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Net Safety Millennium II ST3 XChem Toxic Gas Sensor [Electrochemical]
The Millennium II ST3 XChem series of electrochemical toxic gas sensors provide high specificity, fast response, and long life.
All ST3 sensors are part of the universal Millennium II Gas Detection platform and are compatible with the M21, M22, and M2B transmitters. Our latest design employs our “SimpleClick” sensor element design and low power consumption.
Net Safety Millennium II ST3 XChem Toxic Gas Sensor [Electrochemical]


Operating Temperature
H2S: -40 °F to +140 °F (-40 °C to +60 °C)
CO: -4 °F to +122 °F (-20 °C to +50 °C)
O2 -4 °F to +122 °F (-20 °C to +50 °C)
Enclosure Rating
Stainless Steel: 3.5 lbs (1.4 kg)
1 lb (0.4 kg)
Humidity Range
15-90% non-condensing
Class I Division 1 Groups BCD T5
Ex d IIB+ H2 T5
Class I Zone 1 AEx d IIB +H2 T5
Ex d IIB+H2 T5 Gb
2 years


  • Sensor end of life diagnostic
  • Plug and play design where the transmitter automatically recognizes sensor configuration
  • Low power consumption increases uptime
  • Two year warranties available on most sensors
  • Field selectable gas ranges
  • Designed to perform in the most extreme industrial environments


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