Q2 / KDO - Speed flow meter

Q2/KDO Flow Meter

Flow velocity measurement using the Doppler method

KDO sensors measure the flow rate of a liquid and thus, in conjunction with the sophisticated software of the Q2 / KDO unit, enable a modern way of measuring the water flow in open profiles or in pipes without the need to build a measuring flume or overflow. Měření průtoku Q2/KDO Dopplerovou metodou

Flowmeter characteristics

  • High range of flow velocity measurement in both directions, up to ± 6 m/s
  • The flow meter is designed for installation both in the open channels and in pipe walls
  • The aerodynamic shape of the speed probe minimally disturbs the flow
  • No mechanical moving parts
  • A particularly advantageous flow measuring solution for locations without existing or hydraulically unsatisfactory measuring profiles
  • Telemetry unit with automatic transfer of data to a remote database 
  • Rich software support through our cloud (graphs and charts, exports, print outs of monthly balances, ...)
  • Easy upgrade of the flow meter to measure other quantities (levels, pressures, temperatures, ...)
  • Built-in PLC for controlling smaller WWTPs, pumping stations, etc.
  • Flowmeter parameters configurable via the Internet
The Q2 / KDO unit in the flowmeter mode calculates the current liquid flow as a multiple of the cross-sectional velocity and the size of the cross-sectional area. The size of the cross-sectional area is calculated on the basis of the measured depth or by using a level-area table.

The intelligent KDO flow rate sensor from the German company NIVUS GmbH works using the Doppler principle and is supplied in a mechanical design suited for mounting on the bottom of the gutter (KDO/S) or in the pipe wall (KDO/P).

The sensor emits a series of ultrasonic pulses into the measured medium at an angle of 45 ° and evaluates the flow velocity based on the measurement of the frequency shift of the signal reflected from the particles carried by the flow. This measuring method also makes it possible to measure the backflow speed and can be used up to a maximum speed of 6 m/sec.

The sensor includes a 30 m long cable through which the sensor is powered from the Q2/KDO unit and through which data communication also takes place via the RS485 interface under the MODBUS RTU protocol. If required, this cable can be extended to a lenght of up to 120 m.


Examples of using a KDO flow meter

The KDO sensor offers a modern way of measuring the flow of water in pipes or in open profiles without the need to build a measuring flume or overflow. In conjunction with the Q2-G / KDO telemetry unit, which can automatically transfer the measured data to a database on a server, it forms a solution with great utility value. It can be used especially in:

  • Measurement of wastewater flow at WWTPs and industrial plants.
  • Monitoring of flows of smaller streams and rivers and everywhere where it is not possible to build specific profiles due to narrowing of the flow profile or insufficient height difference.

Selected features of the Q2-G / KDO unit

  • Temperature correction of the fluid velocity according to its temperature.
  • Calculation and archiving of current and accumulated flow. When measuring in an open channel, the measured level and temperature can also be recorded separately.
  • Recording of error messages from the sensor and sending of SMS warnings.
  • Monitoring of other connected technology - the Q2 / KDO unit contains 16 recording channels for measuring flows, levels and other quantities.
  • Automatic transmission of measured data to a server at set times, transition to more frequent data transmissions after evaluation of the alarm condition.
  • Parameterization via the server, including saving changes in settings, adjusting the station time according to the server.

Dimensions of KDO sensors

KDO/S sensor for free flows - location on the bottom of the sewer:
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