RKI Instruments M2 for 12 VDC - Manual (Page 32)

27 M2 Transmitter Operator’s Manual, 12 V DC Operation
8. Unscrew the zero air cylinder from the fixed flow regulator leaving the calibration cup
on the detector. The M2 will continue to display the minimum gas response on the
display and retain the response level in its memory.
9. Press and release the ENTER button. The M2 will perform a fresh air adjustment and
the display will indicate SPAN w/Cal Gas?.
NOTE: If the fresh air adjustment fails, see “Troubleshooting” on page 23 for
recommended actions.
Adjusting the Span Setting
1. If you want to continue with adjusting the span setting, press and release the UP/YES
button. APPLY will alternate with SPAN Gas on the top display line and the current
gas reading will be on the bottom display line.
If you want to skip adjusting the span reading, press and release the DOWN/NO
button. The display will indicate Leaving Cal Mode and the M2 will return to normal
operation.
2. Screw the calibration gas cylinder into the fixed flow regulator.
3. Turn the regulator knob counterclockwise to open the regulator.
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 the regulator.
6. Unscrew the calibration gas cylinder from the fixed flow regulator and unscrew the
calibration cup from the detector. The M2 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 M2 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 23 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 M2 will return to normal
operation.
10. Store the components of the calibration kit in a safe place.