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Waterline Controls

Water Level Controls & Sensors

SWS4500 – Fill with Low Alarm

SWS4500 – Fill with Low Alarm

Complete Kit Includes:

  • Sensor With 50 ft. Sensor Wire*
  • Controller


  • Fill w/ Low Alarm
  • 2-Contact point system
  • 6-wire Dry contacts to BMS for measuring:
    • Fill “ON” time
    • Low Water Alarm
    • Fault conditions
  • Operates any 110VAC valve & 110VAC audible alarm (Not supplied in this kit).


This is a fill with a low alarm. The fill circuit can open a valve or turn on a well pump to activate a water source to keep the pool filled. With the SWS4500 the low alarm can be used as an alarm, or it can be wired in series to turn a pump off, so it does not operate without water in the impeller. When a pump runs dry it can overheat the motor and melt the seals allowing water to pass and possibly short out the motor.


The system monitors for a low water level condition and has 3 outputs which will:

  1. Close a set of dry contacts for a BMS
  2. Operate a relay rated at 30AMPS for 250VAC
  3. Turn on an LED to indicate this sensor has tripped.

The SWS4500 has visual displays indicating power to the level control panel, when the control panel is actively filling and the low water alarms. The Fill dry contacts can be used as a comparative to develop a baseline benchmark of water usage for the system.

*Custom Sensors lengths available upon request.

If you are a Reseller, Sales Organization, Distributor, Contractor or an OEM we want to talk with you to determine an SPA price program for your organization so please call us at 1(888) 905-1892 or contact us now.