SGOES Infrared Combustible Gas Detector
820-0006
Operating Manual
Page 14
General Wiring Requirements
Caution: All cable/conduit entries must be sealed with an appropriate and
certified sealing plug and cable gland. The use of industrial grade, armored
field cable is recommended. If installing the sensor in a hazardous area using
remote configuration, armored cabling is required for the detector connection
to the SGOES.
•
If installing connection cables in an explosion proof conduit, do not use the same conduit to carry
wiring for any other purpose or equipment.
•
If installing the SGOES in a hazardous area, armored cabling is required for the connections to the
SGOES
•
Minimum 14 AWG (2.08 mm
2
) shielded cable conductors are required for optimal performance.
•
When using Modbus, twisted pair wiring is required for both the power and signal wires. Each
pair must be shielded to eliminate electromagnetic interference.
For reliable communications between the SGOES and the Host master, connect the Host RS-485
common or signal ground to the SGOES RS-485 common terminal. This is especially important
when connecting to an isolated RS-485 port. Failure to do so could result in communications
failures and possible damage to either the Host or SGOES RS-485 transceivers.
Terminal No Label Description
1 +24V DC (DC power input)
2 0V System Ground
3 +24V DC (DC power input)
4 OV System Ground (common) -4-20mA
5 420 +4-20mA (current output signal)
6 485A RS-485 A (Modbus RTU output signal)
7 485B RS-485 B (Modbus RTU output signal)
8 FLT Fault alarm relay, pin 1(NORMALLY CLOSED when energized)
9 FLT Fault alarm relay, pin 2 (COMMON)
10 FLT Fault alarm relay, pin 3 (NORMALLY OPEN when energized)
11 A1 Alarm Relay 1, pin 1 (NORMALLY CLOSED)
12 A1 Alarm Relay 1, pin 2 (COMMON)
13 A1 Alarm Relay 1, pin 3 (NORMALLY OPEN)
14 A2 Alarm Relay 2, pin 1 (NORMALLY CLOSED)
15 A2 Alarm Relay 2, pin 2 (COMMON)
16 A2 Alarm Relay 2, pin 3 (NORMALLY OPEN)
