RKI Instruments M2 Series User Manual
Page 47
M2 Transmitter Operator’s Manual
42
Adjusting the Fresh Air Reading
1.
While in normal operation, press and hold the UP/YES button for 5 seconds to enter
Calibration Mode. Release the button when the following screen appears.
2.
If you want to continue with calibration, press and release the UP/YES button. The
display will indicate the target gas and CAL Mode for a few seconds before showing
FreshAir Adjust?
.
If you want to exit Calibration Mode, press and release the DOWN/NO button. The
M2 will indicate Leaving CAL Mode and the M2 will return to normal operation.
3.
To continue with adjusting the fresh air reading, press and release the UP/YES button.
ENTER
will alternate with FreshAir on the top display line and the current gas
reading will be on the bottom display line.
To skip adjusting the fresh air reading, press and release the DOWN/NO button. The
display will indicate SPAN w/Cal Gas?. Skip to the next section, “Adjusting the Span
Setting”.
4.
Screw the zero air cylinder into the fixed flow regulator.
5.
Turn the regulator knob counterclockwise to open the regulator.
6.
Allow zero air to flow for two minutes. If there was gas present causing a reading on
the M2, the reading should decrease and stabilize after two minutes.
7.
Turn the regulator knob clockwise to close the regulator.
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 38 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 (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.
Calib?
YES/NO