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

    5 out of 5 based on 6 reviews | Write a review
    Fixed ammonia gas detector is used to detect the concentration of NH3 with selectable measuring range of 0 to 50/100/200 ppm. NH3 detector with sound and light alarm and real-time display, signal output 4-20mA, or RS485, high accuracy, high reliability and low price.
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    Delivery date: 6-12 days

    Fixed type NH3 gas detector is used to monitor the ammonia concentration with optional range of 0 - 50ppm, 0-100ppm, 0-200ppm in different kinds of fields such as refrigerated space, liquid ammonia tank storage area, laboratory, livestock farm, sewage treatment plant, denitrification chemical industry, etc.


    • 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 ATO-GAS-NH3-A
    Detection Principle Electrochemistry
    Gas Ammonia (NH3)
    Range (Optional) 0 to 50 ppm, 0 to 100 ppm, 0 to 200 ppm, 0 to 500 ppm
    Resolution 0.01ppm, 0.1ppm (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 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 1A (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 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

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

    10 Tips for Installing Fixed type Ammonia (NH3) Gas Detector

    1. The fixed ammonia (NH3) gas detector shall not be installed in the place which has high concentration of smoke, jet-propelled insecticide and combustible solvent (coating), otherwise it may cause an alarm.

    2. The fixed ammonia gas detector shall not be installed at the place with large wind flow, such as the vent, ventilator and door. It may affect the accuracy of ammonia detector.

    3. The fixed ammonia detector shall not be installed at the place with much water vapor or water drops (relative humidity is above 90%), otherwise the ammonia sensor may be damaged for being placed in water vapor for a long term.

    4. The fixed NH3 detector shall not be installed at temperatures below -30℃ or below 50℃.

    5. The fixed ammonia detector shall not be installed in a strong electromagnetic field.

    6. As soon as the ammonia detector sends a concentration alarm signal, the output control signal will be locked, even if the gas concentration doesn’t continue to exceed the limit, the controlled device is still unable to restore the pre alarm state automatically, manual reset is required (press the reset button or self-calibration for 3 seconds).

    7. The fixed NH3 gas detector shall be installed in a higher place of the farm because the concentration of ammonia is lighter than the air.

    8. If alarm, the ammonia concentration has exceeded the set alarm concentration. After the cause for excessive NH3 concentration is removed, press the reset button to clear the alarm data.

    9. It’s normal for the alarm sound in the first power-on in case the ammonia detector has been powered off for a long time.

    10. After the ammonia detector is fixed, do not move its position at will, so as not to damage the accessories.

    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 Ammonia (NH3) Gas Detector, 0 to 50/100/200 ppm
    Measuring area for your fixed gas detector
    What is the measuring area for your fixed gas detector?
    From: Frank | Date: 09/04/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hi, Frank. For our fixed gas detector, the detection area is 20 square meter.
    Fixed ammonia gas detector
    How can I connect your fixed ammonia gas detector to my PC via your option "RS 485"?
    From: Brandon | Date: 18/05/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hi, Brandon. For our detector with RS485, we will provide "transfer card and PC software", so you can connect it to your computer, but the price of transfer card is exra.
    Can you provide CL2 Gas Sensor...
    Can you provide CL2 Gas Sensor 0-10 PPM with cable assembly more than 10 m,  200-240 VAC 50 HZ / two Analogue outputs 4-20 mA - LCD disply?
    From: Duane | Date: 26/10/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hello, Duane.
    We can provide Fixed-type CL2 Gas Sensor 0-10ppm (Resolution 0.001ppm) with 200-240 VAC 50 HZ input power, two Analogue outputs 4-20 mA  and LCD display… We shall add a 2-channel control host, and the cable distance between the detection probe and the host is 10m.
    What certification can the ammonia gas detector provide?
    What certification do you provide for your Ammonia gas detector, and do you provide silicon type?
    From: Turles | Date: 29/11/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The certification we can provide for this gas detector is ATEX.
    Also, the price (828.16USD) includes the silicon tube 1m long. For more than 1m, it requires additional payment.
    Calibration time of ammonia gas detector
    Do you provide an ammonia gas detector calibration test kit? And when should I calibrate?
    From: Spud | Date: 20/01/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, we provide. Our ammonia gas detector has a 1 year warranty and will be well calibrated before leaving the factory. Typically, you can calibrate yearly.
    High sensitivity gas detector
    I recently purchased a fixed ammonia gas detector for my industrial plant, it was easy to install and came with clear instructions for set-up and operation. The alarm system is loud and unmistakable. Nice product!
    From: Otto | Date: 27/02/2023
    Was this review helpful? Yes No (0/0)
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