Shenzhen ZhongNuo Inspection Technology Co., Ltd. specializes in the certification, calibration, and metrological services for gas alarms, flammable gas detectors, toxic and harmful gas detectors, and other equipment in various locations. We provide qualifications and services nationwide, addressing all types of electrical safety and explosion-proof fire prevention issues for our clients, and contributing to safe production.
Gas Standard Material
We use standard gas substances of the same type as the gas measured by the instrument, such as methane, ethane, or other gases; the standard gas can also be isopropanol, etc. If the instrument does not specify the type of gas being measured, the concentration of the gas at the set point (e.g., 60% for methane, ethane, etc.) should be approximately the full scale of the standard substance. The uncertainty of the expanded gas standard substance is not significant (%). The flow indication error of the repeatability dilution device should not be greater than 0.1% for high concentration gas standard substances. The concentration unit of the dilution device for the gas standard substance should be converted to match the units of the inspected instrument, and the discrepancy should not exceed 0.1%.

Regulatory contents and methods for periodic inspections of flammable gas detectors
Annual inspections are conducted on the sensors of commercial and industrial alarm systems, primarily checking for measurement errors, repeatability, drift, and response times in compliance with standards. Additionally, the suitability of the alarm system's installation location and any interference from other equipment are assessed.

Gas alarm regular inspection contents
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)

Which gas detectors require regular calibration and verification?
All types of in-use fixed, handheld, portable gas detectors, gas alarm instruments, toxic and harmful gas detectors/alarm, flammable gas detectors/alarm, gas analyzers, etc.
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 inspections, metrological verification, and calibration. We hold the necessary qualifications to address fire and explosion prevention issues for our clients.