問題一覧
1
The portion of the measuring means which first either utilizes or transforms energy from the controlled medium to produce an effect which is a function of change in the value of the controlled variable
PRIMARY ELEMENT
2
A device which produces an output control signal as a function of an input error signal.
CONTROLLER
3
The process energy or material of which the manipulated variablc is a condition or characteristic
CONTROL AGENT
4
The collective functions performed in and by the equipment in which a variable is to be controlled.
PROCESS
5
The difference between the set point and measured variable.
ERROR
6
The desired value of the process variable
SET POINT
7
Device for converting a signal of one sort into one of another type.
TRANSDUCERS
8
Any operable combination of one or more automatic controllers connected in closed loops with one or more processes
AUTOMATIC CONTROL SYSTEM
9
That quantity or condition which is measured and controlled.
CONTROLLED VARIABLE
10
The quantity or condition which is affected by the automatic controller as to affect the value of the controlled variable
MANIPULATED VARIABLE
11
Process energy or material in which a variable is controlled.
CONTROLLED MEDIUM
12
A signal which is a measure of the process variable gencrally the output of a measuring istrument or transmitter.
MEASURED VARIABLE
13
A device that changes the value of the measured variable to standard signal that can be easily sent to other instruments.
TRANSMITTERS
14
The value of the controlled variable which under any fixed set of conditions, the automatic controller operates to maintain
CONTROL POINT
15
The relationship of the controller output to the input error
CONTROL MODE
16
A device which can be manipulated by the controller output signal to regulate the flow of energy or material to a process
FINAL CONTROL ELEMENT
17
A controller response in which the final control clement is moved immediately from one extreme to the other extreme of its stroke as a result of a small change in the controlled variable.
ON-OFF RESPONSE
18
The difference between the set point and the control point of a proportional controller.
OFFSET
19
A change in process conditions which requires a change in the position of the final control element to maintain the desired control point
LOAD CHANGE
20
The range of values through which the controlled variable must vary to cause the final control element to move from one extreme to the other.
THROTTLING RANGE OR PROPORTIONAL BAND