HPD Hazard Protection Device

The HPD is a level controller which works with sensors fitted to the Polaris heater. The sensor are Braude filaments which will not corrode in even the most corrosive of solutions.

The controller operated by passing a small ac current through the sensors which will detect the presence of a liquid. If there is no liquid present the controller will deault to the off position and the heater will be turned off thus ensuring safety of the heater and the tank.

HPD is best ordered at the time of ordering the heater ensuring the sensors are correctly positioned. It is possible to retrofit sensors where there is no other choice.

Example of Applications

  • Low level protection for all Popular and Modular heaters



  • Integral to Polaris Popular heater
  • Prevents heater failure
  • Tamperproof controller
  • Non corrodable filament sensor
  • Can be retrofitted to heater
  • Prevent catastrophic plant failures
  • HPD Technical data


    Surface mounted to IP65


    Controller 125mm x 125mm x 75mm


    Probe connection via Braude 2 pin plug.
    Mains 240V flying lead 1m standard

    Output Mains 240V flying lead 1m standard.

    Volt free option available


    Braude filament probe fitted to heater.

    Retrofit kit available

Product examples