What are the Different Types of Gas Detector?

User:JXCTUpload time:Mar 03 2023

What are the Different Types of Gas Detectors?

There are many types of gas detectors. Below are some classifications of gas detectors from different angles to help you choose which type of detector to buy.

According to different detection gases, there are combustible gas detectors, toxic gas detectors, ordinary gas detectors, special gas detectors, etc. Prices vary, from hundreds to thousands, or even tens of thousands.

gas sensors

Classified by function, there are single-gas detectors and multi-gas detectors. The single gas detector is mainly used to detect one gas in the detection occasion. Multi-in-one gas detectors include four-in-one gas detectors, five-in-one gas detectors, six-in-one gas detectors, etc., which can detect the presence of one or more gases with one device. Commonly used multi-gas detectors are 4 gas detectors for monitoring LEL, CO, O2 and H2S gas leakage.

Gas leakage alarm equipment
Gas leakage alarm equipment

According to the way of use, it can be divided into portable (handheld) and fixed (online, wall-mounted)

According to the way of use, it can be divided into portable (handheld) and fixed (online, wall-mounted). Which type of gas detector to choose usually depends on the usage scenario. Portable gas detectors are used for on-site operators to conduct safety inspections before operation. The fixed gas detector mainly realizes long-term continuous detection to ensure on-site safety, without on-site personnel control, and can be intelligently interconnected.

According to the sampling method, there are diffusion type and pump suction type. Diffusion gas detectors perform gas detection by contacting the gas in the detected area. This means that workers must enter where the detected gas is located. However, the cost is relatively low. The pump gas detector can draw gas samples through the built-in pump, so the response time is fast, allowing the staff to measure at a long distance and ensuring the safety of the staff.

According to the detection principle, there are many types of gas sensors for detecting different gases, including electrochemical, semiconductor, oxidation, catalytic, photoionization, infrared, etc.

Electrochemical  sensors
Electrochemical sensors

How to calibrate a gas detector?

After the gas detector is used for a period of time, the accuracy of the instrument will be affected by factors such as the use environment, sensor loss, misoperation or interfering gases. In order to ensure the accuracy and safety of the instrument, the gas detector must be calibrated regularly. Generally, the gas detector is calibrated once a year, strictly speaking, the instrument is calibrated every six months or every three months. The more calibration times, the less likely the detector is to drift, and the better the detection effect.

In simple terms, the calibration of a gas detector requires two steps: first, zero the instrument in "air" that does not contain the gas to be measured; second, calibrate the instrument with a standard gas of known concentration. For the specific calibration process of the JXCT portable gas detector, it is recommended that you refer to the user manual.