Flow Meter

NivuFlow 7550

Part No. N75-5KR1

Hybrid Flow Measurement with Surface Radar and Ultrasonic Profile Scanner

Flow measurement for open channels as well as part filled pipes. Optimum results through combination of ultrasonic cross correlation and radar technology.

  • Redundant flow measurement 
  • Contactless Radar surface velocity measurement
  • Ultrasonic sidewards velocity profile sensor
  • Two independent flow measurement technologies increase the accuracy and reliability
  • All sensors are above the area of sedimentation,
  • No maintenance
  • Reliable measurement  independently of wave formations, storm conditions as well as in low flow level circumstances
  • IoT-ready with global 4G connectivity for highest availability and digital services


Hybrid Flow Measurement

NivuFlow 7550 is a hybrid measurement system which was particularly developed for flow metering in part filled pipes, channels and surface waters. Mainly in difficult applications the flow meter stands out for reliable results thanks to its advantages by using two measurement technologies.

Contactless Radar Flow Measurement

The contactless low-maintenance radar sensor provides reliable operation even at very high discharge velocities with low flow levels. Dynamic hydraulic models for various channel shapes based on varying filling levels enable accurate detection of the real flow rate.

Ultrasonic Flow Measurement as Overflow Sensor

The ultrasonic cross correlation sensor can be used as overflow sensor. In such cases the sensor provides reliable and accurate results in overflow situations where radar sensors cannot be used for measuring. Thanks to the flow profile detection and the detection of sedimentation on the bottom the flow rate is determined very accurately. Information on sedimentation is also considered for further measurements using the radar system.

Ultrasonic Flow Measurement as Redundant Measurement

The ultrasonic sensor can be used as permanent redundant measurement too. Installing the sensor on the side walls above the sedimentation helps to avoid soiling. The detection of local flow velocities covers the entire channel width and guarantees the determination of very accurate flow profiles. Pre-programmed hydraulic models increase the accuracy of the measurement system.

Easy Installation and Handling

Due to DIN rail mounting options the compact transmitter saves space and can be installed easily in control cabinets. Moreover the NivuFlow 7550 is available with a special protected field enclosure for use under harsh ambient conditions. The large graphic display permits quick and easy commissioning of the flow meter system.

NivuFlow 550 provides extended diagnostic options and facilitates in-depth analysis of running processes on site. The transmitter software is in line with current requirements. Future-proof protocols and versatile communication and integration options open many ways for operators to integrate the devices into higher systems such as SCADA or process control systems.


Typical NivuFlow 7550 Applications

  • Continuous and reliable flow metering in overflow situations
  • Sedimentation detection with ultrasonic level measurement in case of overflow
  • Measurement places featuring high dirt loads and sedimentation
  • Measurement places featuring bed load / debris
  • Measurement places with limited installation options within the channel
  • Reliable flow metering in shooting discharge and low flow levels
Technical Data
Power supply

100 to 240 V AC, +10 % /-15 %, 47 to 63 Hz or 9-36 V DC

Power consumption

14 VA typical

  • Aluminium, plastic (transmitter enclosure)
  • Plastic (field enclosure)

IP 20, IP 68 with optional field enclosure

Operating temperature

−20°C to +70°C

Max. humidity

80%, non-condensing


240 x 320 pixel, 65536 colours

Range of operation

rotary pushbutton, 2 function keys, menus in English, French and other languages


plug with cage clamp terminals


up to 7 x 4 - 20 mA, up to 4 x RS 485


up to 4 x 0/4 – 20 mA, up to 5 x relays (SPDT)

Data memory

2.0 GB internal memory, flexibly expandable, readout on faceplate via USB stick

Communication (optional)

Modbus, HART®

Measurement uncertainty

flow (Q): ± 5% typical; ± 2% under reference conditions

Measurement principle

radar in combination with ultrasonic crosscorrelation

Specifications subject to change.


Data Sheet NivuFlow 550/NivuFlow 7550

Instruction Manual "Flow Measurement Transmitter NivuFlow 7550"

Technical description data transmission - addition to manual Rev01

NIVUS data transmission for NivuFlow 550, 600, 650, 7550, Energy Saver and NivuParQ 850 - addition to instruction manuals

Technical Instructions "NIVUS Modbus TCP/RTU"

Declaration of Conformity permanent flow measurement transmitter


Tender Specification "NivuFlow 7550"

System Products

Haven't found the appropriate product?

You haven’t found the right product? Then use our application configurator – it will get you to the right product step by step.

Also for your individual measurement spot we support you gladly. Please fill in our questionnaire.

Product Consultation

You want to have best information about our products? Our experts will gladly develop together with you the best system solution for your application.


You have questions about your NIVUS products in use? Our service hotline will readily support you.

We are glad to have you here! For any question regarding water or digitisation we are happy to answer you call or your email message.
Im Täle 2
75031 Eppingen