Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and metrological services for gas alarms, combustible gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We hold qualifications to serve nationwide, providing solutions to electrical safety and explosion-proof fire prevention issues for clients, and contributing to safe production.
The instrument's detection principles primarily include catalytic combustion, infrared absorption, and thermal conductivity types. The sampling methods are diffusion and aspiration. The instrument is mainly composed of detection elements, amplification circuits, alarm systems, and displays, used for monitoring the concentration of combustible gases in the environment.

Regular Inspection Content for Gas Detectors
Installation spacing of inspection (detection) points
2. Installation Height of the Detector
3. Indicating Error (Concentration)
Repetitive (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 affect the normal operation of the instrument with electromagnetic fields and interfering gases.
Calibration Tools and Instruments
1) Gas Standard Material
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 rate not less than 500 mL/min, flow grade not less than 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 polyethylene or stainless steel that do not affect the concentration of the measured gas.

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 clean, with even paint and plating coatings, free of peeling and rusting.
The instrument's connections are reliable; all dials or buttons should operate and control normally.
Branding and Logos
Instrument name, model, manufacturer, date of manufacture, serial number, explosion-proof marking and number, as well as the manufacturing metrological instrument license marking and number for domestically produced 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 gas detection instruments, providing regular calibration, measurement, and certification services. We are qualified to address fire and explosion prevention issues for our clients.