Shenzhen ZhongNuo Inspection Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas alarms, flammable gas detectors, toxic and harmful gas detectors, and other equipment in various facilities. We serve nationwide, providing solutions to electrical safety and explosion-proof fire prevention issues for customers, facilitating safe production.
Power-on inspection
After powering on the instrument, it should operate normally with clear and complete displays. 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 equipment using AC power should be no less than 20MΩ.

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

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

Appearance and structure
The instrument should not have any appearance damage that affects its normal operation. The surface of newly manufactured instruments should be smooth and glossy, with a uniform paint and plating layer, free of peeling and rusting.
The instrument's connections are reliable, and all dials or buttons should operate and control normally.
Logos and Symbols
Instrument name, model, manufacturer's name, date of manufacture, serial number, explosion-proof marking and number, as well as the manufacturing measurement instrument license marking and number for domestic instruments should be clear.
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 provide资质 to address fire and explosion prevention issues for our clients.