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 at various locations. We hold qualifications to serve nationwide, addressing all types of electrical safety and explosion-proof fire prevention issues for our clients, and contributing to safe production.
Regulatory contents and methods for periodic inspections of flammable gas detectors
Annual inspections of industrial and commercial alarm sensors are conducted regularly, primarily to check for the accuracy of the alarm indicators, repeatability, drift, and response time against standards. Additionally, the suitability of the alarm installation location and any interference from other equipment are assessed.

Power-on inspection
Upon power-on, the instrument should operate normally with clear and complete displays. Check the alarm function and the alarm trigger values.
Alarm function and alarm action value verification
The instrument's audio-visual alarm should function normally. Insulation resistance
Insulation resistance for instruments using AC power should be no less than 20MΩ.

How often should various gas detectors be calibrated and checked?
Instrument recalibration is typically done every 1 year, determined by the submitting unit based on actual usage. During the re-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 re-calibration is required.

What factors can affect the calibration cycle of a combustible gas detector alarm?
Manufacturer Requirements: Different manufacturers' combustible gas detectors may have varying inspection cycle requirements. 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, 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 frequently encounters issues such as battery depletion or aging sensors, its inspection cycle will correspondingly be shortened.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is an independent third-party organization specializing in electrical safety, electrical explosion prevention, gas detectors, and toxic gas alarm instruments for regular calibration, measurement, and verification services. We hold the necessary qualifications to address our clients' fire and explosion prevention needs.