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    Fixed Oxygen (O2) Gas Detector, 0 to 30% Vol

    Fixed O2 gas detector for detecting oxygen concentration with measuring range 0-25% or 0-30% Vol. Oxygen gas detector with output signal 4-20mA and RS485, has sound and light alarm, real-time display, remote control, high accuracy 3% F.S.
    SKU: GD300-O2
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    🚚 Free shipping
    🔙 30-day returns
    📅 Delivery: 7-12 days

    Fixed oxygen 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 24V DC, with 4-20mA, RS485, relay signal output, suitable for different kinds of situations.

    sisco fixed gas detector

    Anti-magnetic interference

    • The fixed oxygen 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 O2 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 oxygen O2 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-O2
    Detection Principle Electrochemistry
    Gas Oxygen (O2)
    Range (Optional) 0~30% Vol, 0~25% Vol
    Resolution 0.01%Vol
    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 2A (Optional USA plug & Europe plug)

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

    Fixed Oxygen (O2) 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: The necessity of detecting oxygen concentration

    Oxygen is a common gas raw material in industrial production, and the gas produced in industrial production is complex in composition and contains a large amount of combustible gas, most of which exceed the lower explosion limit. For safety reasons, the oxygen content must be controlled below a set threshold to keep the flammable components in the gas below the lower explosive limit. Otherwise, the combustible gas that reaches a certain concentration will explode when it comes into contact with the heat source, posing a threat to the safety of equipment and personnel. Therefore, it is necessary to monitor the change of oxygen concentration in such an environment in real time.

    The 3D printer industry, the glass bending machine industry, the high temperature boiler hanging pipe and other industries need to rush into inert gas such as nitrogen as a protective gas, so the content of oxygen should be strictly controlled. With the continuous development of science and technology, the technology of oxygen concentration detection has become more and more convenient. For the detection of hypoxia environment and the inspection and detection of trace oxygen, we can choose a suitable oxygen detector to complete it, which is more helpful for us to make appropriate preventive measures.

    The normal concentration of oxygen is about 20.9% by volume, and once the concentration of oxygen decreases, you will feel suffocation. For example, the altitude sickness that occurs in the plateau environment is that the oxygen concentration in the environment is thin, and the operation in the confined space often occurs due to poor ventilation due to lack of oxygen, causing harm to the operators. By using the fixed O2 gas detector to detect the oxygen concentration in the environment, it can be judged whether there is a lack of oxygen, the danger of explosion, or the quality of the produced products can be controlled by the oxygen concentration.


    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.
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