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Flashcards in Ch 1 Deck (24)
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1
Q

Series of actions resulting in a change or change of state

A

Process

2
Q

changes the state of fluid inside a system

A

Process System

3
Q

Measures a process system variable and causes an action to maintain the process system variable at the desired value

A

Process Control System

4
Q

Condition, property or quantity that is being measured

A

Measured Variable

5
Q

Process system variable that is controlled at a desired value

A

Controlled Variable

6
Q

Process system variable that is acted on directly by the control action.

A

Manipulated Variable

7
Q

Information collected by control system

A

Control System Input

8
Q

Signal produced by control system to adjust the controlled variable.

A

Control System Output

9
Q

Desired value/setting for controlled variable.

A

Setpoint

10
Q

Difference between setpoint and measured variable.

A

Error Signal

11
Q

System response monitored in a closed loop system.

A

Feedback

12
Q

Measure and indicate process parameters without any conversion.

A

Direct Measurement

13
Q

Measuring devices that sense a physical property of the system and convert a change in that property into an indication.

A

Indirect Measurement Instrument

14
Q

Limits in which a quantity can be measured. It’s expressed by the lowest and highest quantity the device can measure.

A

Range

15
Q

Algebraic difference between highest and lowest values of quantity.

A

Span

16
Q

Ability of an instrument to measure the actual parameters value.

A

Accuracy

17
Q

Degree of agreement between repeated results.

A

Precision

18
Q

Slow changing of the displayed indication without changes in the system parameter.

A

Drift

19
Q

Measure of how well it can detect and indicate small changes in input.

A

Sensitivity

20
Q

Typically a numerical display of an instantaneous value of the measured variable.

A

Digital Display

21
Q

Continuous display representative of the process, has a range and span. Displayed in two ways: pointer moves on a fixed scale or pointer is fixed and scale moves.

A

Analog Display

22
Q

Apparent change in position of an object resulting from a change in position or direction from which object is viewed.

A

Parallax

23
Q

Do not ______ an analog display reading into specification. Record actual reading, contact supervisor.

A

Round off

24
Q

Indicator has input signal greater than 0 when it is indicating 0. Gives operator indication that instrument has failed.

A

Live Zero