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

    5 out of 5 based on 12 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 and RS485, high accuracy 3% F.S. H2 gas leak detector for hydrogen concentration detecting with sound & light alarm, fixed design, compact structure.
    SKU: GD300-H2
    30-day Returns
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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 and 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 GD300-H2
    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 1 ppm (range 0-9999 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 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 Hydrogen (H2) 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 Hydrogen (H2) Gas Detector Details

    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.

    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 Hydrogen (H2) Gas Detector, 0 to 1000/2000/5000 ppm
    I have a few questions of detector
    I am a researcher at De Nora Tech in Ohio. I have a water electrolysis test setup that generates high-purity H2 and high purity ­O2, and I am interested in sensors that are able to measure the concentration of H2 and O2 in these streams.

    I see that ATO has both hydrogen and oxygen-fixed gas detectors (SKU# ATO-GAS-H2-A and ATO-GAS-O2-A respectively) and the specs seem to be close to what we need for resolution and LDL.
    I have a few questions that I hope you can help me out with.

    First, we need to set up our system with a flow-through sensor. I believe these are intended for use in measuring the ambient concentrations of gases, but is it possible to pass our product stream over the sensing unit with a tee fitting or something along those lines? If you’ve ever seen these sensors used in this way, do you know if there’s a specific flow rate we need to maintain?

    Additionally, what pressure ranges are these sensors able to operate at?
    From: zhen | Date: 25/07/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. Our gas detectors can only measure air gas, not water and liquid. What environment do you need to test?
    2. Our gas detectors must have a constant flow of 1L/min.
    3. Our gas detectors must have a constant pressure of 1Bar±10%.
    4. Our gas detectors can measure both the gas concentration in the conventional environment and the gas concentration in the pipeline.
    Some question of gas detector
    Thank you for the response. It really helps us with ensuring the safety of our project here. I saw on the website under specs for the detector, it says that it has certifications from CE and ATEX and also rated for Ex d II. I’ll attach the screen shot here.
    Would that information on the website be false then?
    From: melody | Date: 06/06/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, the website shows an error.
    The gas detector you purchased complies with the Ex d llC T6 standard, but there is no ATEX certificate.
    Our upgraded version only has ATEX (currently applying for this certification).
    What is the maximum gas pressure the unit can safely detect?
    Additionally, what is the maximum gas pressure the unit can safely detect?
    From: cynthia | Date: 10/05/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The pressure the sensor can withstand is 1bar ± 10%.
    What is the limiting factor of gas detector?
    To confirm, is that 1 bar gauge or absolute?
    And what is the limiting factor?
    From: nikos | Date: 10/05/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1 bar is absolute pressure. It can only be in the range of 1bar ± 10%.
    Had a question regarding gas detector
    We have recently purchased the H₂ detector (ATO-GAS-H2-A) and had a question regarding its ATEX rating.
    I see that the detector is rated for ATEX zone 2 on the website, but the cable gland seemed too big compared to the cable that gas can go in and out of the detector freely, making contacts with the circuit boards.
    Are we supposed to use a special cable or some gasket to seal the cable gland if we were to use the detector in a hazardous environment?
    From: nealon | Date: 09/05/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    What is your order number?
    You do not need to use a special cable or some gasket to seal the cable gland.
    In fact, the cable is only connected to the internal power circuit board of the sensor, and the power circuit board and the sensor circuit board (gas detection area) are separated, which does not affect the use. Of course, it would be better if you want to seal the cable joints.
    Is there a reason for no classification label on H₂ detector?
    For the H₂ detector itself, I don’t see any label regarding its class / zone ratings.
    As far as I’m aware, classified equipment must have its class / zone markings on its body.
    Would there be a reason for not having a classification label on the sensor?
    From: niki | Date: 09/05/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. The ATO-GAS-H2-A you purchased has Chinese explosion-proof certification, so the label of class / zone ratings will not affect your use. We are in the process of applying for ATEX explosion-proof certification for the subsequent updated version of the gas detector. Once the certification is passed, the subsequent upgraded version will be equipped with a label of this level/area rating as standard.
    2. Yes, we saw that the mounting hole in the photo you sent is too big for the cable itself, but we confirmed that this does not affect the use of the gas detector in a zone 2 environment, as we mentioned below, inside the circuit board and sensing area are isolated.
    If you are still worried, we recommend that you fill the remaining gap of the hole with insulating tape or gas filler, which can isolate the external airflow from entering the detector.
    Has new gas detector to be bought every two years?
    I read in the YT-95H-:XX manual that the lifespan is two years.
    Does this mean that a new detector has to be bought every two years?
    Thank you, best regards.
    From: marge | Date: 06/04/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The life of the sensor is 2 years, and after 2 years, the life of the sensor expires.
    You can replace the sensor with a new one without replacing the entire detector.
    You can replace it yourself, and then calibrate it yourself.
    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.
    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.
    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.
    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 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).
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