RKI Instruments M2 Series User Manual
Page 29
M2 Transmitter Operator’s Manual
24
removing the wand is the same as pressing and releasing a button. Touching the glass and
keeping the wand in place is the same as pressing and holding a button.
WARNING:
The M2 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
for a toxic, combustible gas, or CO
2
M2, or at 17.4 mA for an oxygen M2,
and all relays will remain in their non-alarm state while the M2 is in
Calibration Mode. The output signal will not indicate current readings
and the relays will not resume operating normally until the M2 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 M2 Parameters” on page 30 for instructions to change
the calibration time-out.
Combustible Gas, CO
2
, and Toxic Versions, 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.
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 M2 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 M2 will return to normal operation.
Oxygen Version, 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.
Press and release the UP/YES button to continue. The display will indicate OXYGEN
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 oxygen reading will be on the bottom display line.
4.
Press and release the ENTER button. The M2 will perform a span operation and then
the display will indicate ZERO w/Cal Gas?.
5.
Press and release the DOWN/NO button. The display will indicate Leaving CAL
Mode
and the M2 will return to normal operation.
Calib?
YES/NO
Calib?
YES/NO