Shenzhen ZhongNuo Inspection & Technology Co., Ltd. specializes in the calibration, verification, and measurement services for gas alarms, combustible gas detectors, and toxic gas analyzers for various locations. We offer certifications and services nationwide, addressing electrical safety and explosion-proof fire prevention issues for clients, and contributing to safe production.
What factors can affect the calibration cycle of flammable gas detectors?
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 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 is long-term faced with issues such as battery depletion and sensor aging, the inspection cycle will accordingly be shortened.

Regular Inspection Items for Environmental Gas Detection and Alarm Equipment in Workplaces:
Alarm sound and light (if applicable)
2. Low response value
3. Indicating Error (for Gas Detectors/Gas Detector Alarms)
4. Instrument Drift (in Portable Instruments)
5. Alarm Error (for Gas Detection Alarm/ Gas Alarm)
6. Pump-Actuated Instrument Gas Sampling Distance and Flow Rate (for Pump-Actuated Instruments)
7. Power Supply (for battery-powered instruments)
8. Response Time
9. Status Indicator (with Wireless Communication Function)

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

How often should various gas detectors be calibrated and checked?
Instrument recalibration is typically every 1 year, determined by the submitting unit based on actual usage. During the secondary calibration process, if there are doubts about the instrument's test data, or if the main components of the instrument are replaced, or if recalibration is needed after repairs.
Shenzhen Zhongnuo Testing Technology Co., Ltd. is a third-party service provider specializing in electrical safety, electrical explosion-proofing, gas detectors, and toxic gas alarm instruments, offering regular calibration, metrological testing, and certification services. We are qualified to help customers solve fire and explosion prevention issues.