Determining Recalibration Intervals For Ultrasonic Meters At CEESI

摘要

Calibration is based on the comparison of a measuring instrument and a standard. Calibration may include adjustment of the instrument to match the standard. Every measuring instrument requires since calibration prior to use because a manufacturer cannot produce an instrument that measures a parameter, with reasonable uncertainty, without direct calibration. A pressure transmitter, for example, exposes a diaphragm to an unknown pressure. A sensor detects the resulting diaphragm deflection and produces an electronic signal. The signal is processed to result in a numerical value stored in a computer. The prediction of the diaphragm deflection and sensor response involves a large number of parameters, some of which may be unknown. The only way to account for these parameters is by direct comparison with a pressure standard.