Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We hold the necessary qualifications to serve nationwide, addressing clients' electrical safety and explosion-proof fire prevention needs, and 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 and 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.

The calibration cycle for flammable gas detectors is typically once a year.
In accordance with the standard JJG 693-2011 "Flammable Gas Detectors," the calibration period for flammable gas detectors generally does not exceed one year. This means that under normal circumstances, a comprehensive calibration and testing of the flammable gas detectors should be carried out annually to ensure their performance meets the relevant requirements.

How often should various gas detectors be calibrated and tested?
The recalibration period for instruments is typically one year, to be determined by the submitting unit based on actual usage. During the re-calibration process, if there are any doubts about the instrument's test data, or if the main components of the instrument are replaced, as well as after repairs, a recalibration is required.

Gas Standard Material
The standard gas should use gas standard substances of the same type as the gas measured by the instrument, such as methane, ethane, or a gas standard such as isopropanol can be used. If the instrument does not specify the type of gas being measured, the concentration of the gas with a 60% margin for error in the range of , , or should be about the full scale. The uncertainty of the expanded gas standard substance is not significant (%), and the repeatability of the standard gas substance should not be more than ±1%. The flow indication error of the dilution device should not be greater than 0.%. The concentration unit of the gas standard substance should be converted to match the units of the measuring instrument, and the difference should not exceed 0.%.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas alarm instruments for regular inspections, metrological measurements, and calibration services. We provide qualifications to help clients address fire and explosion prevention issues.