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    Handheld Multi-Gas (4-Gas) Detector, CO, H2S, O2, LEL

    5 out of 5 based on 4 reviews | Write a review
    Handheld multi-gas detector provides 4 gases detection, monitoring CO (0-1000ppm), H2S (0-100ppm), O2 (0-30%VOL), EX (0-100%LEL) with high accurate sensors, and give sound, light and vibration alarms, light weight and mini size, portable and easy to carry, long battery life, reliable quality and low price.
    SKU: GD500-4GAS
    30-day Returns
    Free Shipping
    Delivery date: 6-12 days

    Handheld multi gas detector can measure 4 gases (CO, H2S, O2, LEL) at the same time with high accuracy and reliability, min size and high protability, and it is widely used in oil, metallurgy, chemical, medical, agriculture, refinery and other industries.


    • Adopt high precison sensors
    • LCD dot matrix display, , support Chinese and English operation, easy to read
    • Gas unit ppm and mg/m3 can be switched quickly
    • One key to check the battery capacity and voltage.
    • One press to restore factory settings.
    • Alarm with ultra-high buzzer sound and light, high and low alarm values are settable
    • Rechargeable lithium polymer battery with high capacity enables long working time
    • With a alligator clip, easy to carry around
    • Rugged and durable housing, comfortable touch
    • Data storage function: Can record 100,000 data, and historical data can be viewed on the device (optional function).


    Model GD500-4GAS
    Sampling Method Diffusion
    Gas Carbon Monoxide (CO), Hydrogen Sulfide (H2S), Oxygen (O2), Combustible (LEL)
    Range CO: 0 to 1000ppm, H2S: 0 to 100ppm, O2: 0 to 30%VOL, EX: 0 to 100%LEL
    Resolution CO: 1ppm, H2S: 0.1ppm, O2: 0.1%VOL, EX: 1%LEL
    Accuracy ≤±3%F.S.
    Display Monochrome dot matrix 128*128 LCD graphic display
    Backlight Backlight time is settable; the backlight will be auto on when alarming.
    Data Logging (Optional Function) Storage capacity of over one hundred thousand sets. Interval time ranginf from 10~3600 seconds are settable.
    Alarms Sound, light and vibration
    Operation Language Chinese/English
    Gas Unit Gas units ppm and mg/m3 are switchable
    Battery 3.7V rechargeable lithium battery with 2300mAh capacity
    Operating time about 10-12h
    Charger Travel charger with USB. Typical charge time 4-6 hours.
    Explosion-proof Grade Exia ll CT3
    Case Material ABS+PC
    Protection Grade IP65
    Operating Temperature -20℃~50℃
    Operating Humidity 0~90%RH (non-condensing)
    Dimension 131*85*35mm
    Weight 240g


    Handheld Multi Gas Detector Details

    Tips: What does it mean, the gas units PPM, %LEL, %VOL in multi-gas detector's specification?

    1. PPM
    PPM refers to parts per million, a unit of gas volume concentration.
    For solution: it means that there’s 1/1000 ml solute in the 1L aqueous solution, so its concentration is 1ppm.
    For gas: it’s one of representation method of pollutant concentration in the ambient atmosphere (air).
    2. %LEL
    LEL refers to the lower explosive limit. When the combustible gas reaches 100%LEL, it’s easy to explode, and the explosion occurs as soon as contacting an electric spark. Therefore, 0-100%LEL generally refers to the range of combustible gas measurement. For example, hydrogen: 4%VOL=100%LEL, methane: 5%VOL=100%LEL.
    3. %VOL
    VOL refers to the volume ratio of target gas in per volume. It’s generally used for high concentration. 1%VOL is equal to 10000PPM, and generally it is for oxygen and combustible gases. For example, how much oxygen in a space.

    Existing reviews of Handheld Multi-Gas (4-Gas) Detector, CO, H2S, O2, LEL
    I do have some additional questions though
    I do have some additional questions though. What is the accuracy of all channels? Can the device be delivered with an outlet port such that vent gas can be sent to a safe location? For example, can a ¼” BSP female connection be provided at the outlet port? Regarding the frequency, and correct me if I’m wrong, electrochemical analysis is batch wise, meaning that you can have a maximum amount of analysis cycles per time unit. What would that be for this device?
    From: joseph | Date: 23/11/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. All channels have an accuracy of 2-3%FS.
    2. The instrument has an air outlet and can be connected to a safe location.
    3. Sorry, we have Not calculated this analysis cycles.
    We need to ask some questions about the gas detector.
    Can you add wireless function to your handheld gas detector, so can you get the data directly to my PC?
    From: Ran | Date: 26/01/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, we can add a wireless module to the handheld gas detector, so you can monitor and record data on your PC.
    Calibration Password
    Hi, I needed a password to calibrate the gas meter.
    thank you
    From: Masoud | Date: 04/07/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    For this question, please contact the after sales technical department.
    Useful multi gas detector.
    Useful multi gas detector. It helps me a lot in my work.
    From: Zachary | Date: 28/08/2018
    Was this review helpful? Yes No (0/0)
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