Calibrating Mv Input Channels; Adjusting The Mv Sensor Baseline; Calibrating A Mv Sensor Channel - Honeywell Touchpoint Plus Technical Handbook

MAN0984_Iss 2_06/15

7.11 Calibrating mV Input Channels

Gas readings may be generated during this procedure. Disable or inhibit any operations or actions that may
For catalytic bead type detectors, the Analogue Input Modules form part of the measuring circuit. Therefore all
You should consider alternative safety measures when performing these procedures.

7.11.1 Adjusting the mV Sensor Baseline

It is important to select 'First Span' when calibrating a new or replacement sensor for the first time, and 'Span'
for all calibrations thereafter.
It is important to select 'Adjust mV Baseline' when calibrating a new or replacement sensor for the first time,
and 'Span' for all calibrations thereafter. This also applies when either the detector type or sensor type is
changed during channel configuration, even though the sensor itself remains the same.
Doing this correctly allows a time window in which to safely organise replacement of nearly spent
catalytic bead sensors.
Doing it incorrectly may result in a spent sensor with no protection at all.
1) Replace the catalytic bead sensor in accordance with its' manual.
2) Check the mV sensor wiring is undamaged and correctly connected.
3) Perform the next check under clean air.
4) Login as an Administrator or Engineer.
5) Select the Menu>Maintenance>Adjust mV Baseline and select a mV input channel.
6) Touch 'Start'.
7)
Check mV sensor type setting is correct.
8) Carry out the sensor calibration as shown in the next section (the mV input channel will be automatically
inhibited during this procedure).

7.11.2 Calibrating a mV Sensor Channel

To calibrate a mV input channel, follow the procedure below in combination with the relevant instructions in
the sensor manual.
1) Login as an Engineer.
2) Select Menu>Maintenance>Gas Calibration. Select the channel to be calibrated.
3) Select 'Start'. Zero calibration and apply clean air to the sensor.
4) View the reading until it is stable, and then touch' Apply'.
5) Confirm the zero calibration result and then touch 'Next'.
6) Enter the concentration of the span gas and touch 'Start'.
7) When ready touch 'Start' and apply gas to the sensor.
8) View the reading until it is stable, and then touch 'Apply'.
9) Confirm that the gas reading is correct.
10) Remove the span gas from the sensor, and confirm that the gas reading has returned to zero (the mV
input channel will be automatically inhibited during the calibration procedure).
Commissioning
Caution – Alarm Inhibit
result from gas readings before starting this test.
commissioned mV channels remain in Inhibit state until they are calibrated.
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Technical Handbook