20.

Output Calibration

The Loop Test procedure is intended as a check for continuity and condition of components in the output

current loop. The procedure for Honeywell HART devices is given in Table 15, and for non-Honeywell

devices, it is given in Table 22.

The D/A Trim procedure calibrates the output of the Digital to Analog converter for minimum (0%) and

maximum (100%) values of 4 mA and 20 mA, respectively. This procedure is used for transmitters

operating on-line in analog mode, to ensure proper operation of the transmitter with all associated circuit

components (wiring, power supply, control equipment, etc). It is necessary to use precision test equipment

(a voltmeter and in-circuit resistor or an ammeter).

The procedure for Honeywell HART devices is given Table 16, and for non-Honeywell HART devices, it

is given in Table 23.

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