Emerson Net Safety ST3, Reference Manual

Page: 22 / 32

3.6 Fault conditions
The Net Safety ST3 sensor provides a number of fault conditions that the Net Safety
Millennium II transmitter translates into an analog or fault relay output. These fault
conditions are outlined in
Table 3-1 .
Table 3-1: Fault Conditions
Fault condition Analog output Fault relay output
Sensor zero drift 2.5 mA Fault
Memory fault 2.5 mA Fault
Sensor nearing end of life Alternating 2.5 mA for 10
seconds and normal level for 50
seconds Alternating 2.5 mA for 10
seconds and normal level for 50
seconds
Calibrate sensor 2.5 mA Fault
Operate Reference Manual
November 2020 00809-0100-4303
22 Emerson.com/FlameGasDetection