65-2670-XX-04 M2A Transmitter Operator’s Manual
21
2. 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.
3. Secure the M2A junction box cover to the junction box.
4. 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 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.
Figure 9: Wiring the M2A to a Controller and Alarm Devices
+
Alarm Device
Power
-
S
+
PW
R
/SI
G
Fail Alarm
Device
Alarm 1
Alarm Device
Typical Alarm
Wiring Shown
A
B
C
RS
4
8
5
RKI Controller
Terminals
(24 VDC) +
4 - 20 mA In (S)
(24 VDC) -
T
O
X
IC
O
X
Y
See
Modbus
Wiring
See
Detector
Wiring
C
N
C
N
O
AL
A
R
M
1
C
NC
NO
AL
A
R
M
2
C
NC
NO
FA
IL
Alarm 2
Alarm Device
+
NH3
0 ppm
