Pressure transmitter

Precision in industrial processes

A pressure transmitter (also called a pressure sensor) measures and transmits pressure values in industrial processes. Unlike a pressure gauge, a pressure transmitter does not display the measured pressure locally. Instead, it sends the data as an electrical signal to a control system. Therefore, pressure transmitters are essential in installations that require continuous monitoring and process control.

On this page, EMVO Techniek explains what a pressure transmitter is, how it works, and in which applications pressure transmitters are used.

What is a pressure transmitter?

A pressure transmitter, also called a pressure sensor, converts pressure into an electrical signal. The device then sends this signal to a PLC, monitoring, or control system. As a result, pressure transmitters are widely used in industrial environments where reliable and continuous pressure measurements are essential. Moreover, they enable automation and process monitoring.

How does a pressure transmitter work?

You mechanically connect a pressure transmitter to the process where the pressure is measured. On the other side, you connect the transmitter electrically, usually via a 4–20 mA signal.

In short, the operation works as follows:

1. An internal sensor measures the pressure.
2. The sensor converts the pressure into an electrical signal.
3. The signal sends a 4–20 mA current loop to the system.
4. The control system reads the measured value.

Thanks to this principle, pressure transmitters are ideal for industrial automation and process monitoring.

Pressure transmitter vs. pressure gauge

A pressure gauge displays the pressure locally, while a pressure transmitter sends the measured value to an external system. Therefore, in automated industries, pressure transmitters are often the standard solution. Additionally, these instruments are widely used in sectors where continuous measurements are critical, such as the chemical and energy industries.

Applications of pressure transmitters

Pressure transmitters are used in:

• Chemical industry
• Energy and power supply
• Process installations
• Industrial automation
• Technical installations

In these sectors, pressure transmitters often form an integral part of the process design. Moreover, they provide reliable and continuous measurement values.

Connections and installation

Pressure transmitters are usually mounted via a threaded connection. Common connections include:

• BSP threads (standard in stock)
• NPT threads
• Other connections on request

Although not all connections are standard, alternative versions are often possible through consultation. Thus, you can always select a transmitter that suits your installation.

Signal and communication (4–20 mA)

The 4–20 mA signal serves as a widely used industrial protocol for pressure transmitters. It allows reliable transmission of pressure values over long distances without loss of accuracy. Furthermore, depending on the industry, this protocol can serve as a standard within installations and systems.

Materials and construction

Modern pressure transmitters feature a 316 stainless steel sensor and a stainless steel housing. This construction provides important advantages:

• High resistance to corrosion
• Suitable for liquids and aggressive media
• Long service life

Compared to older generations, this design offers a more robust and reliable solution. As a result, the transmitter lasts longer and performs more reliably under harsh conditions.

ATEX and explosion-proof pressure transmitters

For explosive environments, EMVO Techniek provides pressure transmitters with ATEX certification. This ensures that the transmitter is explosion-proof and does not generate sparks, even under extreme conditions.

ATEX pressure transmitters are especially important in environments with flammable or sensitive materials. Because not all pressure transmitters are standard ATEX-certified, this requires consultation with the manufacturer and additional certification.

Pressure gauge calibration

You can calibrate your pressure gauge quickly, including an official calibration certificate. Send your gauge today, and receive it back within 1–2 working days. Contact us for more information.