A. Magnetic pickup sensor.
B. Control valve
C. RTD
D. LVDT
The correct answer is B.
Control valve.
Here’s why::-
Analog Input Signals
Analog input signals are continuous signals that represent physical parameters such as temperature, pressure, flow rate, or position.
Examples of analog input signals include:–
*Temperature measurements from thermocouples or RTDs (ResistanceTemperature Detectors)
*Pressure measurements from pressure transmitters
* Flow rate measurements from flow meters
*Position measurements from LVDTs (Linear Variable Differential Transformers) or potentiometers Instrument Types
Now, let’s examine the options:-
A. Magnetic pickup sensor: This sensor measures speed, direction, or position and produces an analog signal. It’s an analog input signal.
B. Control valve: A control valve is an actuator that regulates fluid flow, pressure, or temperature. It’s typically controlled by an analog output signal from a controller, but it’s not considered an analog input signal itself.
C. RTD (Resistance Temperature Detector): An RTD measures temperature and produces an analog signal. It’s an analog input signal.
D. LVDT (Linear Variable Differential Transformer): An LVDT measures position or displacement and produces an analog signal. It’s an analog input signal.