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 at various locations. We offer services nationwide, addressing clients' electrical safety and explosion-proof fire prevention issues, and supporting 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 the alarm action 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 not be less than 20MΩ.

Standard for calibration and verification of flammable and toxic gas detectors:
GB/T50493-2019 "Design Standard for Detection and Alarm of Combustible Gases and Toxic Gases in Petroleum and Chemical Industry"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplace
JJG693-2011规程 for Calibration of Combustible Gas Detectors and Alarms

Regulatory Content and Methods for Regular Inspection of Flammable Gas Detectors and Alarms
Annual inspections of industrial and commercial alarm sensors are conducted regularly, primarily to check for the accuracy of the alarm indicator, repeatability, drift, and response time to ensure they meet standards. Additionally, the suitability of the alarm sensor's installation location and any interference from other equipment are also assessed.

Measurement Instrument Control
Instrument control includes calibration, follow-up calibration, and in-use inspection.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution that provides regular certification, measurement, and calibration services for electrical safety, electrical explosion-proofing, gas detectors, and toxic and harmful gas alarm instruments. We are qualified to help customers solve fire and explosion prevention issues.