The calibration of gas alarms is a key step in ensuring their accuracy and reliability, and its methods and cycle management need to be determined comprehensively based on equipment type, usage environment, and industry standards.
There are three main calibration methods:
Open lid adjustment method: directly open the alarm shell for debugging, simple operation but high risk, suitable for short-term adjustment in non hazardous environments.
Magnetic rod adjustment method: non-contact calibration is performed on the adjustment point of the sensor glass cover through a magnet, which has high safety and is suitable for magnetically adjustable sensors.
Infrared adjustment method: using a remote control for remote calibration, with a high safety factor, but the domestic technology is not yet mature and the cost is high, mostly used in large enterprises or professional scenarios.
Cycle management should follow the following principles:
General standard: According to the "General Technical Requirements for Gas Detection and Alarm Instruments in Workplace Environment" (GB12358-2024), the calibration cycle of alarm devices shall not exceed 1 year, and the inspection cycle shall not exceed 3 years.
Environmental differences:
Adverse environments (such as chemical, petroleum, and coal mines): corrosive gases, high dust, or frequent use can accelerate sensor aging. It is recommended to calibrate every 3-6 months.
Clean environment (such as office and home): minimal environmental interference, calibration cycle can be extended to 1-2 years.
Gas type: Alarm devices for detecting highly corrosive gases (such as chlorine and hydrogen sulfide) require more frequent calibration (3-6 months), while alarm devices for detecting non-toxic gases (such as carbon dioxide) can have a longer calibration cycle.
Equipment type: Electrochemical sensors have high sensitivity but short lifespan. It is recommended to calibrate every 6-12 months; The infrared sensor has good stability and the cycle can be extended to 1-2 years.
Management suggestion:
Select qualified institutions: Priority should be given to calibration institutions certified by CNAS to ensure the authenticity and reliability of data.
User self inspection: Regularly test the alarm function and promptly send it for inspection if sensitivity decreases.
Record traceability: Establish calibration files, record time, results, and responsible persons for easy tracking and management.