Toxic and harmful gas detector purchase considerations
1. Confirm the type and concentration range of the gas to be tested:
All possible situations should be considered when selecting a gas detector.
If methane and other less toxic alkanes are the most common, the LEL detector is the most suitable. This is not only because the LEL detector has a simple principle and a wide application, but it also has the characteristics of convenient maintenance and calibration. If there are toxic gases such as carbon monoxide and hydrogen sulfide, it is necessary to select a specific gas detector to ensure the safety of workers.
If there are more organic toxic and harmful gases, considering the lower concentration of people who may cause poisoning, such as aromatic hydrocarbons, halogenated hydrocarbons, ammonia (amines), ethers, alcohols, fats, etc., you should choose the light introduced in the previous chapter. Ionize the detector and never use the LEL detector, as this can result in personal injury or death.
If the gas type covers the above types of gases, choosing a compound gas detector may achieve a multiplier effect.
2. Determine the use of the occasion:
The type of gas detector is different depending on the industrial environment.
A) Fixed gas detector: This is a detector that is used more on industrial equipment and in production.
It can be installed at a specific inspection point to detect specific gas leaks.
Its detection principle is the same as that described in the previous section, but it is more suitable in the process and technology for the continuous and long-term stability required for fixed detection.
They are also selected according to the type and concentration of the gas on site, and care should be taken to install them where the specific gas is most likely to leak, such as selecting the most effective height for sensor installation based on the specific gravity of the gas.
B) Portable gas detector: Due to the convenient operation of the portable instrument, compact size, and built-in sampling pump, the detection speed is fast and the precision is high; it can be carried to different places for detection and can be used after being turned on. As such instruments are used more and more widely in various factories and health departments.
3. Pay attention to the detection interference between different sensors
In general, each sensor corresponds to a specific test gas, but any gas detector cannot be absolutely special.
Therefore, when selecting a gas sensor, it should be as close as possible to the detection interference of other gases to the sensor to ensure its accurate detection of a specific gas.
4. Pay attention to the life of various types of sensors:
All kinds of gas sensors have a certain service life, that is, life.
In general, in portable instruments, the life of a LEL sensor can generally be used for about three years;
The life of an electrochemical specific gas sensor is generally two to three years;
The life of an electrochemical sensor depends on the dryness of the electrolyte, so if it is not used for a long time, it can be extended to a lower temperature environment to extend the service life.
Therefore, the sensor should be tested at any time, as much as possible during the life of the sensor, and if it fails, replace it in time.
5. Pay attention to the concentration measurement range of the test instrument:
All types of toxic and hazardous gas detectors have their own fixed detection range.
Only when the measurement is completed within its measurement range can the instrument be accurately measured.
If the measurement is exceeded for a long time beyond the measurement range, it may cause permanent damage to the sensor.
For example, in the 0-100 ppm range, if it is used in an environment exceeding 100 ppm, it is possible to completely burn the sensor. Therefore, before purchasing the instrument, be sure to confirm your range.
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