Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, verification, and metrological services for gas alarms, combustible gas detectors, and toxic gas analyzers for various locations. We hold qualifications to serve nationwide, addressing all sorts of electrical safety and explosion-proof fire prevention issues for clients, and contributing to safe production.
Regular inspection content for gas detectors
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)

Combustible Gas Detector Alarm Regular Inspection Content and Methods
Annually, we conduct annual inspections on the sensors of commercial and industrial alarm systems, primarily checking for the accuracy, repeatability, drift, and response time of the alarms to ensure they meet standards. Additionally, we verify the suitability of the alarm installation location and check for any interference from other equipment.

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

GB 12358-2024 "General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplaces" is an important standard.
Intended to standardize the performance, functions, and testing methods of environmental gas detection alarm instruments used in work places.
The standard was published 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.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic gas detection equipment for regular inspections, metrological measurements, and calibration services. We are qualified to address fire and explosion prevention issues for our clients.