Shenzhen ZhongNuo Inspection Technology Co., Ltd. specializes in the certification, calibration, and metrological services for equipment such as gas alarms, combustible gas detectors, and toxic/hazardous gas detection instruments for various locations. We provide national coverage and assist customers in solving all sorts of electrical safety and explosion-proof/fire prevention issues, contributing to 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 audio-visual alarm should be functioning normally. Insulation resistance.
Insulation resistance for equipment using AC power should not be less than 20MΩ.

Regulatory contents and methods for regular detection of flammable gas detectors
Annual inspections are conducted on the sensors of commercial and industrial alarm systems, primarily checking for measurement errors, repeatability, drift, and response times to ensure compliance with standards. Additionally, the suitability of the alarm system's installation location and any interference from other equipment are assessed.

Gas Alarm Detector Regular Inspection Content
Installation spacing of inspection points
2. Installation Height of the Detector
3. Indicated Error (Concentration)
Repeatability (Concentration)
5. Alarm Error (Concentration)
6. Response Time (Seconds)

Gas Alarm Meters Calibration Conditions and Requirements
Environmental Conditions
Ambient Temperature: 0~40℃.
2. Relative Humidity: ≤85%
3. The working environment should not interfere with the normal operation of the instrument by electromagnetic fields or interfere with gases.
Calibration Tools and Instruments
1) Certified Reference Materials for Gases
The relative expanded uncertainty of the gas standard material does not exceed 2% (k=2).
2) Standard Gas Dilution Device: Dilution error of 1%.
3) Stopwatch: Resolution not greater than 0.1s.
4) Flow Control: Flow range not less than 500 mL/min, flow grade not less than Level 4.
5) Zero Point Gas: Purified compressed air.
6) Pressure Reducing Valve: A pressure reducing valve that matches with the calibrated cylinder.
7) Gas Pipeline: Tubing made of materials like polytetrafluoroethylene or stainless steel that do not affect the concentration of the measured gas.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas detectors, and toxic gas alarm instruments for regular inspections, metrological measurements, and calibration services. We hold the necessary qualifications to address fire and explosion prevention issues for our clients.