Shenzhen ZhongNuo Inspection & Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas detectors, flammable gas detectors, and toxic gas detection instruments, catering to various facilities. We provide national coverage to address a range of electrical safety and explosion-proof fire prevention issues, promoting safe production.
Standard for certification and metrological calibration of flammable and toxic gas detectors:
Standard GB/T50493-2019 for Design of Detection and Alarm Systems for Combustible Gases and Toxic Gases in Petroleum and Chemical Industries
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplaces
JJG 693-2011 "Regulation for the Verification of Combustible Gas Detectors"

What factors affect the calibration cycle of combustible gas detectors?
Manufacturer Requirements: Different manufacturers may have varying inspection cycle requirements for flammable gas detectors. Therefore, when purchasing equipment, carefully review the product manual to understand the specific requirements of the manufacturer.
Equipment Usage Environment: The operating environment of the alarm directly affects its inspection cycle. If the equipment is frequently exposed to high concentrations of harmful gases, high or low humidity, or high or low temperatures for extended periods, its inspection cycle may be shortened accordingly.
‌Equipment Maintenance Status: The condition of equipment maintenance is also a significant factor affecting the inspection cycle. If the equipment faces issues like battery depletion and sensor aging over a long period, its inspection cycle will correspondingly be shortened.

Appearance and structure
The instrument should not have any surface damage that affects its normal operation. The surface of newly manufactured instruments should be smooth and even, with a uniform paint and coating, and no signs of peeling or rust.
The instruments offer reliable connections, and all dials or buttons should operate and control normally.
Branding and logos
Instrument name, model, manufacturer's name, production date, serial number, explosion-proof mark and number, as well as the license mark and number of the domestically manufactured instrument, should be clear.

The calibration cycle for flammable gas detectors is typically once a year.
According to the standard JJG 693-2011 "Flammable Gas Detectors," the calibration cycle for flammable gas alarms generally does not exceed one year. This means that under normal circumstances, a comprehensive calibration and test of the flammable gas alarm should be conducted annually to ensure its performance meets the relevant requirements.
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 hold the necessary qualifications to address fire and explosion prevention issues for our clients.