Shenzhen Zhongnuo Inspection Technology Co., Ltd. specializes in the calibration, certification, and measurement services for gas alarms, flammable gas detectors, and toxic gas detectors for various locations. We serve nationwide, providing solutions for electrical safety and explosion-proof fire prevention issues, facilitating safe production.
Gas Standard Material
The standard gas used should be of the same type as the gas measured by the instrument, such as methane or other gases; alternative options include isopropanol, etc. If the instrument does not specify the type of gas being measured, the concentration of the gas, such as methane, ethane, or警设定点涨度的气, at 60% should be approximately the full scale of the standard substance. The uncertainty of the expanded gas standard substance is not significant (%). The flow value error of the repeatability dilution device should not be greater than 0.%. The concentration unit of the gas standard substance should be converted to match the measuring unit of the inspected instrument when in use.

Regulatory and Methodical Inspection for Combustible Gas Detectors
Annual inspections of industrial and commercial alarm sensor probes are conducted regularly, primarily to check if the alarm sensors' indication errors, repeatability, drift, and response times comply with standards. Additionally, the suitability of the alarm sensor's installation location and any interference from other equipment are also examined.

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

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 due to electromagnetic fields and disturbing gases.
Inspection gauges 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 Unit: 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: Tube made of materials like polytetrafluoroethylene or stainless steel, which do not affect the concentration of the tested gas.
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 alarm instruments for regular inspections, metrological measurements, and calibrations. We hold the necessary qualifications to address fire and explosion prevention issues for our clients.