76 A with NB 220



Thermal overfill prevention device, fulfilling the requirements of the German Water Resources Act (WHG)

Easy to use and reliable

The ideal solution to overfill prevention of tanks for water polluting liquids. With its easy installation and the option of acoustic or optical sensors, the overfill prevention has proven its reliability for years.

Level Detector 76

The Level Detector 76 from FAFNIR can be used in any container (outside the Ex-zone) where you require an overfill prevention or a limit switch. Whether it is a tank with a volume of several thousand litres or a containers with a smaller volume, we have the appropriate overfill prevention device.

76 A

Our standard device for all applications, easy to install with a reverse polarity protected cable

76 C

With a permanently installed cable, for applications where there is no space for the enclosure, or for OEM applications with a pre-configured cable.

76 N

All parts exposed to liquid are manufactured from stainless steel 316L. The enclosure is nickel plated; this means the sensor is suitable, for example, for AdBlue.

Transducer NB 220

Installing this stand-alone device is very easy. We have the right solution for you, whether as a simple relay output for the connection of PLC (NB220 H), as a stand-alone solution with an additional integrated optical and acoustical alarm (NB 220 QS and NB 220 QSF), or even with switched 230 V to directly connect an electrical consumer i.e. a pump (NB 220 QS).

NB 220 H

This transducer is suitable for installation in a control cabinet. With its potential-free changeover contact it is ideal for connecting to a PLC-system.

  • Power consumption: max. 6 watts
  • Ambient temperature: -25 °C to +60 °C
  • Protection class: IP40

NB 220 QSF

An acknowledgement unit as well as a visual and acoustic alarm is fully integrated to the device. An external alarm signaling device can even be connected to a 230V output relay.

  • Power consumption: max. 5 watts
  • Ambient temperature: -25 °C to +50 °C
  • Protection class: IP40


Equipment Type Overfill Prevention, Thermal Level Detector
Liquid Fuel, Wastewater, Water
Vessel Bulk Tank, Intermediate Bulk Container (IBC), Road Tanker, Ship, Underground Storage Tank
Measuring range 100.00 mm up to 3 000.00 mm
Stem diameter 16.00
Process Connection Fitting, Flange
Temperature -25.00 °C up to 80.00 °C
Pressure 0.00 bar up to 2.00 bar
Certification None, WHG
Signal output Relay
Power Supply 115 VAC, 230 VAC, 24 VAC, 24 VDC
Additional criteria Dry run protection