Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, verification, and metrological services for equipment such as gas alarms, combustible gas detectors, and toxic/hazardous gas analyzers for various venues. We hold the necessary qualifications to serve nationwide, addressing clients' electrical safety and explosion-proof fire prevention issues, and contributing to safe production.
Regular Calibration Content for Gas Alarm Sensors
Installation spacing of inspection (probe) points
2. Installation Height of the Detector
3. Indicated Error (Concentration)
4. Repeatability (Concentration)
5. Alarm Error (Concentration)
6. Response Time (seconds)

Standard for verification and calibration of combustible and toxic gas detectors:
GB/T50493-2019 "Design Standard for Detection and Alarm of Combustible and Toxic Gases in Petroleum and Chemical Industries"
GB12358-2006 General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplaces
JJG693-2011 "Regulation for Calibration of Combustible Gas Detectors"

Gas Standard Material
We use gas standard substances of the same type as the gas measured by the instrument, such as methane or ethane, or gas standards can also use isopropanol, etc. If the instrument does not indicate the type of gas being measured, the concentration of the gas at the set point (60% of the full scale) is approximately the concentration of the standard substance. The uncertainty of the expanded gas standard substance is not significant (%). The flow indication error of the repetitive dilution device should not be greater than 0.1% for gas standard substances with a concentration not exceeding 0.1%. The concentration unit of the dilution device for gas standard substances should be converted to match the unit of the instrument being tested, and the discrepancy should not exceed 0.1%.

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, it's essential to 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 frequently exposed to high concentrations of harmful gases, high or low humidity, or high or low temperatures for extended periods, its inspection cycle may be shortened accordingly.
‌Equipment Maintenance Status: The condition of equipment maintenance is also a significant factor affecting the inspection cycle. If the equipment consistently faces issues like battery depletion and sensor aging, the inspection cycle will accordingly be shortened.
Shenzhen ZhongNuo Testing Technology Co., Ltd. is a third-party institution specializing in electrical safety, electrical explosion-proofing, gas alarms, and toxic and harmful gas detectors, providing regular verification, measurement, and calibration services. We hold qualifications to assist clients in solving fire and explosion prevention issues.