6
SD2-NH3
Wiring
Electrical wiring must comply with all applicable codes.
Electrical Power:
24 VDC regulated, 600mA.
Output:
Linear 4/20 mA output. Monitoring equipment may have a
maximum input impedance of 700 ohms.
Cable Recommendation:
18/3 shielded, stranded cable (General Cable
C2535A or equivalent). Length of cable to sensor should be no greater than
1,000 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:
• 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.
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
Figure 2
