Control MTexam Page 3 Flashcards
A term used in the calculation of heat transfer by convection.
Coefficient of heat transfer
A term used to determine the amount of linear expansion due to heating or cooling.
Coefficient of thermal expansion
A device which compares two signals and outputs the difference.
Comparator
A plate with a hole located at its center (orifice plate) used to measure flow by measuring the differential pressures either side of the plate.
Concentric plate
The movement of heat energy in a material by the transfer of energy from one molecule to another.
Conduction
An instrument using two electrodes to measure fluid level.
Conductivity probe
A flow equation which states that, if the overall flow rate is not changing with time, the flow rate past any section of the system must be constant.
Continuity equation
A level measurement that is continuously updated.
Continuous level measurement
The variable measured to indicate the condition of the process output.
Controlled variable
The element in a process-control loop that evaluates any error of the measured variable and initiates corrective action by changing the manipulated variable.
Controller
The movement of heat by the motion of warm or hot material.
Convection
A device that changes the format of a signal but not the type of energy used as the signal carrier, i.e., voltage to current.
Converter
The signal to the manipulated variable.
Correction signal
A device that converts a digital signal into an analog voltage or current.
DAC
A device for calibrating pressure-measuring devices, which uses weights to provide the forces.
Dead weight tester
