Table of Contents
Table of Contents
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.).
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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 |
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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
Contributors:
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