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Hydrostatic Level / Pressure / NIVOPRESS N®


The NIVOPRESS N hydrostatic borehole level transmitters are designed to measure the
level of clean or contaminated liquids. The pressure sensor at the bottom of the probe
measures the hydrostatic pressure (Phydr) of the liquid column above it and compares with
the atmospheric pressure (Patm). The atmospheric pressure is led to the sensor through a
breathing capillary which is equipped with a moisture filter that prevents the moisture
reaching the electronics and decreasing the accuracy of the measurement. This enables the
atmospheric pressure to be subtracted from the measured pressure to get the hydrostatic
pressure which is proportional to the height of the liquid column (h). The electronics converts
the sensor’s signal into an output signal. If temperature measurement (of the liquid) is needed
beside the level measurement a combined (level + temperature) transmitter should be used.
The installation and wiring of the transmitter is helped by the wide variety of accessories.
A sewage adapter working on the principle of the diving bell can be snapped (NP) or can
be screwed (NZ) into the place of the protecting cap to avoid the direct contact between
the sensor and the measured contaminated liquid. An extra mechanical protection is built
in the NZ type sewage adapters in the form of a mechanical filter. The N-500 types can
be used in hazardous environments. The NZ screw-in type transmitters are recommended
for applications where there is a risk of flooding. The NB / NG plastic housing types are
designed for those applications where the aggressive medium (e.g. saline solutions or
seawater) could cause galvanic corrosion of the stainless steel body


  • 2- or 3-wire submersible transmitter
  • Capacitive ceramic, piezoresistive stainless steel and piezoresistive ceramic sensor
  • Stainless steel or fully plastic body
  • Venting tube in cable
  • Reverse polarity protection
  • Optional lightning protection
  • Linearity error: ±0.25%
  • Integrated Pt100 temperature sensor
  • Explosion-proof variants available
  • Borehole transmitter for the water industry


  • Level metering of small diameter pipes, sewage water, saline solutions, sea water, potable water
  • Chemical industry
  • Water / wastewater industry
Power supply:12–30 VDC
Process temperature:−30°C…+60°C
Measuring range:0–200 m
Output:4…20 mA + HART®, 0–10 V
Ingress protection:IP68