Calibration Handbook
48 Apex Transmitter and Sensor
make the final connection due to the inflexibility of PTFE. This minimizes adhesion of the gas to the tube
surface and allows for more accurate measurement.
WARNING
As some test gases may be hazardous, the Flow Housing outlet should exhaust to a safe area.
17. Apply the target gas to the Certified Sensor at a rate of between 0.7l/m and 1.0l/m. Wait for the gas
reading to stabilize before continuing.
NOTE
CAUTION
calibration rests with the user. Refer to the local regulations where appropriate.
18. Press ok, the LCD screen displays the message: Calibrating - Wait
0
CO 100 ppm
Span Calibration
Calibrating - Wait
19. When calibration is successfully completed the message is displayed: Success! OK:Continue
0
CO 100 ppm
Span Calibration
Success! OK : Continue
Ensure that the sensor and the vicinity around it is clear all traces of the calibration gas before continuing.
This is to avoid triggering spurious alarms.
If calibration fails at any point discard the cartridge and replace with a new one.
20. Press ok, the Calibration Menu is displayed again.
Calibration Menu
Gas Calibrate
Gas Challenge
4-20 mA Set Zero
Force 4-20mA
Force Relays
Force Digital
21. Press the esc button twice. The Main Menu and then the Gas Reading screen is displayed.
22. Remove the test equipment, refit the sensor cap to the sensor (with reinstalled filter if previously removed
for the test) and return the system to normal operation.
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