The measurement accuracy of thermal mass flowmeters is influenced by various factors, including the instrument model, fluid type, flow range, and installation conditions. Typically, it falls within the range of ±0.5% to ±5% of the reading, with specific scenarios as follows:
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High-precision models: Suitable for laboratories, precision industrial control, etc. For clean gases (such as air, nitrogen) within their calibrated flow range, the accuracy can reach ±0.5%~±1% of the reading, and some high-end products can even approach ±0.2%.
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Industrial general-purpose models: Used for conventional process monitoring, with an accuracy of mostly ±1%~±2% of the reading, applicable to common fluids like natural gas and process gases.
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Under special conditions: When measuring low-velocity, high-viscosity liquids or fluids containing a small amount of impurities, the accuracy may drop to ±2%~±5% of the reading; if the fluid properties differ significantly from the calibrated medium (e.g., without recalibration), the error may further increase.
In addition, the repeatability (short-term stability) is usually better than the accuracy, generally within ±0.1%~±0.5%, which is more important for dynamic flow monitoring. In practical applications, it is necessary to select a suitable model based on specific working conditions (such as fluid cleanliness and temperature range) to ensure accuracy.
Post time: Jul-01-2025