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Chapter 7: Maintenance
M2A-XL Transmitter Operator’s Manual
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).
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.
b. Install the regulator onto the cylinder.
c. 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-XL
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.
If calibrating a ClO
2
detector with a Cl
2
cylinder, multiply the Cl
2
concentration by 0.4 and
set the controller to that value (i.e. 2 ppm Cl
2
x 0.4 = 0.8 ppm ClO
2
).
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-XL 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 56 for
recommended actions.
