RKI Instruments 65-2640RK-04 - Manual (Page 20)

15 65-2640RK-04 M2A Transmitter Operator’s Manual
See Figure 7 below for field wiring connections to the M2A.
Figure 7: Wiring the M2A Junction Box to a Controller and Alarm Devices
16. 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.
17. Secure the M2A junction box cover to the junction box.
18. 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.
Alarm 1
Alarm Device
Fail Alarm
Device
Alarm Device
Power
Typical Alarm
Wiring Shown
(24 VDC) -
4 - 20 mA In (S)
(24 VDC) +
RKI Controller
Terminals
-
S
+
A
B
C
RS
485
PW
R
/SI
G
R
W
G
B
LE
L
See
Detector
Wiring
Alarm 2
Alarm Device
C
NC
N
O
AL
AR
M 1
C
NC
N
O
AL
A
R
M
2
C
NC
N
O
FA
IL
See
Modbus
Wiring