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    Fixed Ammonia (NH3) Gas Detector, 0 to 50/100/200 ppm

    Fixed ammonia gas detector with sound and light alarm and real-time display, can detect the concentration of NH3 with measuring range of 0 to 50/100/200 ppm. NH3 detector is available with signal output 4-20mA & RS485, high accuracy and high reliability.
    SKU: GD300-NH3
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    🚚 Free shipping
    🔙 30-day returns
    📅 Delivery: 7-12 days

    Fixed ammonia gas detector is a kind of 24h continuously wall mounted type gas detector, with alarm light, data display and high/low alarm, fast response, high precision and good stability. Powered by 4-20mA and RS485 signal output, suitable for different kinds of situations.

    sisco fixed gas detector

    Anti-magnetic interference

    • The fixed ammonia gas detector can resist the strong magnetic interference of 15V/meter.
    • In areas with dense magnetic products or dense electronic products, such as tunnels, mines, confined spaces, etc., the data is guaranteed to be stable and reliable.
    sisco fixed gas detector

    Using high-precision sensors

    • The fixed online NH3 gas detector is equipped with an infrared remote control as standard, which can realize the functions of alarm point setting, zero point calibration, and address modification without opening the cover.
    • Compatible with various control alarms, PLC, DCS and other control systems to realize remote monitoring.
    sisco fixed gas detector

    Variety of installation methods

    • Wall mounted type, installed on the wall directly, real time monitoring.
    • Piping type, installed on the pipeline, monitoring the gas concentration inside.
    • Flow type, connected with external sampling pump and tube, measure the gas concentration in enclosed space.


    Fixed ammonia NH3 online gas detector can detect harmful gas of furniture, flooring, wallpaper, paint and other items, which is widely used in biological pharmaceutical factories, green home, livestock and poultry breeding, greenhouse cultivation, warehousing and logistics, brewing and fermentation, agricultural production, etc.

    Fixed online gas detector application

    Model GD300-NH3
    Detection Principle Electrochemistry
    Gas Ammonia (NH3)
    Range (Optional) 0 to 50 ppm, 0 to 100 ppm, 0 to 200 ppm, 0 to 500 ppm, 0-1000 ppm
    Resolution 0.01 ppm (0-50 ppm), 0.1 ppm (0-100 ppm, 0-200 ppm), 1 ppm (0-500 ppm, 0-1000 ppm)
    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 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 Power connection type: G1/2 male thread explosion-proof flexible pipe
    Pipe-mounted type: 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 1A (Optional USA plug & Europe plug)

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

    Fixed Ammonia (NH3) Gas Detector Dimension (Unit: mm)

    Fixed gas detector with alarm dimension


    Q1: What is a fixed gas detector?
    The fixed gas detector is composed of sensors and transmitters, and is installed at the detection site. The secondary instrument consisting of circuit, power supply and display and alarm device is installed in a safe place, which is convenient for staff to monitor. In industrial installations and production processes, fixed gas detectors are generally used, because fixed gas detectors can be installed at specific detection points to detect specific gas leaks.

    Q2: What does a gas detector detect?
    A2: Combustible gases: Natural gas (methane), liquefied gas, coal gas (hydrogen), acetylene, pentane, alkynes, acetone, toluene, alcohols, hydrocarbons, light oil, etc.
    Toxic gases: Carbon monoxide, hydrogen sulfide, ammonia, chlorine, oxygen, phosphine, sulfur dioxide, hydrogen chloride, chlorine dioxide and other toxic and harmful gases.

    Q3: Difference between fixed gas detector and portable gas detector
    A3: The biggest advantage of fixed gas detectors is 24-hour uninterrupted measurement. As long as the power is turned on, the fixed gas detector is in normal detection work. Portable gas detectors are usually used in confined spaces and confined spaces, but the gas environment in these spaces is usually very complex, and there will be situations such as lack of oxygen and high concentrations of harmful gases.

    Tips: What are the installation requirements for fixed gas detectors?

    The fixed gas detector is generally fixed on the wall, but different heights will affect the accuracy of the gas detector, which is a major focus of installing it.

    • The density of the gas to be measured
      When installing a fixed gas detector, you should first consider the density of the gas to be measured. We all know that the density of various gases is different from the density of air. If the density of the gas to be tested is greater than that of air, it should be installed below the gas released; if it is less than air, it should be installed above the leakage of the gas to be tested, so that the gas can be detected faster and more accurately.
    • Annual inspection
      To ensure its detection accuracy, gas detectors should be calibrated at least once a year.
    • Distance between controller and fixed gas detector
      The controller and the fixed gas detector cannot be placed together. The gas detector is installed in a dangerous area where gas is easy to leak and accumulate, while the controller is installed in a safe area that is easy to see.

    Thank you for buying industrial test and measurement equipment on, all products sold by SISCO and the partner cover a 12 months warranty, effective from the date of receiving the products.

    What is covered?

    SISCO is responsible for providing free spare parts, and free technical support to assist the customer to repair the defective products until the problem is solved.

    What is not covered?

    • Product purchased from anyone other than a SISCO store or a SISCO authorized reseller.
    • Expendable parts.
    • Routine cleaning or normal cosmetic and mechanical wear.
    • Damage from misuse, abuse or neglect.
    • Damage from use of parts other than SISCO approved.
    • Damage from use outside the product’s usage or storage parameters.
    • Damage from use of parts not sold by SISCO.
    • Damage from modification or incorporation into other products.
    • Damage from repair or replacement of warranted parts by a service provider other than a SISCO authorized service provider.
    • Damage caused by the application environment not meeting the product usage requirements and the failure to perform preventive maintenance.
    4.5 2
    Write your own review Close
    macy | 9/17/2023 6:27 PM
    Provides peace of mind and protection
    This fixed ammonia (NH3) gas detector is fantastic! I am amazed by its reliability and accuracy. Whether it's 0 ppm to 50 ppm, or 100 ppm and 200 ppm, it's easy to detect and ensure our work environment is safe.
    wenly | 9/4/2023 8:16 PM
    Works very well
    The fixed Ammonia gas detector I purchased feels great to use! It continuously monitors the concentration of Ammonia in the air, ensuring workplace safety. Easy to install, intuitive to operate, and a responsive alarm system. This instrument keeps us safe from potential Ammonia hazards and is vital to our team and production environment.