How To Calibrate Mv Input Channels - Honeywell Touchpoint Plus Technical Handbook

MAN0984_Iss 2_06/15

8.10 How to Calibrate mV Input Channels

Catalytic sensors should be calibrated periodically according to the manufacturer's recommendations. This
should be a two-person job to avoid the controller timing out and losing the settings.
Note: To enable a calibration interval for the channel, edit the interval setting before starting calibration (see
Ch.7.6.2 Configuring a Channel and Ch.7.6.3 Editing a Configured Channel).
You should select First Span only when calibrating a new or replacement sensor for the first time. You then
adjust the mV Baseline, and then you should use Span for all calibrations thereafter (see Note below).
Note: Adjustment of the Baseline is only required when a mV channel is configured for the first time or when a
catalytic bead element is replaced. Once the Baseline is established it should not be adjusted for second or
subsequent gas calibrations, or until the next catalytic bead replacement.
For greater accuracy, catalytic gas detectors should be calibrated using a certified gas/air mixture
equal to 50 %LEL of the actual target gas being monitored. Always refer to the sensor technical manual for
If you cannot obtain an exact or certified span gas match you can carry out a 'cross-calibration' using a similar
hydrocarbon / air mix. Always follow the sensor manufacturer's data sheet when cross-calibrating sensors.
To calibrate a mV Input Channel:
1) Install or replace catalytic bead sensor elements according to their technical manual.
2) Login as an Administrator or Engineer.
3) Select the Menu>Maintenance>Adjust mV Baseline and select a mV input channel.
4) Select the Menu>Maintenance>Gas Calibration. Select the channel to be calibrated:
5) Select 'Start' Zero calibration and apply clean air to the sensor:
Maintenance
Caution
detailed information.
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Touchpoint Plus
Technical Handbook