35
65-2661RK-03-04 M2A Transmitter Operator’s Manual
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.
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 30 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.
Replacing Components of the 65-2661RK-03-04
This section includes a procedure to replace the hydrophobic membrane, the plug-in IR
CO
2
sensor, and the entire CO
2
detector assembly. In most cases, it is not necessary to
replace the entire detector assembly.
Replacing the Hydrophobic Membrane
1.
Turn off or disconnect power to the M2A.
2.
Unscrew the detector housing cap from the detector housing body.
3.
Gently pry up the edge of the white hydrophobic membrane with a small flat blade
screwdriver or a similar tool.
4.
Peel off the hydrophobic membrane. It may be necessary to clean off the detector
housing cap face to remove any residue left from the adhesive backed membrane.
5.
Install the new membrane in the recess on the face of the detector housing cap.
6.
Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
7.
Turn on the power to the controller.
8.
Turn on the controller and place it into normal operation.
