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    Fixed Hydrogen (H2) Gas Detector, 0 to 1000/2000/5000 ppm

    5 out of 5 based on 5 reviews | Write a review
    Affordable price hydrogen gas detector for sale. Optional measuring range 0-1000/2000/5000 ppm, max 10000 ppm, supports remote control with output signal 4-20mA or RS485, high accuracy 3% F.S. H2 gas leak detector for hydrogen concentration detecting with sound & light alarm, fixed design, compact structure.
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    Delivery date: 6-12 days

    Fixed gas detector from reliable manufacturer, applicable gas hydrogen. Detecting range 0-1000/2000/5000/10000 ppm, real time display, sound and light alarm, remote control, output signal 4-20mA or RS485. H2 gas detector for detecting and monitoring hydrogen leak in 24 hours, small size, high reliability, acceptable price.


    • Hydrogen gas detector adopts high precision sensor for accurate gas leak detection.
    • Hydrogen gas detector is equipped with 3-wire system 4-20mA analog output, relay output, RS485 output (optional).
    • The H2 gas detector is 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.
    • The hydrogen gas detector has self-calibration function, and three standard keys will be used to realize on-site maintenance.
    • The H2 gas detector can output one or two on-off signals, can drive ventilator, solenoid valve or other external devices.


    Model ATO-GAS-H2-A
    Detection Principle Electrochemistry
    Gas Hydrogen (H2)
    Range (Optional) 0-1000 ppm
    0-2000 ppm
    0-5000 ppm
    0-9999 ppm
    0-1% VOL
    0-4% VOL
    Resolution 0.1 ppm, 1 ppm (range 0-9999 ppm ), 10 ppm/0.001% VOL (range 0-1% VOL & 0-4% VOL)
    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, or RS485 (transfer card included);
    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 male thread explosion-proof flexible pipe
    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)


    • The output signal 4-20mA and RS485 CANNOT be used at the same time.
    • To measure confined spaces such as pipelines, please contact us and inform the detailed conditions of use.

    Fixed Hydrogen (H2) Gas Detector Dimension (Unit: mm)

    Fixed gas detector with alarm dimension

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

    Gas Range (Default) Range (Optional) Resolution
    Combustible Gas (EX) 0-100% LEL 0-100% LEL 1%LEL
    Oxygen (O2) 0-30% Vol 0-25% Vol 0.01%Vol
    Carbon Monoxide (CO) 0-1000 ppm 0-100/500/1000/2000 ppm 0.01ppm/0.1ppm/1ppm
    Hydrogen Sulfide (H2S) 0-100 ppm 0-50/100/500/1000 ppm 0.01ppm/0.1ppm/1ppm
    Methane (CH4) 0-100% LEL 0-100% LEL 1%LEL
    Chlorine (Cl2) 0-10 ppm 0-10/20/50/100 ppm 0.01ppm/0.1ppm
    Hydrogen Chloride (HCL) 0-20 ppm 0-10/20/50/100 ppm 0.01ppm
    Hydrogen (H2) 0-1000 ppm 0-1000/2000/5000/10000 ppm 0.1ppm/1ppm
    Nitric Oxide (NO) 0-100 ppm 0-100/250/500/1000 ppm 0.01ppm/0.1ppm/1ppm
    Nitrogen Dioxide (NO2) 0-20 ppm 0-20/50/100 ppm 0.01ppm/0.1ppm/1ppm
    Formaldehyde (CH2O) 0-10 ppm 0-10/20/-50/100 ppm 0.01ppm/0.1ppm/1ppm
    Ozone (O3) 0-10 ppm 0-1/5/10/20/50/100 ppm 0.001ppm/0.01ppm/0.1ppm
    Carbon Dioxide (CO2) 0-2000 ppm 0-1000/2000/5000/10000/50000 ppm 0.1ppm/1ppm
    Sulfur Dioxide (SO2) 0-20 ppm 0-10/20/100 ppm 0.01ppm/0.1ppm
    Ethylene Oxide (ETO) 0-100 ppm 0-20/50/100/500/1000 ppm 0.01ppm/0.1ppm/1ppm
    Phosphine (PH3) 0-10 ppm 0-10/20/50/100/200/500/1000 ppm 0.01ppm/0.1ppm/1ppm
    Nitrogen (N2) 0-100% Vol 0-100% Vol 0.01%Vol
    Hydrogen Fluoride (HF) 0-10 ppm 0-50 ppm 0.01ppm

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

    Tips: The necessity of a hydrogen gas detector.

    Hydrogen (H2) has the physical properties of colorless and odorless, and the flame is transparent when burned. Therefore, the presence of hydrogen in the environment is not easy to detect by the senses. Generally, Ethyl mercaptan is added to the hydrogen gas so that it can be detected by the senses and make the flame appear color. However, when judging whether hydrogen has leaked, we cannot judge by ignition. Because using an open flame to check hydrogen is tantamount to igniting a time bomb, which is very dangerous. Therefore, it is necessary to use a hydrogen gas detector to monitor the environment where H2 may leak on-line.

    Hydrogen is mainly stored in liquid form. The liquid H2 overflows and evaporates suddenly in a large area, which can also cause hypoxia in the environment, and may form an explosive mixture with the air, causing a combustion and explosion accident.

    ATO hydrogen gas detector is an instrument that can continuously detect the concentration of H2 in the environment. It uses the natural diffusion method to detect the H2 concentration, with an electrochemical sensor. The use of hydrogen detectors can reduce the occurrence of H2 explosion accidents.

    Basic Settings of Portable Gas Detector

    This video will show you the basic settings of ATO portable gas detectors including high/low alarm setting, language setting and time setting.

    Calibration of Portable Gas Detector

    This video will show how to calibrate the ATO portable gas detectors.

    Calibration of Fixed Type Gas Detector

    This video will show the calibration procedures of the ATO fixed type gas detectors.

    Existing reviews of Fixed Hydrogen (H2) Gas Detector, 0 to 1000/2000/5000 ppm
    I am interested in your hydrogen gas detector
    I am Watanabe from Japan and I'm a postgraduate student. I'm writing to you for the first time.
    I'm contacting you to enquire about <Gas-H2>.
    I'm interested in your product and I want to use it to measure H2 in the air. So I have questions about your product.
    1) Is this machine high precision? It's said that there is about 0.5‰H2 in the air so I wonder whether this machine can measure by after the decimal point.
    2)Were there any people who bought it to measure the H2 in the air? If you know about that or thesis, please tell me about that.
    From: Mrux | Date: 29/06/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, our gas detector can measure H2 in the air, and you can choose the measurement range 0-10 ppm (accuracy 0.001 ppm), or 0-500 ppm (accuracy 0.1 ppm).
    Do you have any suggestions for the measurement range of the hydrogen gas detector we are going to buy?
    I am involved with a project where we are researching blending a small percentage of hydrogen into a natural gas distribution system. I found your portable hydrogen sensor while looking for a hydrogen detector that could help us confirm whether or not hydrogen is leaking out of joints where natural gas is not. Could you help me confirm if this would be a suitable use for the detector? If it is, do you have a recommendation for a measuring range?
    From: Jan | Date: 15/11/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, you can use our portable hydrogen (H2) gas detector to measure H2 leakage, and the recommended range will be: 0-1000ppm.
    I've purchased an H2 detector for lab research purposes.
    I'm doing hydrogen production, so once I plug the H2 detector in (with the pump on), it is showing some reading (28ppm). But the reading is dropping slowly after that, (26ppm, then 24ppm, then 20ppm). Which reading should I get for the experiment? Because the reading is fluctuating.
    From: Vivi | Date: 30/05/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The reason for unstable readings may be unstable flow rate or unstable pressure, so please tell us what the flow and pressure of the detection environment are. It would be better if you could provide us with a video of the detector working. Looking forward to your feedback soon.
    Can the ATO-GAS-H2 detect H2 in air?
    Can the ATO-GAS-H2 detect H2 in air? For example, if we pump H2 into a light fixture, would the detector be able to detect if H2 leaks outside of the fixture?
    From: Annette | Date: 27/07/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, it can detect H2 leakage, and the recommended range is 0-500ppm or 0-1000ppm.
    Are there known interactions of the H2 measures provided by the sensor in the presence of NH3?
    Are there known interactions of the H2 measures provided by the sensor in the presence of NH3? For instance, if we have 1 ppm of H2 and 1 ppm of NH3, which value will the sensor read?
    From: DeLisle | Date: 12/12/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Under normal circumstances, H2 and NH3 gases will not interfere with each other. Are there other gas components in your using environment? For example, H2 and CO, H2S and other gases will react and interfere with each other.
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