The accuracy of a pressure transmitter is the core indicator for measuring its measurement accuracy, but the idea that "higher accuracy is always better" is a common misconception. Blindly pursuing high accuracy will significantly increase unnecessary costs. Only by selecting the appropriate accuracy level according to the actual application scenario can we achieve the most economical and efficient solution.
As a benchmark enterprise in the domestic pressure transmitter field, FRD Sensor has been deeply engaged in the industry for 24 years. We have a full range of products from 0.0075 grade ultra-high accuracy to 0.5 grade economical type, providing tailor-made precise measurement solutions for industries such as petrochemical, heating, water affairs, pharmaceutical, and new energy.
- Meanings of Full Scale Accuracy and Reading Accuracy
Reading (%RD) Accuracy: An error proportional to the measured value, with a basically constant relative error throughout the full measurement range.
Full Scale (%FS) Accuracy: A fixed error proportional to the measurement range, expressed as a percentage of the full scale. The relative error will increase when measuring small ranges.
- Static Accuracy
Refers to the accuracy at a specific reference temperature (usually 25°C), which is the nominal accuracy of the transmitter. Industry general classification:
0.01~0.1% FS: Ultra-high accuracy
0.1~1% FS: High accuracy
1~2% FS: General accuracy
2~10% FS: Low accuracy
- Full Temperature Range Accuracy
Refers to the comprehensive accuracy within the entire specified operating temperature range of the transmitter, including the additional error caused by temperature drift. A transmitter with a static accuracy of 0.1% FS may only have a full temperature range accuracy of 0.5% FS or even lower.
High-accuracy transmitters require more complex manufacturing processes, multi-point calibration and temperature compensation technologies, resulting in a substantial increase in cost and selling price. Therefore, reasonable accuracy indicators and temperature ranges should be proposed according to the actual application scenarios and requirements.
The accuracy of a pressure transmitter indicates the credibility of the measured value. Under specified conditions, the confidence probability that the measurement error does not exceed the maximum allowable error is usually 99.7% (3σ).
Accuracy calculation formula:
Example: For a pressure transmitter with an accuracy class of 0.1 and an output of 4-20mA:Output allowable error = Output range × Accuracy class = 16mA × 0.1% = ±0.016mAThat is, the maximum possible error of the output signal of this transmitter is ±0.016mA.