User Manual
cGas Ammonia Vent Line Transmitter - Addendum Rev. B | 2022.09
14 © 2022 All rights reserved. Data subject to change without notice.
Ammonia is a reactive gas and can adhere to surfaces which can reduce the amount of gas
that reaches the sensor. When calibrating an ammonia sensor use a length of tubing no
longer than 0.6 to 1 m / 2 to 3 ft. If a longer length is necessary, use Teon lined tubing to
ensure the correct concentration of gas reaches the sensor.
5.4 Zero (Null) Calibration
Catalytic sensors require oxygen to work and thus the user MUST ow clean air or oxygen to
obtain a true zero.
NOTE: To exit the Zero Calibration at any time, press ENTER.
From the main display, press ENTER.
Enter passcode 3032 using the UP button and ENTER button.
Enter Password
3032
Press ENTER to access the Calibrate Menu.
Calibrate Menu
Press Enter
In the Selected Channel menu, conrm the desired channel is showing.
Selected Channel
NH3
Press the UP button to nd Calibrate Zero.
Calibrate Zero
100 AD
Press ENTER if using ambient air or attach the regulator to the cylinder of zero air, insert
the calibration adapter into the sensor opening on the front of the enclosure door (refer to
Section 6.3.1 Calibration Adapter Plug if the adapter will not t). Press ENTER to start the
Zero calibration. The display will show a countdown from 20 seconds.
Zeroing
47AD
18s
Zero Success
56AD
When the process has nished and the Zero calibration was accepted, press ENTER and use
the UP button navigate to Exit and press ENTER to exit. Remove the cylinder of zero gas. If
the Zero Calibration was not successful refer to Section 6.3.2 Zero Fault.
5.5 Span Calibration
Span calibration is owing a known concentration of the target gas over the sensor to adjust
the output signal to match the gas concentration. It resets the sensor’s electronic circuit
against a known concentration of target gas to correct drift and keep linearity.
Catalytic sensors require oxygen to work and thus the span gas must have “air” balance, not
N2 balance. The factory default used to calibrate the cGas Ammonia Vent Line Detector prior
to shipping is 0.5 % vol (5000 ppm) air balance.