What are the main functions of toxic and harmful gas detectors?
Toxic and harmful gas detectors and combustible gas detectors are specialized safety and health detectors used to detect flammable or toxic gas content that may be present in the air of hazardous workplaces or equipment, such as chemicals, and are instruments that alarm when the content exceeds the limit.
Toxic and harmful gas detectors are mainly used in the following situations:
1. Maintenance inspection: After equipment maintenance and replacement, it is more important to detect residual harmful gases or liquids, especially before hot work.
2. Leakage detection: Detection and alarm of harmful gases or liquids in equipment pipelines on site, and leakage detection during equipment pipeline operation.
3. When conducting patrol inspections for safety and hygiene, harmful gases or liquids should be detected.
4. Emergency detection: In case of abnormal situations or accidents at the production site, it is necessary to detect harmful gases or liquids for safety and hygiene.
5. Entry detection: When personnel enter the hazardous substance isolation operation room, enter the drainage ditch, cable trench, or equipment in hazardous areas for operation, they must detect harmful gases or liquids.
How to choose a gas detector and what aspects to consider
1. Confirm the type and concentration range of gas to be detected
If methane and other less toxic alkanes are predominant, an LEL detector can be chosen. Because the LEL detector has a simple principle and wide application, it also has the characteristics of convenient maintenance and calibration. If there are toxic gases such as carbon monoxide and hydrogen sulfide, priority should be given to selecting the gas detector corresponding to the gas to be detected. If it is an organic toxic and harmful gas, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amine), ethers, alcohols, lipids, etc., a photoionization detector can be selected. If the gas types cover the above types of gases, it is recommended to choose a composite gas detector.
2. Determine the usage scenarios of gas detectors
If it is in an open environment, such as an open workshop, a portable gas detector that can be worn with you can be used, which can continuously, real-time, and accurately display the concentration of toxic and harmful gases on site. Usually equipped with vibration or light alarm accessories to avoid audible alarms in noisy environments, and computer chips are installed to record peak values and other information, providing specific guidance for workers' health and safety.
If entering a confined space, such as reaction tanks, storage tanks or containers, sewers or other underground pipelines, underground facilities, agricultural enclosed granaries, railway tankers, shipping cargo holds, tunnels, etc., personnel must undergo testing before entering, and testing must be conducted outside the confined space. At this point, it is best to choose a multi gas detector with a built-in sampling pump. It can be equipped with multiple gas detection sensors required on a single instrument, and it has the characteristics of small volume, light weight, fast response, and simultaneous display of multiple gas concentrations.
