Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and measurement services for equipment such as gas alarms, combustible gas detectors, and toxic gas detection instruments for various locations. We offer services nationwide, addressing clients' electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
How often should various gas detectors be periodically calibrated and tested?
The recalibration period for instruments is typically one year, determined by the submitting unit based on actual usage. During the re-certification process, recalibrate the instrument if there are doubts about the test data, or if the main components of the instrument are replaced, as well as after repairs where re-certification is required.

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 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.

The detection principle of the instruments mainly includes catalytic combustion, infrared absorption, and thermal conductive types. The sampling methods are diffusion and aspiration. The instruments are primarily composed of detection elements, amplification circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.

Standard for calibration and verification of flammable and toxic gas detectors:
GB/T50493-2019 "Design Standard for Detection and Alarm Systems of Combustible and Toxic Gases in Petroleum and Chemical Industries"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarming Instruments in Workplaces
JJG693-2011 "Regulation for Calibration of Combustible Gas Detectors"
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution that provides regular certification, measurement, and calibration services for electrical safety, electrical explosion-proofing, gas detectors, and toxic and harmful gas alarm instruments, as well as资质 to help customers address fire and explosion prevention issues.