Pressure transmitters are simple devices based on a simple principle. And you can use them to measure more than pressure, like level and flow. The article here talks about how they work.

You can install a pressure transmitter in all kinds of applications, but all of these take different installations. For example, say you want to measure a level with a differential pressure device. If you have an open tank, then you can install the device on the bottom of the tank using a flange with a filled-sealed container.

Pressure transmitter installation

If you want to measure flow with a pitot, then you can install the device using a single flange direct to the pitot. Or if you have a steam flow meter with an orifice plate, then you’ll want to install your transmitter remotely with a seal pot between the device and the process.

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DRTR-ED-10V for absolute pressure Compact pressure transmitter in stainless steel for liquid and gases with G1/4" connection
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With so many options, the easiest, cheapest, and most reliable installation will depend on your process. Of course, many of you knew I’d say that, but a few didn’t!

You can find many types of sensors on the market – capacitive, piezo-electric, resonant silicon, and more. The article tells you how it works using a capacitive sensor as an example. It’s the most common, although that doesn’t make it the best.

So pressure applied to capacitive cells will produce a change in the capacitance of the sensor. This change will affect the oscillator frequency, and the transmitter will detect this change. Then the transmitter translates this data into a standard output signal that we can read.

Using a local setup or a handheld, you can adjust the transmitter, changing information like the unit, measuring range, and output.

Level and flow measurement using a pressure transmitter

As said before, pressure transmitters can measure more than pressure. Using different primary elements, you can measure flow through the differential of pressure.

You can also use a pressure transmitter to calculate the level of closed and open tanks. For that, you can use a transmitter with differential, absolute, or gauge pressure.

To know more about such transmitters, you can read the Visaya Article on Absolute, gauge, and differential pressure!

Today we have other principles that work as well or better to measure flow or level. However, you’ll still find pressure devices installed across many segments, processes, and measurements.

To know more about how to install a pressure transmitter, you can check out this video or can get in touch with our engineers!


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