65-2640XL-04 M2A Transmitter Operator’s Manual
Chapter 3: Installation & Startup
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23
WARNING: The M2A is not an active gas monitoring device during the fresh air adjustment
procedure. The 4-20 mA output signal will “freeze” at 3.5 mA and all relays will
remain in their non-alarm state while the M2A is in Calibration Mode. The
output signal will not indicate current readings and the relays will not resume
operating normally until the M2A is in normal operation again.
NOTE:
While in the calibration program, if there is no switch activity for the calibration time-
out period the unit will return to normal operation. The factory set time-out is 15
minutes. If you want a different time-out period, see “Viewing & Changing M2A
Parameters” on page 29 for instructions to change the calibration time-out.
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. Press and release the UP/YES button to continue. The display will indicate the target gas and
CAL Mode
for a few seconds before showing
FreshAir Adjust?
.
3. 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.
4. Press and release the ENTER button. The M2A will perform a zero operation and the display
will indicate
SPAN w/Cal Gas?
.
5. Press and release the DOWN/NO button. The display will indicate
Leaving CAL Mode
and
the M2A will return to normal operation.
Calib?
YES/NO
