Conductive Sensor

Conductive Level Sensor

The Hydreka resistive detector ('Overflow detector') allows the detection of a fixed level threshold in a conductive liquid.

Very easy to install by fixed mounting on any surface, it can be used in pipes, on a floor, a wall, a threshold or even in tanks and reservoirs.

It includes an electronic box that supplies power and corrosion protection to the two measuring electrodes that detect the presence of liquid; this box generates the output signal.

The sensor has no moving parts and is therefore particularly robust and can replace sensors such as level floats in many applications.

It can be used with data loggers for a simple need of alert (flooding, overflow...) or can be connected to any control system as a level detector.


Can be used in any conductive liquid medium compatible with the sensor materials.

Pay particular attention to the installation of the sensor when the risk of fouling is significant.

Application examples:

  • Flood detection in a building or in a water system chamber
  • Detection of overflow in a rain or sanitary network
  • Detection of the presence of water in a basin or canal
  • Level monitoring in a tank or reservoir to control equipment (pumps etc.)
  • Trigger sensor for a sampler

Main benefits

  • Highly robust
  • No moving parts, unlike traditional ball sensors and microswitches
  • Easy to install (2 fixing screws)
  • Tongue between the 2 electrodes to avoid contact of floating objects
  • Anti-corrosion protection
  • Possibility of double signal output (status detection and equipment control)


  • Sensor dimensions (L x W x H): 82 x 60 x 20 mm
  • Power supply box dimensions (L x W x H): 80 x 60 x 40 mm
  • Weight: 900 g (with 10 m cable)
  • IP68 tightness level (sensor and electronic box)
  • Materials:
    — sensor: resin-coated nylon
    — electrodes: Stainless steel
    — resin-coated electronic box
    — cable: polyurethane
  • Cable available in several lengths (standard: 10 m)
  • Cable supplied with bare wires or equipped with a waterproof connector for connection to systems such as our data loggers (Intelligens, Multilog, etc.)
  • Output signal: dry contact
  • Signal reading power supply (depending on application):
    — by the data logger (standalone solutions)
    — by external source (max. 24 VDC, 50 mA)
  • Battery life of the internal Lithium battery of the electronic box: 7 years

Related products

  • Connection accessories (IP68 waterproof connectors)
  • Data loggers, PLCs, telemetry units


Conductive Level Sensor - electronic box
Overflow Detector
Overflow Detector
Overflow Detector
NextPressure Sensors