Detcon 700 Series Remote Sensor/Alarm Relay Module With HART Interface - Manual (Page 7)

700 HART-RAM I.M.
connectors (Figure 5). To install the electronics package, properly align the plug-in connector and gently
push the HART-RAM in until it is fully seated to the bottom PCA. The HART-RAM faceplate will be even
with the top of the junction box when installed properly. The HART-RAM top should be flush with the top
of the enclosure before screwing down the junction box cover.
The RAM display and
HART bridge
External Wiring
12-Pin Plug-In
Connector
Input Port
The terminal
board sets on
the stand-offs in
the enclosure
Provide at least
a 6" Service
Loop for all
wiring
6"
Input Port
Figure 4 Exploded View of Assembly
1.3 Field Wiring
The field wiring connections are made to the bottom PCA (terminal board) of the HART-RAM using a series
of connector blocks. There is a 6-pin terminal block for connection to the 700 Gas Sensor (labeled
SENSOR), a 9-pin terminal block for connection to the 3 relay contacts (labeled RELAY OUTPUT), a 6-pin
terminal block for connection of power, mA/HART output and Modbus™ interface to the host device
(labeled IN) and a 6-pin terminal block for connection of power and Modbus™ interface to an additional
device (labeled OUT).
700 Sensor
Connections
ALM1 ALM2 FLT
NO NC COM NO NC COM NO NC COM
J7
J2
J1
J4
IN
SENSOR
OUT
+
+ mA A B
mA
A
B +
A
B
K1
K3
K2
Input Power and
mA/HART Output
Alarm Relay
Connections
Output
Power
Modbus ™
Interface to Host
Modbus ™
Interface
U1
Figure 5 Interface connections on terminal board
NOTE: The connectors on the HART Bridge are not to be used.
700 HART-RAM I.M. Rev. 0.0 Page 3 of 24