User Manual

65-2649RK-HC-04 M2A Tran smitter Op erator’s Manual 16
WARNIN G : The M2A is not an active gas monitoring device during t he 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 out put signal will not i ndicate current readings
and the relays will not resume operating normally unti l 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 Param e ters” on page 22 for in structions to chang e
the calibration time -out.
1. While in n ormal operation, press and hold the UP/YES button for 5 second s to enter
Calibration Mode. Release the button when the following screen appears.
2. Press and release the UP/YES button to continue. The display wi ll indicate the target
gas and CAL Mode for a few secon ds before showin g FreshAir Adjust?.
3. Press and release the UP/YES button. ENTER will alternate with FreshAir on the top
display line a nd the current gas reading will be on the bottom display line.
4. Press and release the ENTER button. The M2A will perform a ze ro operation and th e
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 operat ion.
Calib?
YES/NO