CH-A3 Alphasense 2.5% Pellistor Gas Sensor

CH-A3 Alphasense Pellistor Gas Sensor
Regular price $159.00

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The CH-A3 Alphasense Pellistor Gas Sensor (formerly known as AP-0012) detects low levels of flammable hydrocarbon gases including methane, ethane, propane, butane, acetylene, ethylene and isobutylene in ambient air.

This 20mm diameter sensor is the industry standard size for portable gas detectors. All pellistors are housed in certified flameproof chambers.

For Sensor Tube Caps, please look under the "Accessories" Tab


  • 0 to 100% LEL methane
  • High quality, low power
  • Excellent poison resistance


  • Measuring Gas: methane
  • Sensing Method: Pellistor
  • Sensivity (mV / % methane): 15 to 22
  • Response time (t90 from air to 50% methane): < 15 sec.
  • Zero (mV in zero air) < ± 20mV
  • Range (% LEL methane): 0 to 100
  • Linearity (% methane when 5% non-linear): 6%


  • 90 Days. See CO2Meter Terms and Conditions.
Tube cap adapters easily convert 20mm standard gas sensors from diffusion to sampling sensors. Molded polymer grips sensor for easy fit and removal while maintaining a good seal.

Micro-Pump Kit includes all the tools you need to urilize the tube-cap adapters as part of a sampling sensor system.

Nafion tubing is a highly selective, semi-permeable membrane to water vapor. If gases inside Nafion tubing are wetter than gases surrounding the tubing, drying will occur. If the surrounding gases are wetter, humidification will occur.

Micro gas sampling pumps provide a constant flow of air across the sensor with a tube cap - perfect for bench-top testing of sensors for closed-loop sampling applications.

Sensor Pin Sockets - Manufacturers do not recommend soldering to the pins. Pin sockets can be purchased from Andon distributors. Click here to see the PDF of all AlphaSense sensors pin sockets, find your sensor brand, then find and search for the Andon part number for your sensor.

  • Data Sheets

  • Manuals

  • Technical Documents

  • Videos

  • Additional Resources

  • Case Studies

Customer Reviews

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"Easy to install, easy to set up, and easy calibration - just what I was looking for."

- Phillip Farrar
Water Plant Superintendent

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