Chapter 109 Flashcards
The actual value of a controlled variable
Control point
What consists of a sensor controller and a final control element
Electric control system
A device such as an valve or damper that changes the value of the controlled variable
Final control element
A device or component that measures the variable to be controlled
Main sensor
A device that converts one energy form to another
Transducer
A device that receives a signal from one source then sends a corresponding signal to a receiver
Transformer
There are two types of sensors most commonly used
Analog and digital
Temperature sensors are classified into three groups:
RTDs, thermistors, thermocouples
An electronic pressure sensor is usually a transmitter that converts pressure into a variable such as…
Voltage, current or resistance
An example of an output device is an?
Actuator
What changes the value of a controlled variable?
Proportional controller
The input circuits for many electronic controller can accept a voltage range of?
1-10 volts DC
In an electronic control system what are analog sensors used for?
Continuously changing conditions
A final control element is positioned by a controller output signal which first goes to?
An output device
Resistance temperature devices can provide a relatively linear resistance from?
-40-120 degrees Celsius
