Hit Enter to Search


Digital, battery-powered water level sensor

Inquire now


  • High accuracy adjustable water level measurement, maintenance free

  • Up to 40 times overload resistance, pressure blow resistive

  • Integrated temperature measurement, optional

  • Integrated battery for minimum 2 million measurements resp. 10 years operation at a measuring interval of 3 minutes

  • Measuring rates from 1x per second to 1x per 100 days

  • Data memory up to 128kB for up to 216 000 measurement values

  • Interface head up to 3m water column flood protected

  • Installation in water level tubes of 1 ¼", at wider water level tubes, e.g. 2", a control plumbing by cable light plumbline is possible without deinstalling the sensor

  • Data extraction per laptop and handheld device or data remote transmission per GSM-module

  • Separated version with disconnectable connection housing available

Application description

The water level senor with data memory Hydrolog® 1000 is a battery powered system for autonomous measurement of water level and temperatures in liquid media. The preferential application fields are water supply and distribution e.g. for measurement tubes, control water levels, wells, containers and outstanding waters like lakes and rivers. Artesian measurements are also possible.

The excellent characteristics like highest strength against pressure and pressure blows, high resistance against chemicals and corrosion, very good insensitiveness against temperature shocks and EM interference, highest accuracy and long term stability and also low influence of temperature makes it possible to use the sensor also in various fields with liquid media like water, waste water, solvents, oil, sludge, grease, cleaning agents, etc. where water levels and media temperatures with date and time should be supervise without having any auxiliary power at the place of installation.

For applications, where food or drink water suitability is necessary, a corresponding variant can be ordered where only suitable materials are used.

Because of many possibilities of adjustment a highest flexibility in the application for control water level and especially for pumping test or long term supervise is given.

Function description

The liquid contacts directly the ceramic membrane and causes there a deflection of the membrane because of the hydrostatic pressure of the liquid.

At the maximum deflection the membrane contacts a robust ceramic carrier and because of this, the membrane come through over pressure of e.g. 40-times of nominal load at a sensor with a pressure range of 0...1 m water column without damage.

The water level proportional hydrostatic pressure signal of the ceramic membrane and also the temperature proportional signal of an optional integrated temperature sensor is measured by the integrated high-resolution digital electronic according to the adjusted measurement rate and is stored loss protected.

Because of an intelligent store management the internal data memory with a size of 64kB resp. 128kB allows a  recording of minimum 21 600 up to maximum 216 000 measurement data sets at exclusive storage of the measurement signal water level.

If water level as well as temperature are recorded, minimum 16 200 up to maximum 162 000 measurement data sets could be stored.

A highly efficient lithium battery that is integrated in the probe ensures the power supply of the device.

The battery life time is conceived for minimum 2.000.000 measurements. This equals a run time of minimum 10 years at a measurement rate of 1x per 3 minutes.

Integrated over voltage protection modules prevents the destruction of the water level sensor caused by atmospheric influences like e.g. thunder strike

Technichal data

power supply
power supply: integrated lithium battery, changeable
battery life: ≥ 2.000.000 measurement resp. 
  ≥ 10 years with a measuring interval of 1x per 3 minutes


level range: 1 m water column up to 100 m water column
units: mWs / cmWs / bar / mbar / mNN / mlowering
Deviation: ≤ 0,1% bzw. 0,25% FS 
Measuring range temperature: -25°C ... +70°C
accuracy: ≤ 0,3 Kelvin

data storage
memory capacity:  
   128 kB: 21.600 ... 216.000 records (water level)
                 16.200 ... 162.000 records (water level / temperature)
measurement range: one measurement per 1 second to one measurement per 100 days

membrane:  ceramic AL2O3   96% (medium contact)
probe:  steel1.4404 (AISI 316L) / 1.4571 (AISI 316Ti) (medium contact)
read-out unit:  CrNi-Steel
Extension cable:  PE Polyethylen (medium contact)
seals: FPM – Fluorelastomer (Viton®), EPDM – Etylen-ethylene- propylene - diene monomer (medium contact) 
environmental conditions
ambient temperature: – 25°C...+70°C, ice-free
medium temperatures: – 25°C...+70°C, ice-free
measurement range: 0...1 mWs up to 0...100 mWs