Detcon CXT-IR - Manual (Page 19)

Model CXT-IR
Initial Operational Tests
After a warm up period of 1 hour (or when zero has stabilized), the sensor should be checked to verify
sensitivity to the target gas.
Material Requirements
• Detcon PN 613-120000-700 700 Series Splash Guard with integral Cal Port and Calibration Wind
Guard (P/N 943-000000-000) -OR-
• Detcon PN 943-000006-132 Threaded Calibration Adapter - OR -
• Detcon P/N 943-01747-T05 Teflon Calibration Adapter for highly reactive gases
• Detcon Span Gas; 50% of range target gas in balance N
2
or Air at fixed flow rate between 200-
500cc/min
NOTE
Calibration gas generators using perm tubes or electrochemical sources may be used in
place of span gas cylinders.
NOTE
Wind Guard must be used when calibrating with the integral cal port to ensure proper
calibration.
1. Attach the calibration adapter to the Splashguard Adapter Assembly or connect tubing to integral cal
port. It is recommended that the Wind Guard (Detcon PN 943-000000-000) is installed over the Splash
Guard during calibration.
2. Apply the test gas at a controlled flow rate of 200 - 500cc/min (500cc/min is the recommended flow).
Observe that the ITM display increases to a level near that of the applied calibration gas value.
3. Remove test gas and observe that the display decreases to 0.
4. If a calibration adapter was used during these tests, remove it from the unit, and re-install the Splash
Guard.
5. If the wind guard was used, remove the wind guard.
Initial operational tests are complete.
CXT-IR Combustible gas 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 calibration instructions in Section 3.3.
CXT-IR Instruction Manual Rev. 1.6 Page 15 of 44