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 in various locations. We hold qualifications to serve nationwide, addressing clients' electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
The principle of instrument detection mainly includes catalytic combustion, infrared absorption, and thermal conductivity types. Sampling methods include diffusion and aspiration. The instrument is primarily composed of detection elements, amplification circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.

Measurement Instrument Control
Instrument control includes calibration, follow-up calibration, and in-use inspection.

Power-on inspection
After power is applied to the instrument, it should operate normally with clear and complete displays. Check the alarm function and alarm setpoints.
Alarm function and alarm action value verification
The instrument's sound and light alarm should be normal. Insulation resistance
Insulation resistance for instruments using AC power should be no less than 20MΩ.

Gas Detector Alarm Calibration Specification Requirements
Regulation 5.5 of the "Procedures for Verification of Combustible Gas Detectors" (JJG693-2011) states: The verification cycle for combustible gas detection and alarm instruments: the verification cycle for the instrument generally should not exceed one year. Instruments with suspected measurement data, instruments that have replaced major components, or those repaired should be promptly submitted for verification.
Section 3.5 of "Regulations for the Use of Combustible Gas Detectors and Alarms" (SY6503-2000) stipulates: The combustible gas detectors and alarms in use shall be calibrated periodically as per regulations.
Occupational Health Service Establishment Code (GBZ/T223-2009) Article 7.2.1 stipulates: Calibration of detection and alarm devices should be carried out regularly according to the manufacturer's specified time and procedures.
Section 3.4 of "Regulations for the Use of Flammable Gas Detectors and Alarms" (SY6503-2000) stipulates: Flammable gas detectors and alarms for installation and use should have measuring instruments manufactured by recognized institutions and **explosion-proof performance**.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic/hazardous gas alarm instruments for regular inspections, metrological measurements, and calibration services. We are qualified to assist clients in solving fire and explosion prevention issues.