65-2640XL-04 M2A Transmitter Operator’s Manual
Chapter 7: Maintenance
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2. Screw the calibration gas cylinder into the fixed flow regulator.
3. Turn the regulator knob counterclockwise to open the regulator.
4. Allow calibration gas to flow for the length of time determined in “Determining Response
5. Turn the regulator knob clockwise to close it.
6. Unscrew the calibration gas cylinder from the fixed flow regulator. The M2A will continue to
display the maximum gas response on the display and retain the response level in its memory.
7. Adjust the gas reading up or down to match the calibration gas cylinder concentration
by using the UP/YES and DOWN/NO buttons, then press and release the ENTER
button.
NOTE:
The detector must be calibrated with a gas concentration between 10% and
100% of the channel’s full scale value (ie. between 10% LEL and 100%
LEL).
8. The M2A will perform a span operation. The display will indicate
SPAN Gas PASS
for a few
seconds, then indicate
SPAN Gas SAVED
before indicating
Leaving CAL Mode
for a few
seconds.
NOTE:
If the span adjustment fails, see “Troubleshooting” on page 37 for
recommended actions.
9. The display will now alternate between the normal operation screen and the message
REMOVE CAL GAS
for 1 minute. If the calibration gas has not been removed from the
detector, remove it now to avoid unwanted alarms.
During this 1 minute period, the signal output will remain fixed at 3.5 mA and the relays
will remain in their non-alarm state to avoid unwanted alarms while the calibration gas
clears from the detector. At the end of the 1 minute period, the
REMOVE CAL GAS
message will stop appearing and the M2A will return to normal operation.
10. Disconnect the calibration adapter/splash guard’s flexible tubing from the regulator.
NOTE:
Do not disconnect the flexible tubing from the calibration adapter/splash
guard.
11. Store the components of the calibration kit in a safe place.
