65-2658XL-CH4-4 M2A-XL Transmitter Operator’s Manual
Chapter 3: Installation & Startup
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21
Start Up
Introducing Incoming Power
1. Complete the installation procedures described earlier in this manual.
2. Verify that all wiring connections are correct and secure.
3. Turn on the incoming power.
4. If necessary, turn on the controller or other monitoring device that is connected to the M2A-
XL.
5. The OLED display will indicate the firmware version when the M2A-XL 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-XL’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-XL is shipped from RKI Instruments, Inc., it is factory calibrated. If a full
calibration is desired at startup, see “Calibration” on page 38.
Verify that the M2A-XL is in a fresh air environment (environment known to be free of
combustible or toxic gas vapors and of normal oxygen content, 20.9%).
Non-Intrusive Fresh Air Signal Adjustment
If the M2A-XL 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-XL’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-XL 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-XL is in Calibration
Mode. The output signal will not indicate current readings and the relays will not
resume operating normally until the M2A-XL is in normal operation again.
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