Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, flammable gas detectors, toxic and harmful gas detectors, and other equipment, serving various locations nationwide. We address a range of electrical safety and explosion-proof fire prevention issues for clients, contributing to 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场所.
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 gases, toxic and harmful gases, and oxygen in work places.

Standard for calibration and verification of flammable and toxic gas detectors:
GB/T50493-2019 "Standard for Design of Detection and Alarm Systems for Combustible and Toxic Gases in Petroleum and Chemical Industries"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplace
JJG693-2011 "Regulation for Calibration of Combustible Gas Detectors"

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 secondary calibration process, recalibrate the instrument if there are any doubts about the test data, or if the main components of the instrument are replaced, as well as after repairs.

Appearance and structure
The instrument should not have any appearance damage that affects its normal operation. The surface of newly manufactured instruments should be smooth and clean, with even paint and plating coatings, and free from peeling and rusting.
The instrument's connections are reliable, and all dials or buttons should operate and control normally.
Logos and branding
Instrument name, model, manufacturer, date of manufacture, serial number, explosion-proof marking and number, as well as the manufacturing measurement instrument license mark and number of domestic instruments, should be clear.
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 calibrations. We hold the necessary qualifications to address fire and explosion prevention issues for our clients.