Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We provide services nationwide, addressing electrical safety and explosion-proof fire prevention issues for clients, 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 sites.
The standard was released 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 workplaces.

Power-on Inspection
After power on, the instrument should operate normally with clear and complete display. Check the alarm function and alarm trigger values.
Alarm function and alarm action value check
The instrument's acoustic and visual alarms should function normally. Insulation resistance.
Insulation resistance for instruments using AC power should not be less than 20MΩ.

Combustible Gas Detector Alarm Regular Inspection Content and Methods
Annual inspections of industrial and commercial alarm sensors are conducted regularly, primarily checking for the alarm sensor's indication error, repeatability, drift, and response time in compliance with standards. Additionally, the suitability of the alarm sensor's installation location and any interference from other equipment are also examined.

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 alarms generally does not exceed one year. This means that under normal circumstances, a comprehensive calibration and testing of the flammable gas alarm is required annually to ensure its performance meets the relevant requirements.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party service provider specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic/hazardous gas detection instruments. We offer regular calibration, measurement, and certification services, as well as qualifications to assist clients in solving fire and explosion prevention issues.