Truflo Delta-P Series is industry’s first all-plastic corrosion resistant differential pressure gauge and relay switch. The DPG measures the differential pressure between the upstream port or (High) and downstream port (Low) to provide indication and notification of a filter/strainer element (change, clean or replace), pump (choked flow), valve (cavitation) or tank (level). The pressure difference in turn acts on a piston/magnet assembly within the Truflo device activating the programmable latching relay switch which can be used for Alarm Notification, Pump or Valve Shut-Off.

  • Perfect for Basket Strainer / Bag Filter Notification
  • Excellent Chemical Resistance
  • Relay Output


  • All Plastic Design / Glass Filled Ryton
  • Corrosion Resistant
  • NEMA 4X Rugged Enclosure
  • Liquid Crystal Display
  • Pressure Range / 0-225 psi
  • Easy to Program Relay Set-Point
  • psi or bar Pressure Scale
  • Small Footprint / 2″ Diameter
  • Easy to Install
  • EPROM Memory / Retains Set-Point / Criteria
  • Low Power Detection Feature
  • Actual Pressure Difference Displayed on Screen
  • Manual Override Function
  • Programmable Time Intervals / Relay Activation


Dry Relay Contact                        0.5 AMP at 24VDC (N/O) Output
Body Diameter                             2″
Operating Temperature           -20 – 60°C / 4-140°F
Supply Power                              24VDC
Accuracy                                       ± 0.5%
Maximum Inlet Pressure          225 psi / 5 bar
Enclosure                                     NEMA 4X / Ryton PPS