Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the certification, calibration, and metrological services for equipment such as gas alarms, combustible gas detectors, and toxic gas detectors for various locations. We hold qualifications to serve nationwide, addressing electrical safety and explosion-proof fire prevention issues for clients, and contributing to safe production.
Measurement Equipment Control
Instrument control includes calibration, follow-up calibration, and in-service inspection.

Gas Detector Alarm Calibration Specification Requirements
Regulation 5.5 of the "Regulation for the Verification of Flammable Gas Detectors" (JJG693-2011) stipulates: The verification cycle for flammable gas detection and alarm instruments: The verification cycle for the instrument is generally no more than 1 year. If there is any doubt about the measurement data of the instrument, or if the instrument has been replaced with major components or repaired, it should be submitted for verification promptly.
Section 3.5 of the "Code for the Use of Combustible Gas Detection and Alarm Devices" (SY6503-2000) stipulates: The combustible gas detection and alarm devices in use shall be calibrated regularly as required.
Occupational Health Service (GBZ/T223-2009) Article 7.2.1 stipulates: Calibration of detection and alarm devices shall be conducted regularly according to the manufacturer's specified time and procedures.
Regulation 3.4 of the "Standard for the Use of Combustible Gas Detectors and Alarms" (SY6503-2000) stipulates: The combustible gas detectors and alarms for installation and use should have measurement instruments manufactured by an authorized agency, as well as explosion-proof performance.

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 workplace operations.
The standard was issued 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, toxic, and harmful gases in workplace environments.

Which gas detectors require regular calibration and verification?
Fixed-installed, handheld, and portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm systems, flammable gas detectors/alarm systems, gas analyzers, etc.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is an independent third-party institution offering regular calibration, measurement, and certification services for electrical safety, electrical explosion-proofing, gas detectors, and toxic/hazardous gas alarm instruments. We hold the necessary qualifications to assist clients in solving fire and explosion prevention issues.