Sensors for measurement and control

Two of the most important considerations for a measurement system are accuracy and reliability. Clearly, a measurement is of little use if it is substantially inaccurate. It may be possible to allow for a consistent error in an instrument if it is known, but low frequency, randomly occurring errors will mean that incorrect actions may be taken by the operator as a result of reading that instrument, or by the control system employing it as a sensor. High frequency random variations in the measurement 

Trensmitter (electronic torque balance unit -Section 6.3.3) 

LVDT—linear variable differential transformer, A/D—analogue to digital, VDU—visual 

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Devices for converting nonelectrical effects and signals to electrical signals. This group includes numerous sensors for measuring and controlling the temperature, pressure, linear accelerahons, vibrahons, various mechanical and acoustic parameters, how rates and the consumption of liquids, and similar... 

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