Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, combustible gas detectors, and toxic and harmful gas detectors for various locations. We are fully licensed to serve nationwide, providing solutions for electrical safety and explosion-proof fire prevention issues, contributing to safe production.
GB 12358-2024 "General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplace" is an important standard.
Intended to standardize the performance, functions, and testing methods of environmental gas detection alarm instruments used in work场所.
The standard was issued in 1990 and has undergone several revisions.
The new version is GB 12358—2024, which will be officially implemented on June 1, 2025.
This standard applies to the production and use of detection and alarm instruments for flammable gases, toxic and harmful gases, and oxygen in workplace environments.

Gas Standard Material
The standard gas used should be of the same type as the gas measured by the instrument, such as methane or other gases; the standard gas can also be isopropanol, etc. If the instrument does not specify the type of gas being measured, the concentration of the gas (e.g., methane, ethane, or propane) at the set point should be approximately 60% of the full scale. The uncertainty of the expanded gas standard is not more than % (k-gas standard substance greater than ±1%); the flow indication error of the repetitive dilution device should not be greater than 0.%. The concentration unit of the gas standard substance should be converted to match the unit of the instrument being tested when in use. The concentration of the gas standard substance should not exceed 0.%.

The principle of instrument detection mainly includes catalytic combustion, infrared absorption, and thermal conductivity types. Sampling methods include diffusion and aspiration. The instrument is mainly composed of detection elements, amplifying circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.

Gas alarm detector regular inspection content
Installation spacing of inspection (probe) points
2. Installation Height of the Detector
3. Indicated Error (Concentration)
4. Repeatability (Concentration)
5. Alarm Error (Concentration)
6. Response Time (Seconds)
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution that specializes in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic/hazardous gas alarm instruments, providing regular inspections, metrological services, and calibration. We are licensed to help clients address fire and explosion prevention issues.