65-2646RKS-SW M2A Transmitter Operator’s Manual
Chapter 3: Installation & Startup
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5. The OLED display will indicate the firmware version when the M2A is first powered up and
will then count down a one minute warm-up period before normal operation begins. During
normal operation, the display will indicate the target gas and current gas reading. Verify that
the display is indicating the target gas and current gas reading after the warm-up period is
complete and normal operation begins.
NOTE:
Allow the M2A’s detector to warm up for 15 minutes before you continue
with the next section, “Adjusting the Fresh Air Reading.”
Adjusting the Fresh Air Reading
When the M2A is shipped from RKI Instruments, Inc., it is factory calibrated. If a full calibration
is desired at startup, see “Calibration” on page 36.
Verify that the M2A is in a fresh air environment (environment known to be free of combustible
or toxic gas vapors and of normal oxygen content, 20.9%).
CAUTION:
If you suspect the presence of carbon monoxide in the monitoring environment, use
the calibration kit and the zero air calibration cylinder to introduce “fresh air” to
the detector and verify an accurate fresh air setting. See the “Calibration” on
page 36 for instructions on how to use a zero air cylinder when performing a fresh
air adjustment.
Non-Intrusive Fresh Air Signal Adjustment
If the M2A is installed in a classified area and non-intrusive zero adjustment is required, follow
the instructions below,
but do not remove the junction box cover
. Use the magnetic wand
accessory to actuate the magnetic switches instead of pushing the control switch buttons. To
actuate a magnetic switch and perform the same operation as pressing a control switch button,
touch the magnet in the end of the magnetic wand to the M2A’s glass cover directly over the
magnetic switch you wish to actuate. Touching the glass and 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 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.
CO
0 ppm