Control MTexam Page 1 Flashcards
The accuracy stated as a definite amount, i.e., not as a percentage
Absolute accuracy
Position measured from a fixed point
Absolute position measurement
Pressure measured with reference to a perfect vacuum.
Absolute pressure
A sensor for measuring acceleration or the rate of change of velocity.
Accelerometer
A measure of the difference between the indicated value and the true value.
Accuracy
A device that performs an action on one of the input variables of a process according to a signal received from the controller.
Actuator
An analog-to-digital converter that converts an analog voltage or current into a digital signal.
ADC
A warning that a variable has exceeded set limits.
Alarm
Current that flows in one direction during one-half of a regular time period and the opposite direction during the other half
Alternating current
An instrument for measuring electrical current or electron flow. Ampere The unit of current or electron flow.
Ammeter
An electrical circuit that increases the magnitude of a signal.
Amplifier
A continuously varying signal.
Analog
A barometer which uses an evacuated capsule as a sensing element.
Aneroid barometer
A solution containing water.
Aqueous solution
The pressure acting on objects on the earth’s surface caused by the weight of the air in the earth’s atmosphere, normally
Atmospheric pressure
