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Pressure Transmitter Explained | Working Principle
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In this video, we’re going to introduce you to a very versatile instrument used in industry today - the Pressure Transmitter.
First of all, let’s discuss the terms Transducer and Transmitter. Some people will tell you that a Transducer and a Transmitter are the same things and therefore the terms are interchangeable.
If you are curious, conduct a web search of the two terms and you will be surprised at the wide range of results!
A transducer is a device that converts one form of energy to another.
For example, an electrical transducer converts a sensed physical variable like temperature into an analog electrical signal.
A transmitter is a device that converts the electrical signal from the transducer into a much larger electrical signal that can be sent over a long distance to a PLC or a DCS.
The transmitter output signal is usually a range of voltage (1 to 5 V) or current (4 to 20 mA) which represents the 0 to 100% of the sensed physical variable.
A Pressure Transmitter is an instrument connected to a Pressure Transducer.
The output of a Pressure Transmitter is an analog electrical voltage or a current signal representing 0 to 100% of the pressure range sensed by the transducer.
Pressure transmitters can measure absolute, gauge, or differential pressures.
Absolute pressure is referenced to a perfect vacuum which is considered 0 psi! We express vacuum pressure as 0 psi (a).
Atmospheric pressure is usually about 14.7 psi (a).
The most common pressure measurement is gauge pressure which is the total pressure minus the atmospheric pressure.
Atmospheric pressure is 0 psi (g).
Let’s have a look at an example of a Pressure Transmitter measuring process pressure of gasses in a pipeline.
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