Calibration Handbook
47Apex Transmitter and Sensor
10. Ensure there is no gas present on the Certified Sensor.
If gas is suspected to be in the vicinity of the sensor either check the area using a calibrated portable
gas sensing device, e.g. Honeywell Analytic’s Impact, or flow clean air over the Certified Sensor using
the Flow Housing accessory.
11. Press ok. The Transmitter Unit zeros the sensor. The LCD screen displays the message: Calibrating - Wait.
When successfully completed the LCD screen shows the message: Success! OK:Continue
0
CO 100 ppm
Zero Calibration
Calibrating - Wait
0
CO 100 ppm
Zero Calibration
Success! OK : Continue
12. Press ok. The Span Calibration screen is displayed with the message: Calibrate? OK/ESC. This gives
the choice to stop the calibration procedure at this point (after zero calibration) or continue to include the
span and full gas calibration.
Span Calibration
Calibrate? OK/ESC
13. Press ok to continue with Span Calibration. To skip the span calibration process, press the esc key.
WARNING
If Span Calibration is not required you MUST exit the process at this point otherwise the sensor will be damaged.
NOTE
may be displayed, e.g. C
7
H
8
has the options C
7
H
8
and CH
4
Span Calibration
Span Conc.
50 %LEL
14. Set the required test gas Span Conc. value using the up/down keys.
15. Press ok. The LCD screen displays the message: Apply Gas then <OK>
0
CO 100 ppm
Span Calibration
Apply Gas then <OK>
16. Connect the Flow Housing (using either gas pipe) to the regulated cylinder containing a known concentration
of the target gas at approximately the sensor alarm point, e.g. 50% LEL Methane in air.
It is recommended for most sticky gases the tubing should be PTFE with short pieces of rubber tube to
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