Transducers are devices that convert energy from one form to another. They contain two main parts: a sensing element that detects a physical change, and a transduction element that converts the sensor's output into an electrical signal. Selection of a transducer depends on the physical quantity to be measured, the transducer principle best suited for the input, and the required accuracy. Transmitters take readings from primary sensors or transducers and convert them into standard signals that can be transmitted over longer distances to monitors or controllers. They work by producing a potential difference when AC current flows through a wire, causing the wire to radiate electromagnetic waves. Common types of transmitters include pressure, temperature, flow, and level transmitters. The

1. Transducers &
Transmitters
By Mahnoor Butt
M12-CE16

2. Transducers
Transducers are electric or electronic
devices that transform energy from one
form to another.
For Example: microphones, loudspeakers,
thermometers, position and pressure
sensors, and antenna.

3. Working Principle

4. Transducer Elements
Sensing element
Transduction
element
Transducer contains two parts that are closely
related to each other i.e. the sensing element
and transduction element.

5. Sensing element
The sensing element is called as the
sensor. It is device producing measurable
response to change in physical conditions.
A microphone converts sound waves that
strike its diaphragm into an electrical
signal that can be transmitted over wires.

6. The transduction element convert the
sensor output to suitable electrical form.
Transduction element

7. It is a device that converts an electrical
quantity into a non electrical physical
quantity. It is a precision actuator having
an electrical input and a non electrical
output.
Amplifier
LoudspeakerMicrophone
Input
Device
Controller Output
Device
Inverse Transducers

8. Selection of Transducer
Selection depends on:
• The physical quantity to be measured.
• The best transducer principle for the given
physical input.
• The order of accuracy to be obtained.

10. Transmitter
A device which converts the reading from
a primary sensor or transducer into a
standard signal and transmits that signal
to a monitor or controller to a longer
distance.

11. Working Principle
When we provide the ac current to any
simple wire, it produces the potential
difference at both ends of wire and so the
current starts flowing into it. But when the
wire is no longer able to hold the current,
it starts radiating the energy outwards in
form of radio waves , and these waves are
also called the electromagnetic waves.

12. Types of Transmitters
• Pressure transmitters
• Temperature transmitters
• Flow transmitters
• Level transmitters

13. Difference
Transducer
• Voltage-output device
• more sensitive to
electromagnetic
interference
• For short electrical
connection range
Transmitter
• current-output device
• less susceptible to
electromagnetic
interference
• For larger distances

14. Thank
you…