RKI Instruments 65-2641RK-04 - Manual (Page 40)

35 65-2641RK-04 M2A Transmitter Operator’s Manual
Response Time” on page 32.
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 the Hydrogen Detector
1. Turn off or disconnect power to the M2A.
2. Remove the detector junction box cover.
3. Unscrew the calibration adapter/splash guard from 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 box.
6. Guide the detector leads of the replacement detector through the bottom conduit hub
of the detector junction box, then screw the mounting threads of the detector into the
conduit hub. If necessary for environmental conditions, apply thread sealant or teflon
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 13).
8. Screw the calibration adapter/splash guard onto the new detector.
9. Reinstall the detector junction box cover.
10. Turn on or plug in power to the M2A.