Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We provide nationwide services, addressing clients' electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
Which gas detectors require regular calibration and verification?
Fixed installation, handheld, portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm systems, flammable gas detectors and alarms, gas detection meters, etc.

Gas Detector Alarm Calibration Standard Requirements
Regulation 5.5 of the "Regulation for Inspection and Verification of Combustible Gas Detectors" (JJG693-2011) stipulates: The inspection cycle for combustible gas detection and alarm instruments: Generally, the inspection cycle for the instrument should not exceed one year. If there is any suspicion about the instrument's measurement data, or if the instrument has been replaced with major components or repaired, it should be promptly sent for inspection.
Section 3.5 of the "Code for the Use of Combustible Gas Detection and Alarm Systems" (SY6503-2000) stipulates: The combustible gas detection and alarm systems in use shall be calibrated regularly in accordance with the regulations.
Occupational Health Service Station Toxic Gas Device Installation Specification (GBZ/T223-2009) Article 7.2.1 stipulates: Calibration of detection and alarm devices shall be carried out regularly according to the manufacturer's specified time and procedures.
Section 3.4 of the "Regulations for the Use of Combustible Gas Detectors" (SY6503-2000) stipulates that the installation and use of combustible gas detectors should have measurement instruments manufactured by an approved agency with ** explosion-proof performance **.

What factors can affect the calibration cycle of a flammable gas detector alarm?
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 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 or sensor aging over a long period, the inspection cycle will accordingly be shortened.

Power-on inspection
After power on, the instrument should operate normally with clear and complete display. Check the alarm function and alarm trigger values.
Alarm function and alarm action value verification
The instrument's acoustic and visual alarm should be functioning normally. Insulation resistance
Insulation resistance for instruments using AC power should be no less than 20MΩ.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas alarm instruments for regular inspections, metrological measurements, and calibrations. We are qualified to address fire and explosion prevention issues for our clients.