6
GG-NH3
Wiring
Electrical wiring must comply with all applicable codes.
Electrical Power:
24 VDC regulated, 350 mA.
Output:
Linear 4/20 mA output. Monitoring
equipment may have a maximum input impedance of
700 ohms.
Cable Recommendation:
20/3 shielded cable
(General Cable C2525A or equivalent). Length of cable
to sensor should be no greater than 1,500 feet.
Monitoring:
Monitoring equipment must be
configured to indicate a fault if the signal is below 1
mA. All signals over 20 mA must be considered high
gas concentrations. Alarm setpoints should not be
lower than 10% of full-scale range.
Wiring Guidelines:
• Always use 3-conductor, insulated, stranded,
shielded copper cable.
• Do not pull sensor wiring with AC power cables.
This can cause electrical interference.
• If cable runs cannot be made without a splice, all
splice connections should be soldered.
• Ground the shield at the main control panel.
Connect the shield wire in the sensor terminal
block labeled
SHLD
.
• Always disconnect power at the controller before
performing any wiring at the sensor.
• To maintain NEMA/IP rating of the enclosure,
conduit fittings of the same rating or better must
be used.
To signal input of monitoring equipment
To +24V terminal of power supply
To ground terminal of power supply
To case (earth) ground of monitoring equipment
Terminal Block Plug (Field Wiring):
SHLD: To case (earth) ground of monitoring equipment
GND: To ground terminal of power supply
+24V: To +24V terminal of power supply
SIG: To signal input of monitoring equipment
