What are the Differences between Transmitter and Transducer?

Both transducers & transmitters are meant to convert energy from one form to another, giving an output signal. But you must be wondering about what’s the difference then!

Whether you use the transducers or transmitter, the signal is directed to any device that interprets it & further uses it to display alter or record the pressure. To many, it’s still really difficult to decide whether they should be using a transducer or transmitter for your application? Virtually, Transducers & transmitters are the same things. The only difference between these two is the kind of electrical signal each sends.

Transmitter and Transducer

When we talk about a transducer, it sends a signal in volts (V) or millivolt (mV) whereas the transmitters send signals in milliamps (mA). In case the electrical connections in the process are short just like in a laboratory or inside an electronics enclosure, a pressure transducer is preferable as they tend to be smaller and there’re also very few active electronic components that could be upset by electromagnetic interference. Here’s the difference between transducers & transmitters that you must know. So let’s dive in;


Primarily, the transmitter is a current output device having 2-3 wires. These wires are beings used as transmitting & O/P signals as well as to receive power; wherein long cables are also required. Typically, a 2-wire transmitter is used with 4-20mA output. Nowadays, the 3-wire transmitter has also been developed in order to have an output of 0-20mA signal.

The transmitter – TX for short, is purposed to communicate the electronic signal over a distance. These are mainly the video signals from a video camera, audio signals from a MIC, etc. The Pressure Transmitters is meant to combines the information signal carrying with the RF signal and generating the radio waves – A.K.A Carrier. It’s the entire process that’s known as modulation. There are many different ways to add information to the carrier signal. The two major types of transmitters are AM transmitter & FM transmitter.


The transducer is a device that is supposed to convert a physical signal into a different one that can be understood by the system. The variation of resistance obtained in the sensor is a direct value of temperature, but in the control systems, they don’t work with these signals but with voltage or intensity. So with the help of a transducer, this variation of resistance is associated with a variation of voltage that’s also proportional to the temperature. The transducer reads a variation of resistance in sensor and associated with a voltage variation. The transducer, therefore, usually includes the sensor.

Transmitter and Transducer

Basically, the sensor is a transducer incorporated in a feedback control loop, and its function is to collect/capture a type of information in the system to give feedback.

Another significant part of a transducer is the amplifier; the voltage variation that is recorded as a consequence of the temperature variation is too small to be digitized. Perhaps that’s the reason why it’s imperative to amplify it. The optimal values of amplification are related to the available digitizer, the reading range of the digitizer should be taken into account; otherwise, the data will be lost if we expand the voltage above this range. Precisely, a transducer is suitable for OEM type applications, in machinery adapted to the signaling configured from the factory.