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H2S Gas Detector – S4100T

Gas Detector
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H2S Gas Detector – S4100T

H2S Gas Detector – General Monitors S4100T

The S4100T H2S Gas Detector is a highly reliable, self-contained, microprocessor-controlled hydrogen sulphide transmitter with integral 3 digit readout.

It is designed to measure and display concentrations of H2S in the 0-20 ppm, 0-50 ppm or 0-100 ppm range, but will continue to display concentrations up to 120%. The sensing element may be incorporated in the transmitter housing or remotely mounted at distances of 600 meters. The sensor employs thin film metal oxide semiconductor (TFMOS) technology as the measuring principle.


  • RS-485 Dual Modbus Serial Output in addition to 4-20mA provides measurement, setup and status of up to 247 nodes
  • User changeable H2S range makes calibration with non-standard gas concentrations possible
  • Three (3) digit LED displays up to 120% full scale and alarm status
  • Fully adjustable alarm levels with open collector outputs lower wiring costs and flexible operation
  • Single point calibration for easy, fast, and simple single person calibration
  • Sensor can be remotely mounted up to 600 meters from transmitter for increased installation flexibility
  • Remaining sensor life indication facilitates preventative maintenance schedule
  • EEx-e (increased safety) approval provides high level of water ingress protection for harsh environments


  • Refineries
  • Drilling rigs and platforms
  • Gas collection and distribution facilities
  • Oil and gas production platforms
  • Mud-logging operations
  • Sulfur recovery / de-sulfurization facilities
  • Chemical plants
  • Wastewater treatment facilities
  • Heavy water nuclear facilities
  • Well head sites