What is a Pressure Transmitter?

Pressure transmitters are devices, designed for pressure measurement in gases, liquids, air, or oil. Pressure transmitters are widely used in various industrial processes, such as filtration plants, chemical feeds, wastewater industries, food industries, pumping stations, and more. Because of their common demand, pressure transmitters are often very customizable by pressure range, accuracy, connection type, output, IP class, and even more variables.

With so many applications, in order to chose the right pressure transmitter, we have to look into what types of pressure transmitter are there, what do pressure transmitters do and how do pressure transmitters work? Keep reading to find the answers bellow.

Pressure Transmitter Function

As BMengineering.co.uk puts it, pressure transmitters measure pressure in various mediums (liquids, fluids, gases) and alert their users when a wide difference in range occurs. This is how pressure transmitters help prevent accidents in industrial processes. Although all pressure transmitters have pressure measurement function in common, the applications may differ a bit depending on different types of pressure transmitters.

The Main Types of Pressure Transmitters

• Standard pressure transmitters – they are compact, universal devices designed for almost all industrial applications and their purpose is measuring pressure range.
• Hydrostatic pressure transmitters – often called level transmitters because of their working principle and ability to measure level. Hydrostatic pressure transmitters work on the basis that the amount of pressure increases with depth. These devices are submersible and can be used for liquids and gases.
• Absolute pressure transmitters – used in cases when the pressure of gases or liquid is isolated from changes in atmospheric pressure. These pressure transmitters would be used when pressure that is being measured is not affected by any changes (such as temperature).
• Differential pressure transmitters – have two sensory diaphragms and can measure the difference between two pressures. Differential pressure transmitters will then produce an output signal with reference to a calibrated pressure range. These devices are very commonly used in monitoring various industrial processes.

Pressure Transmitter Working Principle

To put it simply, pressure transmitters convert the mechanical pressure into analog electrical signal. Pressure measurement is based on capturing the changes in voltage. The pressure on the pressure transmitter acts as a force on the diaphragm – depending on the applied pressure the diaphragm either expands or compresses, and the resistance value changes accordingly. The value is then transmitted as an electrical signal. When a certain change of pressure occurs, pressure transmitters can be used to notify its users that something needs attention.

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