Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, calibration, and metrological services for equipment such as gas alarms, flammable gas detectors, and toxic gas detectors for various locations. We provide qualifications and services nationwide, addressing various electrical safety and explosion-proof fire prevention issues for clients, and promoting safe production.
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, amplification circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.

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 sites.
The standard was issued in 1990 and has undergone multiple 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 gas detection and alarm instruments for flammable gases, toxic and harmful gases, and oxygen in workplace environments.

Power-on inspection
The instrument should operate normally after being powered on, with the display sections being clear and complete. Check the alarm function and the alarm trigger values.
Alarm function and alarm action value verification
The instrument's audio-visual alarm should be normal. Insulation resistance
Insulation resistance for instruments using AC power should be not less than 20MΩ.

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 cycle 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 conducted annually to ensure their performance meets the relevant requirements.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution that provides regular certification, metrological verification, and calibration services for electrical safety, electrical explosion-proofing, gas detectors, and toxic/hazardous gas alarm instruments. We hold the necessary qualifications to address fire and explosion prevention issues for our clients.