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 used in various locations. We provide services nationwide, addressing all sorts of electrical safety and explosion-proof fire prevention issues for our clients, and contributing to safe production.
How often should various gas detectors be periodically tested and calibrated?
Instrument recalibration is typically every 1 year, determined by the submitting unit based on actual usage. During the secondary calibration process, if there are doubts about the instrument's test data, or if the main components of the instrument are replaced, as well as after repairs, a recalibration 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场所.
The standard was issued in 1990 and has undergone several revisions.
The new version is GB 12358—2024, to 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 workplaces.

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

Verification Method
Appearance and structure
Inspect and feel according to the requirements of Section 4.1
Logos and Branding
Inspect in accordance with the requirements of Section 4.2.
Power-on inspection
Inspect visually and by touch, as per 4.3 requirements, to check the alarm function and alarm action values according to 5.3.4.
Introduce a standard gas substance with a concentration greater than the alarm set point, causing the instrument to trigger an alarm. Observe if the instrument's audio-visual alarm is functioning normally and record the instrument's reading when it alarms. Repeat the measurement three times; the arithmetic mean of the three readings is the instrument's alarm trigger value.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic and harmful gas detection instruments. We offer regular inspections, metrological services, and calibration. We are qualified to address fire and explosion prevention issues for our clients.