CTI GG-VL2-NH3, Installation And Operation Manual

6

GG-VL2-NH3

Wiring

Electrical wiring must comply with all applicable codes. 

Electrical Power:

 24 VDC regulated, 80 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. 

Wiring Guidelines:

•  Use only the existing conduit hole for connections 

to the sensor.

•  Always use three-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.

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