Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, verification, and metrological services for gas alarms, flammable gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We hold the necessary qualifications to serve nationwide, addressing a range of electrical safety and explosion-proof fire prevention issues for clients, and contributing to safe production.
Power-on inspection
The instrument should operate normally after being powered on, with the display sections being clear and complete. Check the alarm function and alarm trigger values.
Alarm function and alarm action value verification
The instrument's sound and light alarm should be functioning normally. Insulation resistance
Insulation resistance for equipment using AC power should be no less than 20MΩ.

The detection principle of the instruments mainly includes catalytic combustion, infrared absorption, and thermal conductivity types. The sampling methods are diffusion and aspiration. The instruments are primarily composed of detection elements, amplification circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.

Gas Detector Alarm Calibration Specification Requirements
Regulation 5.5 of the "Provisions for the Verification of Flammable Gas Detectors" (JJG693-2011) states: The verification cycle for flammable gas detection and alarm instruments: the verification cycle of the instrument should generally not exceed one year. If there is any doubt about the instrument's measurement data, or if the instrument has been replaced with major components or repaired, it should be sent for verification promptly.
Section 3.5 of the "Regulations for the Use of Flammable Gas Detection and Alarm Systems" (SY6503-2000) stipulates: Flammable gas detection and alarm systems in use shall be calibrated regularly as per regulations.
Occupational Health Service (GBZ/T223-2009) Article 7.2.1 stipulates: Calibration of detection and alarm devices shall be conducted regularly according to the manufacturer's specified time and procedures.
Section 3.4 of the "Regulations for the Use of Flammable Gas Detectors and Alarms" (SY6503-2000) stipulates: Flammable gas detectors and alarms for installation and use shall have measuring instruments manufactured by recognized agencies with **measurement accuracy** and **explosion-proof performance**.

Measurement Instrument Control
Instrument control includes calibration, follow-up calibration, and in-service inspection.
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 for regular inspections, metrological measurements, and calibration services. We are qualified to provide solutions for fire and explosion prevention issues for our clients.