Classifications and Typical Products of Gas Detection Instruments
Gas‑detection instruments form a broad product category referring to instruments for measuring gas‑leak concentrations, mainly including portable / hand‑held gas detectors. They are classified in multiple ways according to functions and application scenarios. The following introduces these classifications to help users select suitable products.
Classification by Detected Gas Type There are combustible‑gas detectors, toxic‑gas detectors, common‑gas detectors and special‑gas detectors. The price of common combustible‑toxic gas detectors generally ranges from several hundred to several thousand currency units, while special‑gas detectors cost several thousand to over ten thousand units. Common combustible‑toxic gas detectors feature high cost‑performance and reliable performance. Special‑gas detectors meet unique testing requirements with high accuracy yet come at a high price.
Classification by Application Environment General‑purpose type and explosion‑proof type. General‑purpose instruments are manufactured in compliance with national standards and fit most environments, priced from several hundred to several thousand units with favorable cost‑performance. Explosion‑proof models satisfy detection requirements for hazardous special sites and are relatively more expensive.
Classification by End‑user Household‑use and industrial‑use. Household gas detectors cost dozens to over one hundred units. They are cost‑effective and easy‑to‑operate; users only need to install them properly at designated positions and connect power supply. They can interlock with gas shut‑off valves for automatic risk elimination at the source. Industrial gas detectors require strict performance indicators
and must comply with national and industry safety standards. Their prices range from several hundred to several thousand units.
Classification by Function Single‑gas detectors and multi‑gas detectors. Single‑gas detectors are widely used to measure one specific target gas. Multi‑gas detectors include six‑in‑one, five‑in‑one and four‑in‑one detectors to satisfy requirements for detecting different numbers of gas species.
Classification by Operation Mode Portable (hand‑held) type and fixed (mounted / wall‑mounted) type. Portable detectors are used by on‑site personnel for pre‑job safety gas measurement according to actual working conditions. Fixed detectors realize long‑term uninterrupted monitoring to ensure site safety without manual on‑site operation and support intelligent interlocking functions.
Classification by Sampling Method Diffusion type and pump‑suction type. Diffusion gas detectors are widely adopted with relatively low prices ranging from several hundred to several thousand units. Pump‑suction gas detectors are more expensive, usually above several thousand units, for special‑site demands.
Classification by Detection Principle For combustible‑gas measurement: catalytic‑combustion, semiconductor, thermal‑conductivity and infrared‑absorption types. For toxic‑gas measurement: electrochemical type and semiconductor type.
