Three sampling and detection methods for gas detectors that must be known
A gas detector is a hazardous gas protection device. It can detect the concentration of toxic and harmful substances in our work. When the gas concentration passes the safety line, it will sound an alarm, effectively reminding operators. The gas detector has three sampling and detection methods. Let's take a look together~
1. Diffusion sampling
The diffusion type gas detector slowly flows gas into the instrument for detection through natural airflow, following the free flow of air, in order to obtain results.
The diffusion gas detector can accurately and in real-time check whether the air contains toxic and harmful substances. Diffusion gas detectors are commonly used in open spaces, such as open work workshops. This method is influenced by environmental monitoring, such as environmental temperature, wind speed, etc. Due to the lack of a suction pump, the sampling speed of the diffusion gas detector is slow, and the detection results are easily affected by external factors such as wind speed and temperature in the detection environment, resulting in certain errors.
2. Pump suction sampling
The pump suction gas detector is equipped with a miniature suction pump, which is started by the power supply to extract gas from the sampling point area, and then send the sample gas to the gas detector for detection.
Pump suction gas detectors are generally suitable for places where some people are not suitable or easy to enter, or where detection must be carried out before operators enter. For example, in tunnels, pipelines, sewers, enclosed agricultural granaries, railway tankers, tanks, etc., pump suction detectors can be installed on air pumps with long pipes for ventilation and remote suction sampling. The advantages of pump suction gas detectors include fast detection speed, high accuracy, and the ability to measure over long distances.
3. Pipeline sampling
In addition to diffusion and pump suction sampling, fixed gas detectors also have a type of pipeline sampling.
The pipeline gas detector has a thread at one end of the probe. During installation, open an opening of the same size on the pipeline, and connect the probe tightly to the pipeline without any air leakage. So as to achieve real-time detection inside the pipeline. The pipeline detector is suitable for environments with low pipeline flow rate and normal temperature and pressure.
