How to buy the right gas detector?
Gas detector is a variety of gas safety protection in the important practical tools, can always detect at our surrounding dangerous gas concentration, and timely alarm signal to remind the safety. Therefore, for all kinds of different production occasions and detection requirements, choose the right gas detector is every person engaged in safety and health work are very careful. How to buy the right gas detector?
(1) Confirm the type of gas to be detected and the concentration range:
Each production sector is encountered by different types of gases. When choosing a gas detector it is important to consider all possible scenarios. If methane and other less toxic alkanes are predominant, the choice of LEL detector is undoubtedly the most appropriate. This is not only because the LEL detector is simple and widely used, but also because it is easy to maintain and calibrate.
If there are toxic gases such as carbon monoxide, hydrogen sulphide, etc., it is important to prioritise a specific gas detector in order for workers to be safe. If more organic toxic and hazardous gases are present, taking into account their lower concentrations that may cause personnel poisoning, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amines), ethers, alcohols, lipids, etc., the photoionisation detector introduced in the previous chapter should be selected, and *** do not use LEL detector to cope with the situation as it may lead to injuries and deaths.
If the gas type covers the above categories of gases, choose a composite gas detector may achieve twice the result with half the effort.
(2) Determine the use of the occasion:
Different industrial environments, the choice of gas detector types are different.
(A) Fixed gas detector:
This is a detector that is used more often on industrial installations and in the production process. It can be installed at a specific detection point to detect a specific gas leak. Fixed detector is generally two-body type, there are sensors and transmission composed of the detection head as a whole installed in the detection site, there are circuits, power supply and display alarm device composed of secondary instrumentation as a whole installed in the safety of the place, easy to monitor. Its detection principle is the same as described in the previous section, only in the process and technology is more suitable for fixed detection required by the continuous, long time stability and other characteristics. They should also be selected according to the type and concentration of the gas on site, and attention should also be paid to installing them in the parts where the particular gas is most likely to leak, such as selecting the most effective height of the sensor installation according to the specific gravity of the gas and so on. Such as SK-600-T series online gas detector.
(B) Portable gas detector:
As portable instruments are easy to operate, compact size, can be carried to different parts of the production, electrochemical detector using alkaline battery power supply, can be used continuously for 10 hours; new LEL detector, PID and composite instruments using rechargeable batteries (some of which have been used non-memory nickel-metal hydride or lithium-ion batteries), so that they can generally work continuously for nearly 12 hours, so as this type of instrument in various types of Factories and health departments are becoming more and more widely used as this type of instrument.
If it is in the open occasions, such as open workshop use this type of instrument as a safety alarm, you can use the diffusion gas detector to wear, because it can be continuous, real-time, accurate display of the site of the concentration of toxic and harmful gases. Some of these newer instruments are also fitted with vibration alarm attachments - to avoid inaudible audible alarms in noisy environments - and computer chips to record peaks, STELs (15-minute short-term exposure levels) and TWAs (8-hour statistically weighted averages) - providing specific guidance for worker health and safety.
