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Beijing Pusanda Instrument Technology Co., Ltd
Calibration cycle and accuracy verification method for temperature and humidity test chamber sensors
Date: 2025-11-24Read: 0
Temperature and humidity test chamberThe accuracy of the test data is highly dependent on the precision of the built-in sensors. Once the sensor drifts or fails, it will render the entire experiment invalid and even lead to product misjudgment. Therefore, establishing a scientific calibration cycle and verification method is crucial.
1、 Recommended calibration cycle
Conventional usage environment: Temperature sensors are recommended to be calibrated once a year, while humidity sensors are recommended to be calibrated every 6-12 months due to their susceptibility to contamination and aging;
High load or harsh working conditions (such as frequent high and low temperature impacts, high humidity salt spray environments): Calibration should be shortened to every 6 months;
CNAS accredited laboratories must develop a calibration plan based on risk assessment in accordance with ISO/IEC 17025 requirements and maintain a complete traceability chain.
2、 Accuracy verification method
External standard comparison method:
Use a high-precision temperature and humidity recorder certified by the metrology institute (such as PT100 temperature probe+capacitive humidity sensor, accuracy ± 0.1 ℃/± 1.5% RH), place its probe in the center and corner of the test chamber (at least 5 points), run for 2 hours under typical working conditions (such as 25 ℃/60% RH, 85 ℃/85% RH), and record the deviation value.
Multi point distribution test:
According to JJF 1101 "Calibration Specification for Temperature and Humidity of Environmental Testing Equipment", conduct temperature fluctuation, uniformity, and humidity deviation tests under no-load conditions to determine the overall performance of the sensor.
Self diagnostic function assistance:
Some intelligent test chambers have sensor health monitoring functions, which can prompt "abnormal signal" or "slow response" as a calibration trigger basis.
3、 Precautions
Calibration should be carried out after the equipment has been preheated and stabilized;
Avoid reading during defrosting or humidification transients;
The humidity sensor should not be wiped with alcohol to avoid damaging the sensitive film;
All calibration reports must include uncertainty analysis and be traceable to national standards.
By standardizing calibration and regular verification, it can be ensured thatTemperature and humidity test chamberLong term under control, providing reliable assurance for product quality and R&D data.