M2A Transmitter Operator’s Manual
53
2. For combustible gas and CO
2
detectors:
a. Screw the calibration gas cylinder onto the fixed flow regulator.
b. Turn the regulator knob counterclockwise to open the regulator (or start the flow of gas from a
generator).
c. Continue to Step 4.
3. For toxic sensors:
a. It is important to vent the regulator while installing it onto the cylinder. Venting the regulator during
installation helps prevent air from getting into the cylinder and degrading the gas. Open the regulator by
turning the knob counterclockwise.
a. Install the regulator onto the cylinder.
b. Continue to Step 4.
4. Allow calibration gas to flow for two minutes. The gas reading should be stable after two minutes.
5. Turn the regulator knob clockwise to close it (or stop the flow of gas from a generator).
6. Unscrew the calibration gas cylinder from the fixed flow regulator and unscrew the calibration cup from the
detector. For an ESM-01 detector, pull the calibration cup off of the ESM-01 sensor and screw the
splashguard back onto the detector housing cap. 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. a 0 - 300 ppm CO detector must be calibrated with a CO concentration between
30 and 300 ppm).
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 48 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. Store the components of the calibration kit in a safe place.
www.
.com
1.800.561.8187
