Isolated Silicon Pressure Cell Oil Dosing Volume Tolerances and Temperature Hysteresis
Isolated silicon cell thermal hysteresis depends directly on micro-dosing oil volume accuracy and outer diaphragm compliance balance.
Pressure Cell Calibration
Transducer Scaling
Metrological procedures establish the relationship between the electrical output of a transducer and a known reference pressure. This pressure cell calibration involves applying a series of precise loads and recording the resulting signal. It identifies the zero point, the span and any non-linearity in the device.
The process is conducted in a temperature-controlled environment to ensure repeatability.
Zero Adjustment
The first step is to record the signal when no pressure is applied to the sensor. During pressure cell calibration, this value is used to set the baseline for all subsequent measurements. Any shift in this value over time is known as zero drift.
Span Correction
Technicians apply the maximum rated pressure to determine the full scale output of the device. If the output does not match the target value, the pressure cell calibration coefficients are adjusted to scale the signal correctly. This ensures the sensor provides the full resolution over its entire range.
Reference Source
Primary standards like dead weight testers provide the traceable pressure used for the verification. A pressure cell calibration is only as accurate as the instrument used to perform it. National laboratories verify these references to maintain the chain of traceability.