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Gas detector purchase
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With the national standards for toxic and harmful gas emissions more stringent, it is strictly prohibited to exceed the standard of enterprise gas emissions, and forbid the toxic gas content exceeding the standard of workplaces. It is necessary for enterprises to install gas detectors and monitor the gas concentration in workplaces. Of course, the instrument purchase and use of attention is also an important prerequisite to ensure the stability of the instrument work.
Outai will prompt you to buy the instrument should strictly follow the following points:
1. confirm the type and concentration range of gas to be detected:
All possible conditions should be taken into consideration when selecting a gas detector.
(1) if the methane and other less toxic alkanes are in the majority, the LEL detector is undoubtedly the most appropriate one. This is not only because the principle of LEL detector is simple and widely used, but also it has the characteristics of convenient maintenance and calibration. If there is carbon monoxide, hydrogen sulfide and other toxic gases, it is necessary to give priority to the choice of a specific gas detector to ensure the safety of workers.
②If more is organic toxic and harmful gases, taking into account the concentration may cause poisoning is low, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amine), ether, alcohol, fat and so on, photoionization detector should be the choice before the introduction, but definitely do not deal with the use of LEL detector, because it may cause casualties.
③If the gas species cover the above categories of gases, the choice of a composite gas detector may be able to achieve twice the result with half the effort.
All kinds of toxic and harmful gas detectors have their fixed detection range.
Only when the measurement is completed within the range of determination can the instrument be accurately measured.
The sensor can cause permanent damage to the sensor if it is measured for a long time beyond the measuring range.
For example, the 0-100ppm range, if accidentally used in more than 100ppm of the environment, it is possible to completely burn the sensor. So, before purchasing the instrument, be sure to confirm your own range.
3. determine the use of occasions:
Different industrial environment, the choice of gas detector types are also different.
A) fixed gas detector: This is a tester that is used more frequently in industrial installations and production processes.
①It can be installed on a specific detection point to detect a specific gas leak.
②It is the principle with section above, only in the process and technology is more suitable for long time continuous and stable characteristics required for fixed detection.
They should also be selected according to the type and concentration of the gas on site, and at the same time pay attention to installing them in the areas where the most likely gas leaks, for example, the most effective height of the sensor installed according to the specific gravity of the gas.
B) portable gas detector: portable instrument, easy to operate, small size, built-in sampling pump, fast detection, high precision; can be carried to different places to detect, boot can be used. As a kind of instrument, it has been widely used in various factories and health departments.
4. pay attention to the detection interference between different sensors
In general, each sensor corresponds to a specific detection gas, but any gas detector can not be absolutely special effects.
Therefore, in the selection of a gas sensor, should be as much as possible to understand other gases on the sensor detection interference, in order to ensure its accurate detection of specific gases.
5. pay attention to the life of all kinds of sensors:
All kinds of gas sensors have a certain service life, that is, life expectancy.
Generally speaking, in portable instruments, the life of LEL sensors can generally be used for about three years;
The lifetime of an electrochemical specific gas sensor is typically two to three years;
The lifetime of the electrochemical sensor depends on the drying of the electrolyte, so if it is not used for a long time, it will extend the service life of the sensor in a lower temperature environment.
Therefore, the sensor should be detected at any time, as far as possible in the effective period of the use of the sensor, once failed, timely replacement.
