Table of Contents
Accurate pressure measurements are essential in many industrial and scientific applications. Proper calibration involves calculating zero-offset and span adjustments to ensure the readings are precise and reliable. This article explains the process of determining these adjustments for optimal sensor performance.
Understanding Zero-Offset
Zero-offset refers to the difference between the sensor’s reading at zero pressure and the actual zero point. It accounts for any inherent bias or drift in the sensor. Correcting zero-offset ensures that the sensor reads zero when no pressure is applied.
Calculating Zero-Offset
To determine the zero-offset, follow these steps:
- Apply a known zero pressure condition to the sensor.
- Record the sensor’s output reading.
- Subtract the known zero pressure value from the reading to find the offset.
Understanding Span Adjustment
Span adjustment corrects the sensor’s sensitivity across its measurement range. It ensures that the sensor’s output accurately reflects the applied pressure. Proper span calibration aligns the sensor’s readings with the actual pressure values.
Calculating Span Adjustment
To calculate span adjustment:
- Apply a known pressure higher than zero, within the sensor’s range.
- Record the sensor’s output at this pressure.
- Compare the output to the expected value based on the known pressure.
- Calculate the correction factor to align the sensor’s output with the actual pressure.
Adjustments are typically made by modifying calibration settings or applying correction factors during data processing to achieve accurate pressure readings.