Calibrate Ma Input Channel Loops - Honeywell Touchpoint Plus Technical Handbook

MAN0984_Iss 2_06/15

7.12 Calibrate mA input channel loops

Where the sensor or transmitter has the facility, the mA loop should always be calibrated at the Touchpoint Plus
controller by forcing signal levels at the sensor / transmitter. Any gas calibration required must be carried out at
The Touchpoint Plus controller calibration should not be used to adjust for deficiencies in the sensor / transmitter
Caution: Ensure that any relay activation (drenchers, repeater alarms, etc.) is inhibited before starting this
test.
If the sensor is an Oxygen sensor that is not being used with a transmitter that has a force mA function, the
span gas should normally be air at 20.9% v/v Oxygen.
The Touchpoint Plus controller calibration should not be used to correct deficiencies in the sensor calibration;
instead carry out a gas calibration at the sensor according to the manufacturer's instructions.
To calibrate the mA loop of an input channel, please follow the procedure below in combination with the
relevant instructions in the sensor manual.
1) Login as an Administrator or Engineer.
2) Select the Menu>Maintenance>Gas Calibration. Select the channel to be calibrated.
3) Select 'Start' for Zero Calibration.
4) Apply a test gas to the sensor / field device so that it will generate a 4 mA signal.
5) View the reading until it is stable, and then touch 'Apply'.
6) Select 'Next' to move to the Span Calibration screen.
7) Enter the target span gas concentration and touch 'Apply'.
8) Select 'Start' for Span Calibration.
9) View the reading until it is stable, and then touch 'Apply'.
Commissioning
the field device according to the manufacturer's instructions.
gas calibration. Failure to observe this can result in significant accuracy errors.
Only trained technicians are authorized to carry out calibration.
Warning
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Touchpoint Plus
Technical Handbook