C12-17 Combustible Gas Detector

ATi’s C12-17 Combustible Gas Detector is a stand-alone gas transmitter designed to detect potentially hazardous concentrations of combustible gases in ambient air.

Reliable detection of hazardous concentrations of combustible gases

ATi’s C12-17 Combustible Gas Detector is a stand-alone gas transmitter designed to detect potentially hazardous concentrations of combustible gases in ambient air. Gases and hydrocarbon vapors, such as methane, propane, butane, gasoline, toluene, hydrogen and many others, can be reliably monitored in process buildings, analyzer enclosures, pump stations, gas compressor stations or anywhere gases or vapors may build up to explosive levels. 

C12-17 Combustible Gas Detectors are three-wire transmitters available as either a blind transmitter or with integral LCD display that provides local indication of gas concentration, visible through the glass window in the explosion-proof housing. Gas transmitter units supplied with the integral display also contain a single alarm set-point and relay for local alarm purposes. This integral relay is a latching alarm that can be reset with a magnetic tool without opening the enclosure. 

C12-17 gas transmitters can be connected directly to PLC, DCS, or computer-based alarm systems without additional hardware. Combustible gas sensors are made up of two matched sensing elements, one active and one passive. Both are electrically heated and form two legs of a Wheatstone bridge circuit. When combustible gas contacts the sensor, the active element catalyzes the oxidation of gas heating the active element and changing its resistance. The passive element remains unchanged, resulting in a change in the bridge circuit that is proportional to the gas concentration. The C12-17 Combustible Gas Transmitter has explosion-proof sensor assemblies that are made of 316 stainless steel for maximum corrosion protection. A sinter bonded flame arrestor provides the gas diffusion path to the sensing elements while maintaining the flame-proof integrity of the assembly. Sensing elements are specially designed for maximum poison resistance and long life in harsh industrial environments, with sensor life typically 2 years or more.

Features & specification

  • Gas Type: Calibrated for methane unless otherwise ordered.
  • Display: 3-digit LCD optional
  • Range: 0-100% LEL
  • Response Time (T90): 10 seconds
  • Accuracy: on average ±5% of value
  • Electronic Repeatability: ±1%
  • Electronic Linearity: ±0.5%
  • Zero Drift: Less than 2% full scale per month
  • Span Drift: Less than 3% per month
  • Output: Powered 4-20 mA, 675 ohms maximum at 24 VDC
  • Power: 12-30 VDC, 100 mA maximum
  • Enclosure: Explosion-proof, Class 1, Div 1, Groups B, C, & D
  • Alarm: Optional single alarm available
  • Alarm Relay: SPDT, 5 Amp @ 220 VAC non-inductive, latching
  • Sensor: 316 stainless steel
  • Controls: Potentiometer zero and span adjustment, Potentiometer alarm setpoint adjustment, Magnetic reset switch for latching alarm relay
  • Operating Temperature: -40° to +70°C
  • Weight: 3 lbs (1.3 kg)


The C12-17 Combustible Gas Detector is available for a wide range of applications including:

  • Process buildings
  • Analyzer enclosures
  • Pump stations
  • Gas compressor stations

Key benefits

  • Designed to detect potentially hazardous concentrations of combustible gases in ambient air
  • Connection to PLC, DCS or computer-based alarm systems without additional hardware
  • Explosion proof sensor assemblies



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