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    Explosion-Proof Multi Gas Detector, 5-Gas, CO, H2S, O2, LEL, VOC

    5 out of 5 based on 5 reviews | Write a review
    Favorable price portable gas detector can detect 5 gases at the same time, including CO, H2S, O2, LEL, VOC. IECEX, ATEX, explosion-proof certificates, selectable VOC measuring range of 0 to 100 ppm, 0 to 500 ppm, 0 to 1000 ppm, 0 to 5000 ppm, fast response and accurate detection.
    SKU: GD400-5GAS
    30-day Returns
    Free Shipping
    Delivery date: 6-12 days

    High performance handheld gas detector is a suction and diffusion dual-purpose device. When the air pump fails or in special emergency situation, it can automatically switch to the diffusion sampling method, thereby improving the protection to a new level.


    • The portable gas detector can effectively resist a three-meter drop, has passed the EMC anti-static interference test and can work normally in the walkie-talkie environment.
    • It has got IECEX, ATEX, explosion-proof certificates and the explosion-proof level reaches Exia IICT4 Ga. The man down alarm function has upgraded the safety of underground operators.
    • Password protection function prevents non-operators from modifying menu parameters. With safety reminder function, sound and light vibration alarm function, let operators work without worries. The high and low alarm latched function allows the operator to better capture the sudden change of the gas concentration value.
    • Real-time value, TWA, STEL, MAX, MIN multiple numerical display, and the screen can be automatically turned 180 degrees, which is convenient for viewing in special operating environments.
    • Built-in powerful sampling pump, fast detection speed. It can be connected 20m sampling tube externally, which is convenient for long-distance or confined space detection.
    • Pump suction and diffusion dual use, to provide operators with more reliable protection. With a water trap filter, it can effectively filter water, oil, dust and other impurities. It can also be used in harsh industrial environments such as coal mines and petroleum fields.
    • Beautiful and friendly user interface, reasonable and easy-to-use interactive mode. Standard storage function, one-click data export, convenient for users to analyze.
    • Unique modifiable ID identification function, convenient for users to allocate and manage the instrument. A full range of automatic detection functions, automatic prompts for voltage, pump failure alarms, etc., more comfortable to use.
    • One-key open storage, automatic image flip. It supports each channel sensor to restore the factory setting separately and multi-language including English, Chinese and etc.


    Model GD400-5GAS
    Sampling method Pump suction & diffusion dual-use type
    Gas type CO, H2S, O2, LEL, VOC
    Principle Catalytic combustion, Electrochemistry
    Measuring range O2: 0-30%VOL, EX: 0-100%LEL, CO: 0-1000PPM, H2S: 0-100PPM, VOC: 0-100PPM, 0-200PPM, 0-500PPM, 0-1000PPM, 0-2000PPM, 0-5000PPM (Optional)
    Resolution O2: 0.01%VOL, EX: 1%LEL, CO: 1PPM, H2S: 0.01PPM
    Response time ≤30 seconds
    Precision ≤±2%F.S except for special gases
    Language Chinese/English (More language can be customized)
    Automatically test and calibrate after power-on Including reset, maximum value (MAX), minimum value (MIN), STEL, TWA value
    Unit PPM and mg/m3 can be switched and displayed by one key, and the concentration value is automatically converted by the system
    Display Monochrome graphics (160 x96), screen can be automatically flipped
    Backlight The backlight time can be manually set, and will be turned on automatically
    when an alarm is issued
    Data record Can store 100,000 sets data, the storage interval is adjustable from 5 to 3600 seconds, data can be exported, with data cable
    Alarm 95dB buzzer (@30cm), vibration alarm and flashing red LED and alarm
    status indication on the screen, alarm latched; diagnostic alarm and battery undervoltage alarm, pump block alarm; man down alarm, with early warning and optional real-time remote Bluetooth notification function
    Battery 3.7V rechargeable lithium battery, battery capacity 2200mA
    Working hours More than 15 hours in continuous pumping mode
    Charger Travel charger with DC interface, charging time ≥ 4 hours
    Explosion-proof grade ll 2G Ex ia ll CT4 Ga
    (EU regulations)
    Protection grade IP67
    Working temperature -20℃~+50℃
    Humidity 0~90%RH (no condensation)
    Environmental pressure 86~106Kpa
    Size 157*84.5*59.5mm (including back clip/water trap filter) (length * width * height)
    Weight 365g (including battery, belt clip and filter)
    Package Included 1 piece Gas detector, 1 piece 12V/1A DC power adapter, 1 piece USB cable, 1 piece User manual, 1 piece Warranty card, 1 piece Filter, 1 piece Aluminum suitcase


    Explosion Proof Multi Gas Detector Details


    Applications of Portable Multi Gas Detector

    Tips: How to maintain portable gas detector?

    • Check the gas flow rate, usually 30/h. Excessive or too small flow will have a greater impact on the analyzer results.
    • Replace the filter paper: stop the air pump and drain the filter tank.
    • Check whether there is any air leakage in the gas system. Whether the diaphragm of the sobbing pump is damaged, whether the sealing ring of the sampling probe is broken, whether the four-way valve and condensate are damaged, etc.
    • Cleaning the sampling probe and dredging the sampling hole pipeline
    • Check whether the condenser is working normally, usually the temperature is adjusted within 3℃.
    • Check the measuring device room to see if it is dirty, and clean it in time.
    Existing reviews of Explosion-Proof Multi Gas Detector, 5-Gas, CO, H2S, O2, LEL, VOC
    Detect hydrogen.
    Can I test hydrogen continuously for 96 hours at a pump rate of 1?
    From: Gray | Date: 09/09/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The sensor is based on electro-chemical principles. The background gas must contain oxygen to detect, and the concentration of oxygen and hydrogen must be 1:1. You can detect hydrogen below 10000ppm as long as the oxygen concentration is not lower than 1% VOL.
    How to detect H2?
    I want to know how to use this instrument to detect H2 accurately and can it detect H2 in N2 background gas without O2?
    From: Gray | Date: 09/09/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The background gas requirement for this meter to accurately detect H2 is air. It can detect H2 in an N2 background gas without O2, but the continuous time for detection should Not exceed 10 minutes. Besides, our H2 sensor only can stand pressure 1bar ±10%.
    The measured data is accurate
    I bought this gas detector for use near my food processing plant and the measurements are accurate every time. I will buy this gas detector again.
    From: Adcock | Date: 26/07/2022
    Was this review helpful? Yes No (0/0)
    When should I calibrate your gas detector?
    When should I calibrate your gas detector?
    From: Curtise | Date: 25/01/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Gas detector typically calibrated once a year, if used frequently, then it should be half a year.
    Thanks for your advice
    Thank you for providing the following information and suggestions. We will order the second explosion-proof multi-gas detector.
    From: Skluk | Date: 24/10/2021
    Was this review helpful? Yes No (0/0)
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