LDG Differential Pressure Gauge (previously 400DGC) - Differential Pressure Plus
Differential Pressure Plus manufacturers differential pressure gauges for monitoring filter status, liquid level, flow rate measurement in venturis, and much more.
differential, pressure, gauge, filter, status, midwest instrument, orange research, wika, ashcroft, delta, manometer, venturi, liquid level, measurement, dpp, plus, 200DPG, DPP975, filtershield
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LDG Diaphragm Gauge (previously 400DGC)

Precise Low Differential Measurement.

            From liquid levels, flow rates, pressure balancing, and filtration, the LDG is an extremely versatile gauge. With a system pressure rating of up to 500 psi and pressure ranges as low as 1-25 inches of H2O, this gauge is extremely robust. The convoluted diaphragam in the LDG is improved from the 200DGR rolling style. This design allows the gauge to take complete reverse pressure and also gives the gauge finer pressure readings on the low end.

Sometimes you just don’t know…


  • Lowest Available Pressure Ranges (1-25 in H2O)
  • System Pressure Ratings up to 500 PSID
  • Can Have a “Zero-Center Dial”
  • Wide Spread Usage in HVAC and Flow Balancing
  • Panel Mountable Dials and Mounting Brackets
  • Color Bands, Liquid Fills, and Follower Pointers
  • Electrical Switches options
  • 150+ Pressure Ranges

400DGC CAD Files

For Further CAD files, please email us for quick response.

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

Our LDG…

is an industry leader for situations in which a very small differential pressure must be monitored, but the system pressure is high. The convoluted diaphragm adds safety from the risk of reverse pressures from back flushes on filter systems.  It can also be used on leak detection, HVAC, flow management, and many other low differential pressure applications.

The LDG can:

  • Be made into a portable kit
  • Be pre-outfitted with a manifold
  • Be machined from Aluminum, Brass, or Stainless Steel
  • Be fully customized with over a million design combinations

Application Examples

Zero Center Dials for Balancing
Custom Vertical Calibrations
Complex Flow Situations
Balancing Valves
Bag Housings
Directly into Filter Head


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