Shenzhen ZhongNuo Inspection Technology Co., Ltd. specializes in the certification, calibration, and metrological services for equipment such as gas detectors, combustible gas detectors, and harmful gas detection instruments for various locations. We hold qualifications to serve nationwide, providing solutions for electrical safety and explosion-proof fire prevention issues for clients, facilitating safe production.
Gas Alarm Meters Calibration Conditions and Requirements
Environmental Conditions
Ambient Temperature: 0~40℃.
Relative Humidity: ≤85%
3. The working environment should not interfere with the normal operation of the instrument by electromagnetic fields and interfering gases.
Calibration Tools and Instruments
1) Gas Standard Material
The relative expanded uncertainty of the gas standard material does not exceed 2% (k=2).
2) Standard Gas Dilution Unit: Dilution Error of 1%.
3) Stopwatch: Graduation not greater than 0.1s.
4) Flow Control: Flow range not less than 500 mL/min, flow grade not less than level 4.
5) Zero Point Gas: Purified compressed air.
6) Pressure Reducing Valve: A pressure reducing valve that matches with the calibrated cylinder.
7) Gas Pipeline: Tubing made of materials such as polytetrafluoroethylene or stainless steel that do not affect the concentration of the measured gas.

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 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 detection and alarm instruments for flammable gases, toxic and harmful gases, and oxygen in workplaces.

How often should various gas detectors be periodically tested and calibrated?
The recalibration period for instruments is typically one year, to be determined by the submitting unit based on actual usage. During the secondary 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 alarm regular inspection content
Installation spacing of testing points
2. Installation Height of the Detector
3. Indicated Error (Concentration)
Repetitive (Concentration)
5. Alarm Error (Concentration)
6. Response Time (Seconds)
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution that provides regular certification, metrological testing, and calibration services for electrical safety, electrical explosion-proofing, gas alarms, and toxic/hazardous gas detection instruments. We are qualified to address fire and explosion prevention issues for our clients.