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 nationwide services to address electrical safety and explosion-proof fire prevention issues for clients, contributing to safe production.
Gas Alarm Meters Calibration Conditions and Requirements
Environmental Conditions
Ambient Temperature: 0~40℃.
Relative humidity: ≤85%.
3. The working environment should not interfere with the normal operation of the instrument by electromagnetic fields or interfere with gas.
Inspection Gauges and Instruments
1) Standard Gas 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: Graduation 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 Relief Valve: A pressure relief valve that is compatible with the calibrated cylinder.
7) Gas Pipeline: Tube for gas pipelines that do not affect the concentration of the measured gas, such as polytetrafluoroethylene or stainless steel pipes.

Which gas detectors require regular calibration and verification?
Fixed-installed, handheld, portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm systems, flammable gas detectors/alarm systems, gas analyzers, etc.

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 a uniform paint and coating, free of peeling and rusting.
The instrument's connections are reliable, and all dials or buttons should operate and control normally.
Logos and Branding
Instrument name, model, manufacturer's name, production date, serial number, explosion-proof markings and numbers, as well as the manufacturing metrology license mark and number for domestic instruments, should be clear.

What factors influence the calibration cycle of flammable gas detectors?
Manufacturer Requirements: Different manufacturers' flammable gas detectors may have varying inspection cycle requirements. Therefore, when purchasing equipment, carefully review the product manual to understand the specific requirements of the manufacturer.
Equipment Usage Environment: The operating environment of the alarm directly affects its inspection cycle. If the equipment is continuously exposed to high concentrations of harmful gases, high or low humidity, or high or low temperatures, its inspection cycle may be accordingly shortened.
‌Equipment Maintenance Status: The condition of equipment maintenance is also a significant factor affecting the inspection cycle. If the equipment faces issues like battery depletion or sensor aging over a long period, the inspection cycle will accordingly be shortened.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party service provider specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas detection instruments for regular calibration, measurement, and certification. We hold the necessary qualifications to assist clients in addressing fire and explosion prevention issues.