RKI Instruments M2 for 12 VDC - Manual (Page 16)

11 M2 Transmitter Operator’s Manual, 12 V DC Operation
8. Re-install the control PCB (and ribbon cable if necessary). Be sure the ribbon cable is
routed down below the control PCB so it will not be damaged by the cover when it is
screwed back on.
9. Secure the junction box cover to the junction box.
10. Make controller, device, and relay connections as appropriate. If shielded cable is
used for the PWR/SIG connections, connect the cable shield’s drain wire to an
available chassis ground at the gas monitoring controller, recording device, or
programmable controller.
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
M2.
5. The LCD display will indicate the firmware version when the M2 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.
CAUTION: Allow the M2’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 M2 is shipped from RKI Instruments, Inc. it is factory calibrated. If a full
calibration is desired at startup, see “Calibration” on page 25.
Verify that the M2 is in a fresh air environment (environment known to be free of the
target gas and combustible or toxic gas vapors and of normal oxygen content, 20.9%).
CAUTION: If you suspect the presence of combustible gas, toxic gas, or that the oxygen content
is not normal 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 “Calibration” on page 25 for instructions on how to
use a zero air cylinder when performing a fresh air adjustment.
Non-Intrusive Fresh Air Signal Adjustment
If the M2 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
METHANE
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