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Combustible Gas Transmitter

ATI Model (A12-17)

The Auto-Test Combustible Gas Transmitter doesn’t require frequent maintenance or response checks. It provides a high level of reliability through its combustible gas detector system which conducts an automatic gas test on the sensing element every 24 hours –reducing manual testing.

General issues and standard methods:

Combustible gas detectors are used within industrial plants to detect gas leakage/build up before it reaches explosive levels. This is done via thermal oxidation of gas – burning the gas and measuring the heat released.

This standard method can require regular maintenance to prevent poisoning by silicon vapour, lead compounds, and other environmental contaminants.

How it works:

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.

As long as the active element remains in good condition, the sensor will respond rapidly to the presence of combustible gas.

Features and Benefits:

  • Auto-Test: The result of each auto-test is logged in transmitter memory. The hydrogen generator can be manually activated to observe sensor response.
  • Non-intrusive Calibration: Magnetic transmitter controls allow adjustments without removing enclosure cover.

Technical Specifications:

  • Range: 0-100% LEL
  • Response Time: (T90) 10 seconds
  • Accuracy: Generally ±5% of value, but limited by available calibration gas accuracy

Please download the technical documentation for further details.

More products like this? C12-17, D12-IR


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