Silicon Piezoresistive Pressure Diaphragm Encapsulation Selection Criteria
Encapsulation selection balances gel potting low cost against oil-filled cell thermal stability to control long term zero drift and field recalibration expenses.
Full Scale Calibration Accuracy
Metrological Specification
Maximum measurement uncertainty across the total rated operating range defines the boundary of output deviation from true physical values under reference environmental conditions. In industrial pressure and force transducers, full scale calibration accuracy expresses maximum observed signal error as a percentage of total span. The specification applies strictly at factory reference temperature and pressure, excluding additional field environmental effects.
Reference Calibration
Precision pressure controllers apply incremental calibration steps from zero to maximum capacity while recording sensor output voltage. Calculating full scale calibration accuracy involves identifying the largest difference between measured voltage and ideal linear output, then dividing by full scale electrical span. High quality deadweight testers provide input pressure accuracy five times higher than the sensor under test.
Environmental Degradation
Temperature shifts and mechanical mounting torque introduce measurement errors that exceed initial laboratory limits. Although full scale calibration accuracy guarantees performance under controlled conditions, uncompensated thermal expansion in transducer housings degrades field precision. Periodic adjustments maintain operational accuracy within original equipment boundaries.
Verification Certificate
ISO seventeen zero two five accredited calibration facilities issue official compliance documentation verifying sensor measurement limits against national metrology standards. Calibration certificates document full scale calibration accuracy by listing individual calibration points, calculated linearity deviations, hysteresis values, and expanded measurement uncertainties across the entire operating range. Devices failing to meet stated percentage limits are rejected or reassigned to lower accuracy classifications prior to commercial distribution.