All Categories
    Menu Close

    Fixed Formaldehyde (CH2O) Gas Detector, 0 to 10/20/50/100 ppm

    Formaldehyde CH2O gas detector is a fixed type gas online monitor, with detecting range of 0 to 10/20/50/100 ppm, output signal 4-20mA and RS485, fast response within 10s. CH2O gas detector with sound and light alarm, has 24-hour real-time display and infrared remote control, high accuracy and reliability.
    SKU: GD300-CH2O
    i h
    🚚 Free shipping
    🔙 30-day returns
    📅 Delivery: 7-12 days

    Fixed CH2O gas detector is used to detect and monitor formaldehyde concentration. The formaldehyde gas detector has remote control with optional output signal 4-20mA&RS485, with functions of sound & light alarm, real time display and 24 hours online work.

    sisco fixed gas detector

    Anti-magnetic interference

    • The fixed formaldehyde 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 CH2O 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 formaldehyde CH2O 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-CH2O
    Detection Principle Electrochemistry
    Gas Formaldehyde (CH2O)
    Range (Optional) 0-10 ppm
    0-20 ppm
    0-50 ppm
    0-100 ppm
    Resolution 0-10 ppm, 0-20 ppm, 0-50 ppm, 0-100 ppm, 0-500 ppm, 0-1000 ppm
    Accuracy 0.01ppm (0-10/20/50ppm), 0.1ppm (0-100ppm), 1ppm (0-500/1000ppm)
    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 Formaldehyde (CH2O) 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 formaldehyde gas

    The fixed gas detector is generally fixed on the wall, but different heights will affect the accuracy of the gas detector, which is a major focus of installing it.

    When the formaldehyde concentration is too high, the oxygen content in the air can be significantly reduced, causing suffocation. When the CH2O in the air reaches 25%-30%, it can cause headache, dizziness, fatigue, inability to concentrate, rapid breathing and heartbeat, and ataxia. If you don't get away in time, it can cause suffocation and death. Skin contact with liquefied formaldehyde can cause frostbite. Analysis of GWP (Global Warming Potential) shows that the greenhouse effect of formaldehyde is 25 times greater than that of carbon dioxide. This is because there is already so much carbon dioxide in the atmosphere that many wavelengths of radiation have long been absorbed. Therefore, most of the newly added carbon dioxide can only exert its absorption effect at the edge of the original absorption band. Conversely, some lesser amounts of greenhouse gases, including formaldehyde, absorb wavelengths that have not been effectively intercepted, so each additional molecule provides a new absorption capacity. Therefore, some companies should install fixed formaldehyde gas detectors, whether for safety or environmental reasons. The fixed formaldehyde gas detector is a special instrument for detecting the concentration of CH2O in the atmosphere. When the preset value of the instrument is exceeded, the alarm will immediately send out an audible and visual alarm, thereby effectively preventing the occurrence of harmful accidents.


    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.
    0.0 0
    Write your own review Close