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    What are the Types of Gas Detectors?

    We live in a world that needs gas detectors. Chemical production such as gas, LPG, natural gas units and oil and gas fields, mining detection and alarms as well as life cannot do without it. They can detect the presence of many gases that we can't feel and perform many other tasks that make our lives easier and less stressful. In this article, the sisco store will introduce the classification and application of gas detectors in detail.


    • According to the different environments, gas detectors can be divided into explosion-proof gas detectors and non-explosion-proof gas detectors, which can be confirmed according to the explosion-proof marking on the product nameplate.
    • According to different installation methods, gas detectors can be divided into fixed gas detectors and portable gas detectors. Fixed gas detectors are installed at a specific location at the detection site, while portable gas detectors are those that can be carried around. 
    • Based on the difference in detection purpose, gas detectors can be categorized into combustible gas detectors and toxic gas detectors. 
    • Depending on how they are installed and wired, gas detectors can be divided into two types: split-wire gas detectors (3-wire), bus gas detectors (2-wire or 4-wire), and stand-alone gas detectors.

    Detailed Types

    Explosion-Proof Gas Detector

    An explosion-proof gas detector is a device installed with high-precision, anti-poisoning imported sensors. Explosion-proof gas detectors combustible samples the electrical signals from the sensor, and after internal data processing, outputs a current signal or modbus signal corresponding to the gas concentration in the surrounding environment.

    three types of gas detectors

    Portable Gas Detector

    Portable gas detectors, with over-range protection, can be widely used in natural gas, petroleum, chemical, metallurgical coking, and other industries for the production of gas or toxic gases, and the use of site detection. A portable gas alarm for handheld, staff can carry, detecting different locations of the combustible gas concentration, set the controller detector in one.

    Fixed Gas Detector

    Fixed gas detectors are generally used in places where long-term monitoring of the environment is required, such as underground coal mines, oil and gas pipelines, etc. Usually, multiple fixed gas detectors are arranged on-site and linked with the alarm system, such as in the detection of reaching the alarm threshold, the fixed gas detector will notify the relevant personnel by voice, text message, alarm, and other means.

    Combustible Gas Detector

    A combustible gas detector is a detector that responds to the concentration of single or multiple combustible gases. A combustible gas detector is a point-type gas detection equipment installed in explosive hazardous environments, which converts the on-site combustible gas concentration into an electrical signal and transmits it to the monitoring equipment located in the safety zone, to achieve the purpose of monitoring the on-site combustible gas concentration.

    Toxic Gas Detector

    It is used to detect toxic gases in the surrounding atmosphere and play the role of safety warning. Toxic gas detectors are divided into intrinsically safe toxic gas detectors and explosion-proof toxic gas detectors. Intrinsically safe products can be used in highly hazardous environments.


    Petrochemical: Many chemical and petrochemical plants require gas detectors to detect gas leaks and explosion risks. For chemical leaks caused by operational errors, equipment failures, etc., gas detectors can detect them in time and send out alarm signals to alert on-site staff to take timely measures to ensure the safety of the plant.gas detectors applications

    Environmental Protection: Gas detectors are widely used in the field of environmental protection. For example, in the city, water plants, chemical factories, and other places where the waste gas needs to be treated deeply, gas detectors can help detect whether the various toxic gases exceed the standard to ensure air quality.

    Marine Industry: Gas detectors are also widely used by the marine industry. Inside a ship, there may be gas or other harmful gases as well as a lack of oxygen, which can pose a threat to the lives of the crew. Gas detectors can detect these problems and send out alarm signals to alert the crew to take timely action.

    Mining: Gas detectors are also frequently used in the mining industry. The coal mine transit or mining process may produce instant high concentrations of methane and other gases, gas detectors can detect these gases in time, effectively avoiding the occurrence of mine accidents.

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