July 2013, Vol. 240 No. 7

Features

Determining Recalibration Intervals For Ultrasonic Meters At CEESI

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 calibration prior to use because a manufacturer cannot produce an instrument that measures a parameter, with reasonable uncertainty, without direct calibration. Pressure Transmitter Example 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 respo

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