Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and measurement services for gas alarms, flammable gas detectors, toxic and harmful gas detectors, and other equipment at various locations. We provide nationwide services to address various electrical safety and explosion-proof fire prevention issues for clients, promoting safe production.
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 and alarm instruments used in work places.
The standard was published 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 gas detection and alarm instruments for flammable gases, toxic and harmful gases, and oxygen in work environments.

Regular inspection contents for gas alarms
Installation spacing of inspection (testing) points
2. Installation Height of the Detector
3. Indicated Error (Concentration)
4. Repeatability (Concentration)
5. Alarm Error (Concentration)
6. Response Time (Seconds)

How often should various gas detectors be periodically calibrated and tested?
The recalibration time for instruments is typically 1 year, to be determined by the submitting unit based on actual usage. During the re-certification process, if there are doubts about the instrument's test data, or if the main components of the instrument are replaced, or if recalibration is needed after repair.

Which gas detectors require regular calibration and verification?
Fixed installation, handheld, portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm, flammable gas detectors with alarms, gas detection instruments, etc.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas detectors, and toxic gas alarm instruments for regular inspections, metrological measurements, and calibration services. We are qualified to address fire and explosion prevention issues for our clients.