GRG5H infrared carbon dioxide sensor for mining explosion-proof high-precision detection

Description :

  The GRG5H infrared carbon dioxide sensor is a gas detection instrument designed based on the principle of non dispersive infrared (NDIR) absorption, mainly used for real-time monitoring of carbon dioxide concentration in ambient air. This device solves the pain points of traditional electrochemical sensors such as short lifespan, susceptibility to poisoning, and high susceptibility to temperature and humidity. It is particularly suitable for hazardous conditions such as underground coal mines, tunnel construction, and underground pipe galleries where explosive gas mixtures exist. By accurately capturing the absorption characteristics of carbon dioxide molecules towards specific wavelengths of infrared light, the GRG5H infrared carbon dioxide sensor can output stable and reliable concentration signals, providing core data support for ventilation system regulation, personnel safety warning, and environmental monitoring, ensuring that the air quality in the workplace meets safety standards.

  The GRG5H infrared carbon dioxide sensor strictly follows the mining electrical equipment standards in its specification design. The housing is usually made of high-strength engineering plastic or stainless steel material, which has excellent impact and corrosion resistance performance. Its core detection components use imported infrared light sources and detectors, combined with precision optical chambers, effectively avoiding cross interference. In terms of implementing standards, such products must comply with the GB3836 series electrical equipment standards for explosive environments and obtain the Coal Mine Mining Product Safety Mark Certificate (MA certification). Typical technical parameters include a measurement range of 0-5000ppm or 0-100% VOL, with a resolution of up to 1ppm and a response time of less than 30 seconds. The device is equipped with a built-in temperature compensation algorithm, which can maintain linearity error within ± 3% FS in a wide temperature range of -20 ℃ to+50 ℃. The protection level usually reaches IP65, and it is suitable for harsh on-site environments with high dust and high humidity.

  In the selection and application, the GRG5H infrared carbon dioxide sensor is mainly different from catalytic combustion or electrochemical gas detectors. Its biggest advantage is good long-term stability and long maintenance free cycle, making it particularly suitable for fixed installation scenarios that require continuous online monitoring. It is suitable for coal mining working faces, return air ducts, enclosed walls and other areas, and is also widely used for monitoring carbon dioxide accumulation in urban underground comprehensive pipe galleries, subway tunnels, and large storage spaces. If the monitoring object is other toxic and harmful gases such as carbon monoxide and hydrogen sulfide, corresponding specialized sensors must be selected and cannot be mixed. For general indoor air quality monitoring in non explosion proof areas, although it can be used, considering cost factors, it is recommended to choose the appropriate explosion-proof grade model according to actual explosion-proof requirements to avoid excessive performance or compliance risks.

  The installation of GRG5H infrared carbon dioxide sensor should be vertically suspended or fixed within 300mm from the roof and not less than 200mm from the side wall of the tunnel to ensure smooth airflow through the detection chamber. In daily maintenance, it is necessary to regularly use standard gas samples for zero and span calibration. It is recommended to calibrate at least once every six months to eliminate drift errors caused by optical window contamination. Common faults include high readings or no response, often caused by blocked air intakes, dust accumulation on optical lenses, or loose circuit connections. It is necessary to regularly clean the dust cover and check the tightness of the wiring terminals. The service life of equipment can usually reach 3-5 years, during which only a small number of vulnerable parts need to be replaced, and there is no need to frequently replace core sensing components, reducing the operation and maintenance costs throughout the entire life cycle.

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