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    Fixed Combustible Gas Detector, 0 to 100%LEL

    5 out of 5 based on 6 reviews | Write a review
    Combustible gas detector is fixed to detect the flammable gas leakage and gives the alarm with sound and light. With real-time display and remote control, flammable gas detector is available with signal output 4-20mA and RS485, fast response and high accuracy.
    SKU: GD300-EX
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    Delivery date: 6-12 days

    Fixed combustible gas detector is 24-hour oneline to monitor the leakage of combustible gas 0 to 100% LEL, widely applied in the confined space, gas pipeline area, gas station, material spraying workshop, chemical industry, and other flammable and explosive gas storage area.


    • Adopting high precision sensor for accurate gas leak detection.
    • Equipped with 3-wire system 4-20mA and RS485 output, relay output, (optional).
    • Compatible with various controlled alarms, PLC, DCS and other control system, and can be remote monitored.
    • Explosion-proof design, fast, relaible and stable.
    • Infrared ray controller can remote control the alarm point settings, zero calibration, and address modification.
    • Two-stage alarm with sound and light, and the alarm point is settable.
    • With self-calibration function, and three standard keys will be used to realize on-site maintenance.
    • Can output one or two on-off signals, can drive ventilator, solenoid valve or other external devices.


    Model GD300-EX
    Detection Principle Catalytic Combustion
    Gas Combustible Gas (EX)
    Range (Optional) 0 to 100% LEL
    Resolution 1% LEL
    Accuracy ≤±3% F.S.
    Responce Time ≤10s
    Repeatability ≤±1%
    Recovery Time ≤10s
    Linearity Error ≤±1%
    Zero Shift ≤±1% (F.S./year)
    Signal Output (Optional) Note 4-20mA and RS485
    Relay output: one group of relay output (1NO+1NC, 24V 100mA) for one alarm (default), or two groups of relay output (2NO+2NC, 24V 100mA) for high/low alarm (optional).
    Alarms Sound, light
    Display High light nixie tube display
    Installation Wall-mounted, piping type, flow-type (according to the detected environment)
    Connection G1/2 is the inlet and outlet for power and signal lines
    Pipe-mounted type: The installation thread size of the instrument is M45*P2.0
    Operating Time 24h
    Explosion-proof Grade Ex d llC T6
    Protection Grade IP65
    Certification CE, ATEX
    Working Voltage 12~36V DC
    Case Material Die-casting aluminum housing
    Operating Temperature -20℃~50℃
    Operating Humidity 0~95%RH (non-condensing)
    Dimension 206*179*90mm
    Weight ≤1.6kg
    Accessories Power adapter: Input 100-240VAC 50/60Hz, Output 24VDC 2A (Optional USA plug & Europe plug)

    Note: To measure confined spaces such as pipelines, please contact us and inform the detailed conditions of use.

    Fixed Gas Detector Dimension (Unit: mm)

    Fixed gas detector with alarm dimension

    ***Other Common Gases and Ranges Available for Fixed Gas Detectors

    Gas Type Measure Range Resolution
    Ammonia (NH3) 0-50/100/200/500/1000ppm 0.01ppm/0.1ppm/1ppm
    Benzene (C6H6) 0-1/10/50/100/200/1000/2000/5000/10000ppm 0.001ppm/0.01ppm/0.1ppm/1ppm
    Carbon Dioxide (CO2) 0-1000/2000/5000/9999ppm, 0-1/5/100%VOL 0.1ppm/1ppm/0.001%VOL
    Carbon Monoxide (CO) 0-10/20/50/100/500/1000/2000ppm 0.01ppm/0.1ppm/1ppm
    Chlorine (Cl2) 0-10/20/50/100ppm 0.01ppm/0.1ppm
    Chlorine Dioxide (ClO2) 0-1/5/10/20/50/100ppm 0.001ppm/0.01ppm/0.1ppm
    Ethylene (C2H4) 0-50/100/500/1000/2000ppm 0.01ppm/0.1ppm/1ppm
    Formaldehyde (CH2O) 0-10/20/50/100ppm 0.01ppm/0.1ppm/1ppm
    Hydrocarbons (HC) 0-100%LEL 1%LEL
    Hydrogen (H2) 0-1000/2000/5000/9999ppm, 0-1/4%VOL 1ppm/0.001%VOL
    Hydrogen Chloride (HCL) 0-10/20/50/100/200ppm 0.01ppm/0.1ppm
    Hydrogen Cyanide (HCN) 0-10/20/50/100ppm 0.01ppm/0.1ppm
    Hydrogen Sulfide (H2S) 0-20/50/100/200ppm 0.01ppm/0.1ppm
    Methane (CH4) 0-50/100%VOL, 0-100%LEL 0.01/0.1%VOL/1%LEL
    Nitric Oxide (NO) 0-20/50/100/250/500/1000ppm 0.01ppm/0.1ppm/1ppm
    Nitrogen (N2) 0-100%VOL 0.01%VOL
    Nitrogen Dioxide (NO2) 0-20/50/100/500/1000ppm 0.01ppm/0.1ppm/1ppm
    Nitrogen Oxides (NOX) 0-1/5/10/20/50/100/250/500/1000ppm 0.001ppm/0.01ppm/0.1ppm/1ppm
    Oxygen (O2) 0-25/30%VOL 0.01%VOL
    Ozone (O3) 0-1/5/10/20/50/100ppm 0.001ppm/0.01ppm/0.1ppm
    Phosphine (PH3) 0-10/20/50/100/500/1000/2000/3000ppm 0.01ppm/0.1ppm/1ppm
    Sulfur Dioxide (SO2) 0-20/50/100/500/1000ppm 0.01ppm/0.1ppm/1ppm
    Volatile Organic Compounds (VOC) 0-1/5/10/20/50/100/200/500/1000/2000/5000/10000ppm 0.001ppm/0.01ppm/0.1ppm/1ppm
    Combustible Gas (EX) 0-100%LEL 1%LEL

    Note: Some common gases and the measuring ranges are listed in the above table. For more information, please feel free to contact us.


    Fixed Combustible Gas Detector Details

    Tips: Installation of Fixed Combustible Gas Detector

    The combustible gas detector is used for flammable gas leak detection and alarming. When the combustible gas leaks and the detector monitors that the gas concentration reaches the set critical point, the flammable gas detector will sound an alarm to remind the staff of taking measures, to prevent explosions, fires, and poisoning accidents, thus ensuring safe production. Once fixed combustible gas detector is installed in place, its position is not easy to change. Therefore, something should be noted before installing the detector.

    1. First of all, it is necessary to find out the place to be monitored where may be leaking points or prone to gas leakage, such as the interface of the pipeline, etc., and analyze the leakage pressure, direction and other factors.
    2. It also needs to judge the direction of leakage of combustible gas when a large number of leakage occurs according to the air flow direction, wind direction and other specific factors on site.
    3. According to the density of the leaked gas (greater or less than air) and the trend of air flow, the downstream position of the gas flow can be considered as the initial installation point.
    4. Figure out the leakage state of the leak point, micro leak or spray-like leak. If it is micro leakage, the combustible gas detector should be installed closer to the leakage point. If the leakage is spray-like, it should be installed slightly away from the leak point.
    5. The installation height of the outdoor gas detector can be selected according to the density of the measured gas. A very important thing to understand is that the detector should be installed on the downwind side.


    Gas Detector 3-Wire System

    In the realm of gas detection systems, the 3-wire configuration offers a robust wiring solution, especially for applications requiring analog output. This video will show you the 3-wire gas detector wiring.

    Gas Detector 4-Wire System

    The wiring of the 4-wire gas detector supports the RS485 interface Modbus RTU communication mode. This video will show you the 4-wire gas detector wiring.

    Using Cloud Data and 4G for Fixed Gas Detectors

    This video will show you about the applications of cloud data and 4G transmission for fixed gas detectors.

    Monitoring Combustible Gas in Pipelines

    This video will show you how to monitoring combustible gas in pipelines.

    Existing reviews of Fixed Combustible Gas Detector, 0 to 100%LEL
    Would this gas detector need to be protected against weather conditions?
    The gas detector would be mounted outside in various conditions, would not be mounted to the gas skid, but be mounted on its own stand to compensate for wind direction when in operation. Oil and gas drilling and completions operations. Would this gas detector need to be protected against weather conditions?
    From: Hahn | Date: 02/03/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    When installing a fixed gas detector outdoors, we recommend that you install a rain shield against weather conditions.
    Can we install the sensor 30 feet from the transmitter?
    I wanna know if I buy one gas detector LEL 0-100% with remote,also needs a calibration kit, the sensor can be replaced only? Can we install the sensor 30 feet from the transmitter?
    From: DeLisle | Date: 12/12/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Fixed Combustible Gas Detector 0 to 100% LEL, with remote control (the remote control distance is about 8-10 meters), and the sensor can be replaced individually. The calibration kit that comes with the Detector is a brass pressure-reducing valve.
    Perfect fixed combustible gas detector
    This fixed combustible gas detector is perfect, both in terms of shape and performance, it is the best. I've been using this gas detector for three months and haven't found any problems so far.
    From: Farrah | Date: 26/07/2022
    Was this review helpful? Yes No (0/0)
    Good fixed combustible gad detector
    The gas detector is fairly easy to use and understand. The C02 reads around 400ppm with my windows open and about 1500ppm after an 8 hour sleep with the windows closed so it seems fairly accurate.
    From: Mar | Date: 30/06/2022
    Was this review helpful? Yes No (0/0)
    Can I buy the sensor head separately?
    Can we buy the sensor head separately if needed in the future?
    From: Isrealg | Date: 18/01/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, you can, but the price is approximately 80% of the whole sensor price.
    My questions about the gas detector
    I am interested in the H2 analyzer you offer and would like to ask a few questions regarding the product:
    1. Do you know what the minimum flow rate is that the instrument operates at?
    2. Is the accuracy of the instrument with operating range 0-100% the same as what is described in the product description?
    3. Is there any cross sensitivity for other gases we should be aware of?
    4. Do you know what detection technology is used and how the calibration should be performed?
    Could I get a quote for the instrument that has an analysis range 0-100% please?
    From: Emmam | Date: 01/09/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    For your inquires below, here are the answers:
    1. The minimum flow rate is 500mL/min.
    2. Yes, the 0-100% accuracy of the instrument working range is as described in the product description.
    3. For the range 0-100%VOL, it can only be used in a single hydrogen environment, no other gas exists.
    4. Measurement technology is sensor semiconductor principle, calibration is with pure hydrogen 99.999%VOL standard gas calibration.
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