Portable gas detector from the detection principle is mainly divided into two kinds: diffusion and pump suction type.The so-called portable, just as the name implies for easy to carry and design, mobile, flexible application.When choosing a portable instrument, you need to consider the practical application environment suitable for use.
Functions that a portable gas detector should have:
1. The direct-reading digital screen can quickly display the current gas concentration.
2. With record storage, the sampling interval can be set, and the current concentration data can be automatically recorded according to requirements.
3. It has sound and light and vibration prompts when the gas exceeds the standard.
4. Equipped with a rechargeable lithium battery or a replaceable battery can ensure the power reserve of continuous use for more than several hours.
5. The weight and volume of the equipment. Many portable gas detectors have different sizes and weights. Then we need to consider the appropriate volume and weight according to our own usage and application characteristics.
The working principles of the portable gas detector are: diffusion sampling and pumping sampling. The two main characteristics are as follows.
1. The diffusion type consumes less power, and the equipment volume can be made smaller. The gas detection is similar to the human body's olfactory mode, and the gas concentration detection is completed after the gas diffusion contacts the sensor.
2. Pumping type, because the air pump is used for sampling, the power consumption and volume must be slightly larger and heavier, but the air sampling with the help of the air pump can quickly and accurately locate the point that needs to be detected. It is more suitable for and needs pumping sampling and detection conditions, such as detecting the gas concentration in the pipeline and the gas concentration in the sealed space, which require a pumping gas detector to be more convenient to use and detect.