Pressure Transmitters

A pressure transducer (aka a pressure transmitter) is a device that converts pressure into an electrical signal. The main usage for pressure transducers is to measure the pressure of a fluid, hence a common application for them would be in pumps or wells. At APG, our pressure transducers also are unique in using piezoresistive technology to assure accurate measurements. Let one of our product experts help you find the right solution for your application.

Our pressure transducers use piezoresistive technology to accurately measure pressure. This is based off of a small circuit called a Wheatstone bridge attached to the back of a diaphragm. As the diaphragm flexes from pressure, the resistance in the Wheatstone bridge (hereafter known as the “sensing element”) changes relative to pressure, providing a basis of measurement.

There are a few different methods of mounting the sensing element to the pressure transmitter diaphragm. Each has its own set of pros and cons. For example, some perform better in low pressure environments, others in high pressure. We’ll use the best method according to the configuration of your sensor.

Once the measurement is taken, the transmitter conditions the signal to the output you have chosen and sends it off to your control system.

While we only list a few pressure transducer families, each has a wide variety of configurable options when you purchase. These include options for:

- outputs
- pressure ranges
- electrical connections and pin outs
- and process fittings

Most allow you to adjust the zero and span in the field as well.

APG pressure transmitters are used throughout industry, in both process and storage environments. Our PT-L families are built for industrial applications in pressure ranges up to 10,000 psi, and are suitable for both liquids and gasses. They are designed to provide accurate measurements and a long life expectancy at a low cost.

Our PT-400 family is designed for extreme environments. In particular, our heavy duty pressure transducers are designed to handle:

- dirt & fine dust
- water spray & washdowns
- outdoors & inclement weather
- hazardous locations
- high vibration

Pressure transducers are most popular in the Oil & Gas industry where demanding conditions are further complicated by hazardous classified areas. In particular, our PT-400 pressure transducers are well suited for applications with extreme vibration - where other pressure transducers tend to fall apart.


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