User Manual

65-2649RK-HC-04 M2A Tran smitter Op erator’s Manual 34
Resp onse Time” on page 31.
5. Turn the regulator k nob clockwise to close it.
6. Unscrew the calibratio n ga s 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 w ill perf orm 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 29 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 h as not been removed from
the detector, remove it now to avoid un wanted 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 cali bration adapter/splas h gua rd’s flexible tubin g from the regulator.
NOTE: Do not disconnect the flexible tubing from the calibration adapt er/spla sh guard.
11. Store the components of the calibration kit in a safe place.
Replacing the IR LEL Detector
1. Turn off or disconnect power to the M2A.
2. Remove the detector junction box cover.
3. Unscrew the calibration adapter/splash guard fro m the detector.
4. Disconnect the detector leads from the terminal block in the detector junction box.
Note the position of the color-coded leads as you remove them.
5. Unscrew the detector from the detector junction bo x.
6. Guide the detector leads of the replacement detector through the bottom conduit hub
of the detector junction box, then screw the moun ting threads of the detector int o the
conduit hub. If necessary for environmental condi t io ns , appl y thread seal an t o r t ef lo n
tape to the hub and/or detector threads to seal them.
7. Connect the detector leads to the terminal block the same way the old detector was
wired (see Figure 6 on page 12).
8. Screw the calibration adapter/splash guard onto the new detector.
9. Reinstall the d etector junct ion bo x cover.
10. Tu rn on or plug in powe r to the M2A .