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Waterline Controls

Water Level Controls & Sensors

Fire Protection Water Tank Level Controls

Fire Protection
Water Tank Level Controls

When Reliability Counts

(Products listed for this category are below)

Well Water Holding TanksWe make custom Fire Protection System controls as needed to meet codes for local municipalities. We have worked directly with Fire Marshals for the cities of Los Angeles and Seattle. The Waterline Controls FPT models for Building Fire Protection may look like the competition but the unit is revolutionary in its design. The FPT models are perfect for any application where water level management is important. Its use of a microprocessor monitors all its probes for correct operation and then provides outputs to drive power relays, close dry contacts for remote fire panel, and provide a visual output of operational status of each function. Using a very low voltage and current prevents the sensor from fouling, plating, or degrading.

All of Waterline Controls FPT models easily integrate with existing remote fire panels allowing the building operator to easily monitor the fire water storage tank.  The FPT systems automatically fill water when needed with the exception of the FPT-40 alarm only model.  Every unit we offer comes with a 5 Year Limited Warranty.

FPT Model Features

  • Sensor does not foul, plate or degrade
  • Up t0 10 dry contacts for remote fire panel monitoring (.5A @ 60VAC/VDC)
  • Audible alarm w/ silence switch
  • 1 to 4 power relays (40A @ 120VAC)
  • Optional temperature signal @ 40°F per NFPA
  • LED function indication 
  • Press to test
  • Easy Installation
  • Low to no maintenance
  • 15 year avg. lifecycle
  • Optional Paragon Valve – Operates via FPT system control and also during power-loss


Control Panel:  8-3/4” X 10-1/2” X 6” including the hinge and the latch.

  • NEMA 4x (indoor/outdoor)
  • 8-3/4” X 10-1/2” X 6” (incl. hinge and latch)

Sensor & Sensor Mounting Assembly:

  • Intrinsically safe sensor
  • 3″ dia. x 20″ long


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Really Like It

Thanks for checking on our latest purchase. We actually just installed this last week and it works perfectly! Nice piece. Really like it. They need to run Power to the heater yet, but I dry ran everything and it all worked flawlessly!
All of the customers that I have installed your product on have no complaints and there problems went away.
Thank you very much and I will be continuing to push your product.

Category Products
WLI Water level indicator


Level Indicator used to show the level of water

FPT50 Controller


  • Redundant Design for Safety
  • 10-wire Dry contacts to BMS with Redundant Systems for measuring:
    • Fill Level 1
    • Fill Level 2
    • Low Water Alarm
    • High Water Alarm
    • Fault conditions
WLC 4500 Series(Under Construction) FPT50 – Fire Service Water Tank Level Control with High & Low Alarm / Power-loss Fill Capability & Paragon Valve Included  Complete Kit Includes: Paragon Valve (4″, 6″, or 8″) w/ power-loss fill capability NEMA 4x Control Panel Sensor w/ 50 ft. cable Sensor Mounting Assembly Submittal Package PDFs Controller Submittal Functional Illustration [...]
FPT50 Controller

Complete Kit Includes:

  • Dry contacts to BMS for measuring Fill "ON" time
  • Low Water Alarm
  • High Water Alarm
  • Fault conditions
  • Operates 110VAC Solenoid Valve
  • Two 110VAC 95db Audible Alarm w/ Silencer Switches Installed in the Panel
FPT50 Controller(Under Construction) FPT40 – Fire Service Water Level Control Complete Kit Includes: NEMA4x Control Panel Sensor With 50 ft. cable Sensor Mounting Assembly Submittal Package PDFs Controller Submittal Sensor Submittal Flow Diagram Warranty Flow Diagram (click image to enlarge) (right click image to download) Download Manual Download DWG Features Dry contacts to BMS for measuring [...]