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    Portable Multi Gas Detector, 4-Gas, LEL, O2, CO, H2S

    5 out of 5 based on 4 reviews | Write a review
    With built-in gas sampling pump, multi-gas detector can measure 4 gases EX (0-100%LEL), O2 (0-30%), CO (0-1000 PPM), H2S (0-100PPM) fast and accurately. Featuring fast response, large pumping flow rate, small size, portable design, and durable housing, the gas monitor is suitable for various environments.
    SKU: GD200-M4
    30-day Returns
    Free Shipping
    Delivery date: 6-12 days

    High cost-effective multi gas detector is used for monitoring 4 gas concentration of EX (0-100%LEL), O2 (0-30%), CO (0-1000PPM), and H2S (0-100PPM), widely applicable for tunnels, tube well, laboratory, and other confined spaces.


    • LCD dot matrix display, direct readout of gas type, unit, concentration, local time, etc.
    • Support English/Chinese operation, easy to shift.
    • Gas concentration unit PPM and mg/m3 can be shift quickly.
    • Built-in micro-sampling pump, 10 grades of suction are available.
    • Explosion-proof certification

    Gas Detector Functions

    • With self-calibration and zero calibration functions, makes the detection more accurate and reliable.
    • One key to restore factory setting, free from maloperation.
    • With temperature and pressure compensation, able to realize the compensation for the gas concentration under different temperature and pressure environments.
    • Two-stage alarm with sound and light, and alarm point is settable.
    • Rechargeable lithiumpolymer battery with large capacity.
    • High-strength special engineering plastic housing, with anti-slip, waterproof, dustproof and explosion-proof.


    Model GD200-M4
    Sampling Method Pumping suction, flow rate can be up to 750ml/min
    Detection Principle Electrochemistry (O2, CO, H2S), Catalytic combustion (EX)
    Gas EX, O2, CO, H2S
    Range (Optional) CO: 0-500ppm/0-1000ppm/0-2000ppm, H2S: 0-100ppm/0-200ppm, O2: 0-25%VOL/0-30%VOL, EX/CH4/LEL: 0-100%LEL
    Resolution CO: 1ppm, H2S: 0.1ppm, O2: 0.1%VOL, EX/CH4/LEL: 1%LEL
    Accuracy ≤±3% F.S.
    Responce Time ≤10s
    Repeatability ≤±1%
    Recovery Time ≤10s
    Linearity Error ≤±1%
    Zero Shift ≤±1% (F.S./year)
    Data Logging (Optional Function) High speed data transmission by USB, available for data downloading and printing (The built-in IC card has about 2G memory, which can record 100,000 sets of data.)
    Alarms Sound, light and vibration
    Display LCD dot matrix display
    Language Chinese/English
    Battery 3.7V rechargeable lithium battery, 3.7 Watt
    (Charger included: Input AC 100-240V 50/60Hz with optional USA, Europe or UK plug)
    Operating Time 100h (Pump off)
    Communication Mini USB interface supports standard MODBUS communication protocol
    Explosion-proof Grade Ex ia IIC T4
    Case Material ABS+PC
    Protection Grade IP66
    Certification CE, ATEX
    Operating Temperature -20℃~50℃
    Operating Humidity 0~95%RH (non-condensing)
    Operating Pressure 0.8~1.2bar
    Dimension 205*75*32mm
    Weight 300g
    Warranty 12 months
    Extension Probe About 480mm (Total Length), About 300mm (Probe Head)

    * We also provide other common gas detectors, and you can refer to ATO Gas Detector Catalog to get the specific gas type and measurement range. If you have any questions, please feel free to contact us.


    Portable Multi Gas Detector Details

    Tips: Service Life of Gas Detector

    A gas detector is mainly composed of a sensors, circuit board and other components. It can be divided into two main parts, that is, the first part is the sensor part, and the second part is the body part of the detector, so for the service life of equipment, we also need to tell based on the two parts of the gas detector.

    Let's look at the sensor in the gas detector first. The sensor has a fixed service life. The service life of the sensor varies with different principles. For example, the electrochemical sensors are usually designed for two-year service life and it has to be replaced when it expires. The replacement time is generally not related with use times and storage time, because the electrochemical sensor has the electrolyte at its internal which will naturally reduce in the process of the placement of the sensor even if you don't use it. Basically, it has a fixed replacement cycle, so it must be replaced once it comes due. It is suggested that it is unnecessary to prepare a sensor in advance in the use of gas detector, otherwise it is a kind of waste and loss.

    The second part is the circuit board of the gas detector. From this point of view, generally a reliable designed circuit board with sufficient materials can guarantee the service life of the detector body for 3-5 years. Of course, we also refer to normal use, without rough operation, discarding and other bad and irregular preservation and operation. Some portable gas detectors include suction pumps and batteries that last about two years.

    As for the service life of the gas detector, generally speaking, there will be no problem with the circuit board under normal use. In most cases, it is the sensor failure that causes the instrument failure. Therefore, the service life of the gas detector is equal to the service life of the sensor. The service life of the electrochemical sensor is about 2 years. After 2 years, the performance of the instrument needs to be tested and the sensor needs to be replaced.

    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.

    Concentration Detection of Pesticides Gas
    Methyl bromide is an organic compound with the chemical formula CH3Br, which is mainly used as a pesticide, fumigant, refrigerant and solvent, and can also be used in organic synthesis.This video will mainly use methyl bromide and CH3Br as examples to introduce the detection of their concentrations.

    How to Detect Hydrogen Sulfide Concentration in the Toilet
    Hydrogen sulfide is a flammable acidic gas that smells like rotten eggs at low concentrations and is very toxic. In actual operation, it is necessary to ensure that the detection equipment or method used can accurately measure the concentration of hydrogen sulfide, and pay attention to safety issues during operation to avoid hydrogen sulfide poisoning.

    How much C2H4 (ethylene) do ripe bananas and apples produce?
    We have various gas detectors such as: CO, O2, O3, H2, NH3, H2S, CH4, Cl2, CH2O, etc, from 0~10000ppm, Industrial or daily use.

    Existing reviews of Portable Multi Gas Detector, 4-Gas, LEL, O2, CO, H2S
    If the customer purchase computer connectivity/software option,  What is the least time he can record measurements, every one second or every one minute, or what?
    From: Isaac | Date: 23/11/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. The minimum time that a measurement can be recorded is one second.
    2. Our multi gas detector has been quoted before, but we can Not provide this ¼” BSP female connection.
    I would like to place an order for a suitable gas detector
    I would like to place an order for this product (RKI GX-3R Personal 4 Gas Monitor) from your reputable organization.
    I will be grateful if you can get back to me with the availability and your quote.
    From: carson | Date: 17/07/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    We recommend a similar Portable Multi Gas Detector, 4-Gas, LEL, O2, CO, and H2S.
    This product can meet your needs.
    Works perfectly, provide security for my family
    In order to buy a good carbon monoxide gas detector, I bought several manufacturers. I am very satisfied with the purchase this time. The ATO technicians have helped me a lot, and I am very grateful to them. This four-in-one gas detector monitors data quickly.
    From: Vincent | Date: 12/04/2022
    Was this review helpful? Yes No (0/0)
    High-quality gas detector
    I want 7 of these units to be able to monitor from 0 to 100ppm of formaldehyde. We will use these inside a hatcher to monitor the levels as the chickens hatch out. I need to monitor for 3 days and I need the data to be able to be graphed out. Can you help me? Do you have a picture of the graph or does it just get exported to excel and then I have to do it myself?
    We typically use drager, but the new models (PAC 8000) don’t work like the old discontinued PAC III. Here is an example of how it charts over the 72 hour period.
    From: Sevath | Date: 14/09/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The most common working time of our portable formaldehyde (CH2O) gas detector is 24 hours (after full charge). Therefore, if you want to exceed 72 hours, we recommend customers to use fixed(CH2O) gas detectors. It can run continuously for a long time. However, we can only export the measurement data to the excel file without providing the historical graph. Is that acceptable to the customer?
    Our suggestion is: 7 (CH2O) gas detector + 1 bus system gas alarm controller + RS485 module + PC software.
    Can be installed on the PC to view the measurement data in real time. And you can export the historical data to Excel files for analysis, there is no historical graph to refer to.
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