In the field of industrial safety and occupational health management, the scientific selection and standardized operation of harmful Gas Detectors are the key links to prevent the risk of gas leakage and ensure the safety of personnel. When selecting, it is necessary to first clarify the nature and concentration range of the detected gas: if the environment is dominated by methane, propane and other alkane combustible gases, the LEL Detector based on the principle of catalytic combustion is preferred, and its measurement range is usually 0-100% LEL, the calibration cycle can be up to 6 months, and the maintenance is convenient; When there are toxic gases such as carbon monoxide and hydrogen sulfide, a special Detector for electrochemical sensors is required, such as a CO Detector that generates a current through redox reaction, and the detection accuracy can reach 1ppm. In volatile organic compounds scenarios such as chemical tank farms, the PID photoionization Detector can cover the detection range of 0.1-10000ppm, and respond quickly to benzene series.
Matching of usage scenarios is equally important. The installation of the fixed Detector needs to be based on the layout of the gas specific gravity: the methane specific gravity of 0.55 is easy to accumulate at the top, the sensor should be 30-50cm away from the roof, the specific gravity of hydrogen sulfide 1.19 needs to be close to the ground 10-20cm, and to meet the requirements of the explosion-proof level, the signal can be connected to the DCS system for remote monitoring. Among the portable instruments, the open space inspection can be diffusion, with a battery life of about 12 hours and is equipped with sound and light vibration alarms; To enter the confined space such as the reactor, a pump-suction multi-Gas Detector must be used, and the built-in sampling pump can pump the gas 10 meters away, and detect oxygen, combustible gas and toxic gases at the same time, and it also needs to have STEL and TWA calculation functions; For emergency rescue, a response time of ≤ 10 seconds is required.
In the use process, calibration is the basis to ensure accuracy, it needs to be calibrated with zero gas and standard gas, and must be recalibrated after replacing the sensor, and the standard gas detection response should be applied before use. At the same time, it is important to be aware of interference between different sensors, such as the cross-response of certain combustible gases to electrochemical sensors. There is a significant difference in the service life of various types of sensors: LEL sensors can be used for about three years, electrochemical sensors are mostly used for 1-2 years, and oxygen sensors are about one year. In addition, the Detector has a fixed detection range, beyond which the sensor may be damaged and must be used within the specified range.
From the judgment of gas properties, the adaptation of scene requirements to the operation and maintenance specifications, the refined control of the whole process can make the harmful Gas Detector truly become a solid barrier for industrial safety. Whether it is daily inspection, confined space operation or emergency rescue, only the selection and use based on scientific principles can control the risk of gas leakage at the source and build a reliable line of defense for personnel safety and production stability.
