Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in the calibration, certification, and measurement services for gas detectors, flammable gas detectors, and toxic gas detection instruments for various locations. We offer nationwide services to address electrical safety and explosion-proof fire prevention issues for clients, promoting safe production.
Regulatory Contents and Methods for Routine Detection of Flammable Gas Detectors
Annual inspections are conducted on the sensors of commercial and industrial alarm systems, primarily checking for the accuracy, 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.

Which gas detectors require regular calibration and verification?
All types of in-service fixed, handheld, and portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm, flammable gas detectors/alarm, gas analyzers, etc.

Standard for verification and calibration of combustible and toxic gas detectors:
GB/T 50493-2019 "Design Standard for Detection and Alarm Systems of Combustible Gases and Toxic Gases in Petroleum and Chemical Industries"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplaces
JJG 693-2011 "Regulation for the Verification of Combustible Gas Detectors"

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 and interfering gases.
Inspection Gauges and Instruments
1) Certified Reference Materials for Gases
The relative expanded uncertainty of the gas standard material is not greater than 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 lower than 4.
5) Zero Point Gas: Purified compressed air.
6) Pressure Reducing Valve: A pressure reducing valve that is compatible with the calibrated cylinder.
7) Gas Pipeline: Tubing made of materials like polytetrafluoroethylene or stainless steel that do not affect the concentration of the tested gas.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarm systems, and toxic and harmful gas detection instruments, offering regular inspections, metrological measurements, and calibration services. We are qualified to solve fire and explosion prevention issues for our clients.