GB/T 43859-2024 in English
VALIDTest method for performance of water activity meters
- Issued on:2024-04-25
- Implemented on:2024-04-25
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 43859-2024水分活度仪性能测定方法》由TC481（全国仪器分析测试标准化技术委员会）归口，主管部门为科技部。
Introduction
In-depth interpretation of GB/T 43859—2024 water activity meter performance determination method
1. Background and significance of standard formulation
Water activity is an important indicator for measuring bound water and free water in a substance, and is widely used in food, medicine, cosmetics and other fields. With the advancement of science and technology, the performance requirements of water activity meters are increasing. The formulation of GB/T 43859—2024 fills the gap in the domestic standardized test methods in this field and provides a unified technical basis for instrument production and application.
2. Comparative analysis of standard frameworks
| Dimensions | GB/T 43859—2024 | Comparison standards |
|---|---|---|
| Scope of application | Water activity meters with temperature control function, instruments without temperature control function can be used as reference | - |
| Test conditions | Ambient temperature (±5℃), relative humidity (≤85%), power supply requirements, etc. | - |
| Performance indicators | Water activity indication error, repeatability, temperature indication error, etc. | - |
3. Recommendations for Standard Implementation
Instrument calibration and test environment control:
- Ensure that the test environment meets the temperature (25±5℃) and humidity (≤85%) requirements
- Use certified reference materials or saturated sodium chloride solution as reference standards
- When calibrating the instrument, it is recommended to perform multiple measurements at different temperature points to verify stability
Performance index test method:
- Water activity indication error: Use 5 standard solutions to test separately and calculate the deviation
- Repeatability: Measure the same solution 7 times under the same conditions and calculate the coefficient of variation
- Temperature control deviation: Test volatility and deviation at 20℃, 25℃ and 30℃ respectively
Notes:
- Avoid strong electromagnetic interference and mechanical vibration from affecting test accuracy
- Calibrate the sensor regularly to ensure that the temperature measurement error is within the allowable range
- Clean the sample chamber promptly after use to prevent corrosive substances from remaining
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