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    Fixed Hydrogen Sulfide (H2S) Gas Detector, 0 to 50/100/500 ppm

    5 out of 5 based on 2 reviews | Write a review
    Fixed H2S gas detector is 24 hours online to detect the hydrogen sulfide and gives sound and light alarm with measuring range from 0 to 50 ppm, 0 to 100 ppm, or 0 to 500 ppm. High accuracy and reliability hydrogen sulfide detector has real-time display and infrared remote control with optional output signal 4-20mA, 1-5V, RS485, RS232, or relay.
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    Delivery date: 6-20 days

    Hydrogen Sulfide (H2S) gas detector, fixed, is used to monitor the H2S concentration in different kinds of environment or pipeline and alarm with sound and light, to safeguard the organic life.


    • Adopting high precision sensor for accurate gas leak detection.
    • Equipped with optional 3-wire system analog output, one group relay output, or RS485 output.
    • 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.

    Fixed H2S Detector Specification

    Model ATO-YT95H-H2S-A
    Detection Principle Electrochemistry
    Gas Hydrogen Sulfide (H2S)
    Range (Optional) 0 to 50 ppm, 0 to 100 ppm, 0 to 200 ppm or 0 to 500 ppm
    Resolution 0.01ppm, 0.1ppm or 1ppm (related to the selected range)
    Accuracy ≤±3% F.S.
    Responce Time ≤10s
    Repeatability ≤±1%
    Recovery Time ≤10s
    Linearity Error ≤±1%
    Zero Shift ≤±1% (F.S./year)
    Signal Output (Optional) 4-20mA, 1-5V, RS485, RS232, or relay
    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, or 110-220V AC
    Case Material Die-casting aluminum housing
    Operating Temperature -20℃~50℃
    Operating Humidity 0~95%RH (non-condensing)
    Dimension 206*179*90mm
    Weight ≤1.6kg

    Fixed Gas Detector Dimension (Unit: mm)

    Fixed gas detector with alarm dimension

    *** Other Common Gases and Measure Ranges Available for Fixed Gas Detector

    Gas Range (Default) Range (Optional) Resolution
    Combustible/Flammable 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
    Methane (CH4) 0-100% LEL 0-100% LEL 1%LEL
    Ammonia (NH3) 0-100 ppm 0-100/200/500/1000 ppm 0.01ppm/0.1ppm/1ppm
    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 measure ranges are listed in the above table. For more information & specific price, please feel free to contact us.

    Tips: Gas characteristics and detection of hydrogen sulfide (H2S)

    Hydrogen sulfide (H2S) is a flammable colorless gas with a typical smell of rotten eggs. It is easily soluble in water; at the temperature of 20℃, 2.9 volume of is soluble in 1 volume of water. Hydrogen sulfide is also soluble in alcohols, aldehydes, carbon disulfide, petroleum solvents and crude oil.

    Hydrogen sulfide is five to six times more toxic than carbon monoxide and is almost as toxic as cyanide. At the low concentrations (0.13 - 4.6 ppm), hydrogen sulfide smells rotten eggs. When the H2S concentration is higher than 4.6 ppm, the human sense of smell is quickly passivited and the odour of rotten eggs is not smelled. This situation is the most dangerous.

    When the H2S concentration is between 4.3 and 46%, the mixed gas formed with the air will explode in a fire. The burned product, SO2, is still toxic and will continue to harm the eyes and lungs of the human body. The work of preventing poisoning during burning cannot be relaxed.

    Hydrogen sulfide (H2S) exists in a wide range of places like natural gas processing plants, refineries, rubber products plants, pulp mills, tunnels, sewers, sewage ponds, biogas digesters, etc. Therefore, it is really necessary to detect H2S gas concentration before the operations in the above-mentioned places.

    ATO offers a high precision hydrogen sulfide gas detector including fixed and portable. Whether selecting portable or fixed H2S detector should be based on the operating environment. The measure range should also be chosen according to the site conditions, so as to meet the different use requirements. Thus, even in the unfavorable working conditions, the detector can also detect harmful gases and promptly give an alarm to the staff.

    Gas Detector Catalogue

    Fixed Gas Detector User Manual

    Existing reviews of Fixed Hydrogen Sulfide (H2S) Gas Detector, 0 to 50/100/500 ppm
    Fixed Hydrogen Sulfide (H2S) Gas Detector
    Can your fixed hydrogen sulfide (H2S) gas detector work in biogas line, if yes, then what is the estimated lifetime of the electrochemical sensor?
    From: Blake | Date: 03/07/2019
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, and the lifetime of electrochemical sensor is 2-3 years.
    Input Voltage of Hydrogen Sulfide (H2S) Gas Detector
    Can you provide fixed H2S gas detector but with 120V input voltage?
    From: Kiel | Date: 22/07/2019
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hi, Kiel. The input voltage of this fixed H2S detector should be 24V DC, but you can use one of our switching mode power supply to convert 120V AC To 24V DC.
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