Differential Pressure Plus designs and manufacturers differential pressure gauges and filter indicators. Our main industries are cyrogenic storage for liquid oxygenm nitrogen, and natural gas. Filtration of water, oil, and other gases and liquids. Leak detection systems for large tanks and pipelines. Flow rates on venturis and other flow type devices. We are located in the United States and have been manufacturing since 1991. We also make a like of 4-20mA transmitters and entire line of testing equipment. Our backflow test kits are used to test back flow preventers around the world

Who is Differential Pressure Plus?

Differential Pressure Plus Inc. has been designing and manufacturing differential pressure gauges  and status indicators in Branford, CT, since 1991. The vast majority of applications involve water and fuel filtration, however our differential pressure gauges can also be used to measure liquid levels in cryogenic tanks, can monitor flow rates, applied to balancing valves, and can monitor pump life. Differential pressure is one of the most adaptable, yet underused tools in the industry and we want to change that.


We manufacture differential pressure gauges for filter, cryogenic storage, pump, and flow control device manufactures.


Our highly customizable line of differential pressure gauges and filter indicators allow us to develop solutions for nearly any differential pressure application.


Helping manufacturers around the world develop new and innovative solutions to improve their product and process systems through the implementation of differential pressure measurement.


Our staff is a blend of young innovative minds and experienced engineers that are constantly looking to the future.

Featured in “Practical Engineering”

Check out our new filterSHIELD series gauge in “Practical Engineering’s” recent video about cavitation!


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Differential Pressure Plus business with the development of our modular filter indicator line. Since then, we have expanded to precision differential gauges, kits/lab equipment, and even new electronic differential devices.

Differential Pressure Gauge And Filter Indicator


We manufacture 3 main differential filter indicator lines that have been designed to either mount directly onto a filter head or be piped to remotely. Their interchangeable parts allow for different ranges, electrical options, and more.


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For applications such as advanced filtration, cryogenic level measurement, venturi based flow measurement, and much more, our precision differential pressure gauges have been trusted by thousands of manufacturers.


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From backflow testings, to portable venturi monitoring kits, and even leak detection products, these specially designed pieces of differential pressure equipment have been engineered to be the best in the industry.


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Differential Pressure Gauge Applications

          Differential pressure gauges are probably some of the most underutilized and misunderstood products in manufacturing. As a result of a near complete lack of mention from engineering eduction, we see engineers constantly using two standard pressure gauges, when they could just use one differential pressure gauge. From applications involving filtration system, measuring flow rates using the Bernoulli Principle, displaying liquid levels in cryogenic tanks, detecting leaks in systems, and so much more, these capable instruments should be part of every engineer’s toolbox. Because of this, we have put this page together to overview some of the applications of these gauges. Most of all, we hope this provides you with a good starting point when designing your systems.

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What is a Differential Pressure Gauge

    Simply put, a differential pressure gauge measures the difference in pressure between two connections. As a result, let’s imagine an application where you have a tank at 100 psi and another at 95 psi. If you connect a differential pressure gauge between those two tanks, you will read 5 psi.

There are a few different gauge designs to achieve this, but Differential Pressure Plus manufacturers a design known as a “Magnetic Coupling.” Each gauge has a magnetic piston that moves back and forth like a sea-saw depending on the differential pressure. As a result, the linear movement of this magnetic piston pushes and pulls on a rotary magnet that connects to the pointer. This “magnetic rack and pinion” provide the readout.

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Monitoring Filters

        As filter cartridges get clogged, the differential pressure between the inlet and outlet increases due to the buildup of contaminants in the filter mesh. Because of this, operators can measure a differential pressure drop across a filter and can get a visual indication about how dirty their filter systems are. As a result, using a differential pressure gauges for a filter application can:

  • Help operators prevent damage to their system because they stay informed of filter status.
  • Prevent legal issues between filter manufacturers and customers who over exert the life of their filters and misuse the systems
  • Increase filter cartridge sales by 20-30% by helping customers stay informed of the filter’s status
  • Help distinguish your filter from the 1,000’s of competitors out there

Need A Quote?

We would love to help you develop a solution for your application. After supplying us with your requirements, we will have an engineer contact you directly and give you advise and develop pricing in one step


More Updates

Check out our YouTube account and other social media outlets to see pressure product updates and learn more about our creative team.