Shenzhen ZhongNuo Testing Technology Co., Ltd. specializes in the calibration, certification, and metrological services for gas detectors, combustible gas detectors, and harmful gas detectors in various locations. We provide nationwide services to address electrical safety and explosion-proof fire prevention issues, helping clients ensure safe production.
Regulatory Content and Methods for Routine Detection of Flammable Gas Detectors
Annual inspections are conducted on the sensors of commercial and industrial alarms, 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.

Power-on inspection
After power on, the instrument should operate normally and display sections should be clear and complete. Check the alarm function and alarm action values.
Alarm function and alarm action value verification
The instrument's sound and light alarm should be normal. Insulation resistance
Insulation resistance for instruments using AC power should be no less than 20MΩ.

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 be expanded with isopropanol, etc. If the instrument does not specify the type of gas being measured, the concentration of the gas with a 60% increment in the alarm setting is approximately the full-scale value of the standard substance. The expanded uncertainty of the standard gas generating gas is not significant (%). The repeatability of the dilution device's flow rate indication error should not exceed a concentration of the gas standard substance. The concentration unit of the dilution device for the gas standard substance should be converted to match the unit of the inspected instrument, and should not be greater than 0.%.

What factors can affect the calibration cycle of a combustible gas detector alarm?
Manufacturer Requirements: Different manufacturers may have varying inspection cycle requirements for their flammable gas detectors. Therefore, when purchasing equipment, carefully review the product manual to understand the specific requirements of the manufacturer.
Equipment Operating Environment: The operating environment of the alarm can directly impact its inspection cycle. If the equipment is exposed to high concentrations of harmful gases, high or low humidity, or extreme temperatures for an extended period, the 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 frequently faces issues like battery depletion or sensor aging, the inspection cycle will accordingly be shortened.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party institution that provides regular calibration, measurement, and certification services for electrical safety, electrical explosion-proofing, gas alarms, and toxic/hazardous gas detectors, and is qualified to solve fire and explosion prevention issues for clients.