RKI Instruments 65-2649RK-HC-04 - Manual (Page 20)

15 65-2649RK-HC-04 M2A Transmitter Operator’s Manual
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.
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 32.
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 combustible gas 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 32
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.
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