Table 2-3: Sensor Wire Colors and Terminal Definitions
Wire color
Marking
Function
White
+Vdc
10.5 to 32 Vdc connection
Red
Signal A
Signal A
Blue
Signal B
Signal B
Black
COM
Common/supply ground
Green
N/A
Earth ground
2.6.5
External ground
In order to ensure proper operation of the sensor, Net Safety recommends connecting an
external ground screw to the grounding point on the enclosure.
2.7
Calibration
Note
Power up the Net Safety ST3 sensor for at least 24 hours before completing the first
calibration.
Although Emerson calibrated the sensor at the factory, this calibration may have been
disrupted after shipment, and calibration after installation is necessary to ensure
performance.
To ensure proper operation of Net Safety ST3, Emerson recommends calibrating hydrogen
sulfide sensors every six months and calibrating carbon monoxide or oxygen sensors every
three months.
Net Safety Millennium II Multi-Channel Transmitter Reference Manual
Net Safety Millennium II Basic Transmitter Reference Manual
for the calibration
procedure.
Install
Reference Manual
November 2020
00809-0100-4303
18
Emerson.com/FlameGasDetection
