Chapter 84- Introduction To Instrumentation Flashcards
1
Q
Two types of instruments
A
Controls
Indicators and switches
2
Q
Two types of controls
A
Closed loop and open loop
3
Q
Open loop is also called
A
Manual control
Operator makes adjustments based on what the indicators tell him
4
Q
A closed loop is defined as
A
An automatic control where the devices communicate with each other in order to maintain the desired set point
5
Q
A set point is the
A
Desired value of the process variable
6
Q
Error is a
A
Difference between the process and the set point variable
7
Q
Disturbance
A
A change in the process that is unrelated to any adjustment the control instruments make
