Floating Leakage (level) Measuring

Floating leakage (level) is mainly used for measuring the water level in channels for the collection of leaks in dams, in earth,concrete or RCC.   A float of suitable shape and size follows the variation in flow upstream of a weir; a LVDT extensometer is connected to the float and automatically measures its vertical movement, that is the variation of level. Level meters are available with ranges of 100mm, 200mm, 300mm; and other customizations on request.

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Level measurement in open channels is widely used and applied in environmental and geotechnical fields. In particular, the measure of the level of water in earth or concrete dams, is one of the most important indicators of the health status of the construction. Other typical applications for this instrument are level measurements in:

  • dams
  • spillways
  • tanks


Features and Benefits

High resolution and sensitivity
High speed measurement
Measurement in real time
Not sensitive to atmospheric disturbances
Easy to use
Long life of the system
Wide variety of measurement ranges
Possibility of automated measurements


Measuring principle

In a channel, a weir causes a variation in water level upstream which is directly proportional to the variation in flow rate. Level measurement can be performed with different systems; we offer the “float system”.

This is in particular of a linear extensometer sensor, associated with a float carrying on the top end of a bar, with this integral, which serves as the mobile element of the extensometer

In this case it is composed of a linear extensometer sensor linked to a float which serves as the mobile element of the extensometer?

Each movement of the float, which freely follows the water level, is transferred communicated to the sensor that detects the float

The system for the measurement of dam leakages, is composed of:

  • Weir of known overflow section (triangular, rectangular or other)
  • LVDT linear transducer (or other on request)
  • Float
  • Application and support device


Technical Features

Sensor LVDT , potentiometer, magnetostrictive
Range 100mm;200mm
No linearity O,25% f.s.
Working temperature -55 ÷ 150°C
Material AISI 304
Output signal 4-20mA (directly or using a converter signal)
Floating Stainless steel
Size Φ=100mm; h=80mm
Precision obtainable ( sensor / floating) ±1mm


Technical Assistance

If you have any requests or questions about our instruments or if you have special needs that require different solutions from the standard, please contact us. Our team will provide all the necessary information and will be very happy to work with you to study, develop and customize instruments and solutions suitable for your specific needs.


All information in our datasheet is subject to change without prior notice.

Please check the datasheet/details carefully and contact Pizzi Instruments for further information