Model CXT-IR
CXT-IR Instruction Manual
Rev. 2.1
Page 17 of 48
2.6
Initial Start Up
2.6.1
Combustible Gas Sensors
Upon completion of all mechanical mounting and installation of the batteries power is now applied to the unit.
If the unit is equipped with the optional power switch, power is applied by pushing the switch. Observe the
following normal conditions:
1.
Upon power up, the sensor will momentarily display
SY
, scroll
DETCON CXT-IR
and will then display
the current reading for approximately 5 seconds. A temporary upscale reading may occur as the sensor
stabilizes. This upscale reading will decrease to 0% LEL within 1 to 2 minutes of power-up, assuming there
is no gas in the area of the sensor.
2.
After the initial power up, the sensor display will turn off. Thereafter the display will come on once every
10 seconds and will display the current reading for about 2 seconds, and will return to a blank display to
conserve battery power.
NOTE
: In normal operation the display will come on once every 10 seconds, will display the
current reading for about 2 seconds, and will return to a blank display to conserve battery power.
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
: 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. 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.
2.
Remove test gas and observe that the display decreases to 0.
3.
If a calibration adapter was used during these tests, remove it from the unit, and re-install the Splash
Guard. 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.
