One more quiz Flashcards
Gauge Pressure
Pressure measured with atmospheric pressure as the zero point of the scale
Atmospheric Pressure
The pressure due to the mass of the atmosphere above the point where it is being measured
Absolute Pressure
Pressure measured with a perfect vacuum as the zero point of the scale
Vacuum Pressure
Pressure less than atmospheric pressured measured with atmospheric pressure as the zero point of the scale
Hydrostatic pressure
The pressure due to head of a column of liquid
Head Pressure
The actual height of a column of liquid
Differential pressure
The difference in pressure between two measurement points in a process point
pneumatic pressure
The pressure of air or other gases
Operating pressure
The actual pressure a device operates under normal conditions
Hydraulic pressure
The pressure of a confined liquid that has been subjected to the action of a pump or piston
zero adjustment
Means provided in an instrument to produce a parallel shift of the input output curve
LRV
The lowest value of the input or output
Linearity
Describes the closeness with witch the relationship between the input and output of an instrument represents a straight line
Range
Represents the limits, input and output, of the instrument
Final Control Element (FCE)
Physical device that affects changes in the manipulated variable
Disturbance
Change in the process which affects the value of the controlled variable
Span
Algebraic difference between the URV and LRV
Error (Deviation)
The algebraic difference between the indication and the ideal value of the measurement signal
Span adjustment
Means provide in an instrument to change the slope of the input-output curve
Transmitter
Convert signal from sensing element to a suitable output signal for processing by the controller
Transducer
A device that converts information of one physical form to another physical type on its output
URV
The highest value of the input or output
Variable
A level, quantity, or other condition that is subject to change
Set Point
Desired value of the controlled variable
Process Control
Manipulation of the energy or material input/output relationship to keep the controlled variables within the desired value
