Emerson Net Safety ST3, Reference Manual

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3.5 Configure Net Safety Millennium II Basic
Transmitter
When using the Net Safety ST3 sensor with the Net Safety Millennium II Basic Digital
transmitter model (M2B-D), you can change the sensor's range by accessing a specific
Modbus
®
register.
Write to register 40027 using the preset single register command 0x06. Then enter the
desired range in the register. Refer to
Detection range for the available ranges.
When using the Net Safety ST3 sensor with the Net Safety Millennium II Basic Analog
(M2B-A), Analog/HART
®
(M2B-AH), and Relay (M2B-R) transmitter models you can change
the sensor’s range to facilitate the need to accurately detect different gas concentrations.
To do this, use the transmitter’s DIP Switch 2 positions as seen in
Hydrogen sulfide sensor
(Net Safety ST320) DIP switch settings and Carbon monoxide sensor (Net Safety ST360)
DIP switch positions . Select the transmitter’s DIP Switch 2 position that gives the range of
gas to be detected.
3.5.1 Detection range
Hydrogen sulfide (ST320) Carbon monoxide
(ST360)
Oxygen (ST341)
20 ppm, 50 ppm, 100 ppm 500 ppm, 1000 ppm 25% volume
3.5.2 Hydrogen sulfide sensor (Net Safety ST320) DIP switch
settings
Position 1 Position 2 Position 3 Position 4 Range (Setting)
ON OFF OFF OFF Range 1 (20 ppm)
OFF ON OFF OFF Range 2 (50 ppm)
OFF OFF ON OFF Range 3 (100
ppm)
3.5.3 Carbon monoxide sensor (Net Safety ST360) DIP switch
positions
Position 1 Position 2 Position 3 Position 4 Range(Setting)
ON OFF OFF OFF Range 1 (500
ppm)
OFF ON OFF OFF Range 2 (1000
ppm)
Reference Manual Operate
00809-0100-4303 November 2020
Net Safety ST3 21