RKI Instruments M2A - Manual (Page 49)

M2A Transmitter Operator’s Manual 44
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 M2A will return to normal operation.
2. Screw the calibration gas cylinder into (onto for an H
2
S cylinder) 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 it.
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 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 39 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. Store the components of the calibration kit in a safe place.