Detcon CXT-DM - Manual (Page 19)

Model CXT-DM
a) Attach the calibration adapter to the threaded sensor housing or connect tubing to the integral cal port.
Apply the test gas at a controlled flow rate of 200-500cc/min (500cc/min is the recommended flow).
Observe that the ITM display decreases to a level near zero.
NOTE: Wind Guard must be used when calibrating with the integral cal port to ensure proper
calibration.
b) Remove test gas and calibration adapter. The ITM display should return to a reading of 20.9%.
Initial operational tests are complete. CXT-DM O
2
deficiency sensors are factory calibrated prior to shipment,
and should not require significant adjustment on start up. However, it is recommended that a complete
calibration test and adjustment be performed 16 to 24 hours after power-up. Refer to zero and span calibration
instructions in Section 3.3.
CXT-DM Instruction Manual Rev. 1.6 Page 15 of 52