In fields such as industrial production, environmental monitoring, and emergency rescue, portable gas detectors play a vital role as important safety equipment. Among them, diffusion and pump suction are the two main types of gas detectors.

(OC-904 Diffusion handheld gas detector)

The working principle of diffusion portable gas detectors relies on the natural diffusion of gas molecules. This type of detector usually places the probe in the area to be detected, and the gas molecules in the space naturally flow into the probe for detection. When gas molecules enter the gas chamber of the detector, the sensor senses and identifies these gases, and then feeds back the concentration value of the gas in real time.

The advantage of the diffusion detector is that it has a simple structure and low cost, so it is suitable for use in some indoor and outdoor open and wide range environments. However, since the detection results are easily interfered by factors such as environmental wind speed, temperature and humidity, the accuracy of the diffusion detector may have a certain drift value error.

(OC-905 pump gas detector)

The pump-type portable gas detector has a small built-in gas sampling pump. This pump can actively draw the gas to be measured into the detector for detection, so the detection speed is faster and the alarm response time is shorter. Pumped detectors are usually equipped with replaceable water vapor dust filters to ensure the accuracy of test results.

The advantages of the pump-type detector are its fast detection speed and high accuracy, and it can achieve long-distance measurement through an external sampling extension tube. This gives pump-type detectors significant advantages in complex environments such as underground mines, tunnels, pipelines, and sewers. However, due to its complex structure, the cost is relatively high.

(OC-903 pump gas detector)

In practical applications, which type of detector to choose depends on the specific use environment and needs. For example, where fast response and precise measurement are required, a pump-type detector is a better choice; whereas where the cost budget is limited or the environment is relatively simple, a diffusion detector is more cost-effective.

In addition, portable gas detectors, whether diffusion or pumped, require regular calibration and maintenance to ensure their accuracy and reliability. Users should read the instruction manual carefully before use to understand the performance characteristics and precautions of the detector, and use it within the validity period of the sensor.