Nivus-LogoThe NIVUS group is a leading developer, manufacturer and supplier of measurement instruments for water industry. Since 1967 our company has been pointing the way ahead by setting new standards and by continuously developing high-quality

Our product portfolio comprises metering devices for flow, level, pressure, water quality, density and turbidity. NIVUS furthermore provides devices and software for detection, transfer, recording and evaluation of data. A high-performance telecontrol system with multiple functions particularly for water industry completes the product range

Fields of Activities:

Channel Networks Monitoring


Portable and permanent measurement systems for continuous measurement of flow and level in channel network systems

Wastewater Treatment Plants

image006Portable and permanent measurement systems for continuous measurement of flow and level in all areas of wastewater treatment plants

Flowing Waters Rivers & Channels

image008Flow measurements in flowing waters for flood protection, calibration and validation of hydrologic calculation models, dimensioning and operation of facilities in water industry

Industry and Hydropower

image010Flow measurements of inlets and outlets conducting cooling water, circulation systems and turbine intakes of power plants and industry; penstock monitoring and turbine efficiency monitoring

Water Supply & Water Distribution

image012Measurement of level and pressure in deep wells and conveyor systems as well as flow measurements at elevated tanks, water purification plants and water treatment plants

NIVUS provides the best possible measurement method for all applications

Cross Correlation Method

image014The measurement method for universal use in slight to heavily polluted water

Very high accuracy

Measures the real flow velocity profile

image016Reflectors within the water (particles, mi-nerals or gas bubbles) are scanned by an ultrasonic impulse and subsequently are saved as echo patterns.

A second scan follows a few milli-seconds later. Correlating both signals allows us to calculate the flow velocity. Repeating this procedure in varying flow levels enables determination of the real flow velocity profile.

Doppler Method

image018For measurement in slight to heavily polluted water

Latest intelligent fourth-generation Doppler technology

image020The Doppler method uses a continuous ultrasonic signal with a defined frequen-cy and a known angle to be sent into the water.

The moving particles generate a fre-quency shift which is proportional to the flow velocity of particles. These values are used for statistical averaging.

The Doppler method cannot be used to perform distance-related flow velocity measurements

Transit Time Method

image022For clean to slightly

polluted water

Meets IEC 41 requirements Very high measurement accuracy

image024The transit time method is based on detecting the transit time of ultrasonic signals between two sensors.

Here the signal transit time towards the flow direction is shorter than against the flow direction. The difference between both transit times is proportional to the average flow velocity along the measurement path.

The average velocity within the section is calculated by the transmitter

Waste water flow measurement

Cross Correlation Method

The unique NIVUS cross correlation flow meters feature a patented profiling technology for accurate flow measurements, providing outstanding flow measurement performance


image030 image032


Permanent Measurement Systems


image044Very high accuracy

High reliability thanks to investigation and indication of real flow velocity profiles

Easy operation through dialog mode, no programming skills required

Uncomplicated integration into existing control systems via universal interfaces

No velocity calibration required due to measurement of real flow velocity profiles

Up to 3 flow velocity sensors may be connected

Grid measurement on board (according to DIN EN ISO 748)

Portable Measurement Systems


image062Portable flow measurement using high accurate ultrasonic cross correlation, measurement of the real flow velocity profile

No velocity calibration required thanks to measuring the

real flow velocity profile

User-oriented operation conception

Back-lit graphic display for easy reading

Easy operation through dialog mode, e.g. start-up assistant

Long battery life through discharge-dependent measuring cycles

Mains power connection possible

Data transmission via GPRS modem and Bluetooth

Versatile connection options for peripheral devices

Grid measurement on board (according to DIN EN ISO 748)

Water flow measurement


image064Flow measurement for clean to slightly polluted water in full pipes

High stability due to 2 measurement paths

Reliable commissioning due to software-supported sensor alignment

Easy operation thanks to menu-based dialog mode

Uncomplicated integration into existing control systems via universal interfaces

Portable flow measurement using the transit time method (Clamp-On)

image070Non-contacting and hence independent from pressure and temperature

External pressure sensor can be connected

For long-term and leakage monitoring

Easy, space-saving installation

Data transmission worldwide possible via GPRS modem

image068 image066


Ultrasonic Measurement Principle


The sensor continuously transmits ultra-sonic impulses which are reflected from the surface of the liquid. The reflected waves are detected by the sensor again. Level, distance or volume are calculated depending on the sound transit time.

Hydrostatic Measurement Principle


Pressure sensors convert the mechanic parameter “pressure” into a direct proportional electric signal. The built-in amplifier converts the electric sensor signal into an easy-to-handle standard signal of 4…20 mA.

Pressure Measurement

image114 image116