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Table of Contents

Table of Contents


Pressure Transmitters

Image of various pressure transmitters.


What are Pressure Transmitters?

A pressure transmitter is an instrument that outputs an electrical signal based on a pressure measurement of a fluid (liquid or gas). Pressure transmitters are often used to monitor pressure of equipment in the process industry (tanks, pipelines, etc.).



Components of a Pressure Transmitter

There are two components of a pressure transmitter. The transducer, measures or senses the pressure, and converts the physical variable to an electrical signal. The transmitter magnifies and relays the signal for long distances to a PLC. The signal is representative of the pressure range from the transducer.



Pressure Transmitter Sending Electrical Signals

Animation of a Pressure Transmitter (Transducer) sending electrical signals to a PLC.Image Modified


Pressure Measurement

Transmitters can measure pressure in three different ways:

  • Gauge Pressure - pressure is compared relative to local atmospheric pressure
  • Absolute Pressure - pressure is compared relative to absolute (zero) pressure
  • Differential Pressure - the difference of pressure between two points



Advantages

  • Measure pressure levels and pressure differences
  • Made of piezoelectric materials
  • Some pressure transmitters are self-calibrating


Disadvantages

  • Expensive

Suppliers


References



Contributors:

Contributors Summary
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Faculty Advisors: Rachel Malevich (alumni), Mary Robinson