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    Fixed Nitric Oxide (NO) Gas Detector, 0 to 250/500/1000 ppm

    The exclusive discounted nitric oxide gas detector provides highly accurate measurements for sale. The built-in alarm system ensures you know the NO concentration in the environment promptly. The measurement range is 0~250ppm, 0~500ppm, and 0~1000ppm to choose from, which is highly reliable. Characteristic, high stability hydrogen sulfide detector, real-time display, output signal 4-20mA or RS485 optional.
    SKU: GD300-NO
    30-day Returns
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    Delivery date: 6-12 days

    The fixed nitric oxide gas leak detector is used to monitor NO concentration in different environments or pipelines. The measurement range is 0 to 250/500/1000 ppm. The gas monitor detects hydrogen sulfide online 24 hours a day and issues an audible and visual alarm. The infrared remote control is explosion-proof, the working voltage is 12-30V DC, and the output signal is three-wire 4-20mA standard signal output or RS485 signal output.


    • Adopting high precision sensor for accurate gas leak detection.
    • Equipped with 3-wire system 4-20mA analog output, relay output, RS485 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-NO
    Detection Principle Electrochemistry
    Gas Nitric Oxide (NO)
    Range (Optional) 0 to 250 ppm, 0 to 500 ppm, 0 to 1000 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) 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 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)


    • 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 Gas Detector Dimension (Unit: mm)

    Fixed gas detector with alarm dimension

    Other Common Gases and 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

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


    Fixed Hydrogen Sulfide (H2S) Gas Detector Details

    Tips: Installation of Fixed Hydrogen Sulfide (H2S) Detector

    A fixed nitric oxide (NO) gas detector is a device specially designed to monitor the concentration of nitric oxide gas in the environment. The gas leak detectors are widely used in industrial, chemical, gas, environmental protection, and medical fields to ensure that the concentration of nitric oxide is within a safe range and to sound an alarm once the concentration rises.

    Working Principle and Composition

    1. Sensor: Fixed NO gas detectors are usually equipped with nitric oxide gas sensors. Common gas sensor types include electrochemical sensors, optical sensors, and chemical sensors. These gas sensors work on different principles, but all detect the presence of nitric oxide molecules.
    2. Data Acquisition: The gas leak detector sensor generates an electrical signal or other sensing signal by detecting the concentration of nitric oxide gas in the surrounding environment.
    3. Data Processing: The generated signals are fed into a built-in microprocessor or control unit for data processing and analysis.
    4. Alarm Systems: Gas monitors are often equipped with gas alarm systems with sound, light, or digital interfaces, and often the ability to transmit information to a monitoring center. When the nitric oxide concentration exceeds the set safety threshold, the gas alarm system is triggered to notify the operator to take necessary measures.
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