Detcon 700 Remote Sensor/Alarm Relay Module - Manual (Page 8)

700 RAM I.M.
necessary to install/use the Transient Protection Module shipped with the 700 sensor. The 700 sensor may
arrive from the factory pre-assembled with the RAM in the j-box, but only if it is ordered in this
configuration. In this configuration, the wires from the 700 sensor will be directly connected to the 6-pin
terminal block labeled “SENSOR” on the terminal board.
NOTE: If the 700 sensor and RAM are directly connected, it is not necessary to install/use the
Transient Protection Module that is shipped with every 700 Gas Sensor.
PGM2
SPAN
detcon inc.
MODEL XX-700
PGM1
ZERO
Sensor
Power Input
mA Output
Modbus ™ Interface
Fault
Annunciator
Alarm 1
Annunciator
Alarm 2
Annunciator
Figure 6 Installation with 700 Gas Sensor
If remote sensor separation is required, the RAM will be separated from the 700 sensor. Remote separation
distances of up to 1000 feet are possible with the recommended cables.
NOTE: It is highly recommended to install the interconnecting cabling inside rigid metal
conduit to eliminate potential EMI and RFI interference.
mA Output
700 RAM
Module
Cabling to/from
Remote 700 Sensor
Remote 700 Sensor
Transient Protection
Module in Detcon
standard J-Box
Power Input
Sensor
detcon inc.
MODEL
XX-700
PGM1
ZERO
PGM2
SPAN
Modbus ™ Interface
Power & Modbus ™
Figure 7 Remote 700 Gas Sensor with RAM
The recommended cable for remote sensor separation is Belden 8770 (18AWG shielded 3-wire cable) for
connection of power and mA signal return and Belden 9841 (24AWG shielded twisted pair) for serial
Modbus™ communications.
700 RAM I.M. Rev. 1.0 Page 4 of 13