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sonar - ultrasonic flow meter

The installation of an ultrasonic heat meter is frequently required where there are special technical or structural requirements.

For these cases, ZENNER provides an intelligent solution with its sonar ultrasonic volumetric flow sensor.

Ultrasonic volumetric flow sensors have the great advantage that there are no moveable parts in the volume flow. As a result, ultrasonic heat meters are as insensitive possible to deposits in the medium measured and can function silently and almost free from wear. In addition, ultrasonic heat meters can be loaded up to twice the nominal flow, which guarantees reliable measurement and a long service life for the measurement unit. These can be installed in any position, although overhead installation is not permitted. The flow rate of the medium measured is determined using the transit time difference method. To this end, an ultrasonic signal is transmitted, once in the direction of flow and once against the direction of flow. The signal is accelerated in the direction of the volume flow and delayed against the direction of flow. The flow rate can be deduced from the transit time difference measured and from this, in turn, the volume.

The volume information is transferred to the heat calculator by means of electronic impulses. One particular performance feature of the ZENNER ultrasonic volumetric flow sensors is the automatic monitoring. The electronic measuring equipment continuously monitors the signals transmitted by the flow sensor in terms of its quality – fouling of the sensors is immediately registered.

The volumetric flow sensor electronics can be removed with just a few flicks of the wrist – hence, the ultrasonic heat meter can also be ideally installed where space is extremely limited. The sonar volumetric flow sensor can be ideally combined with the multidata WR3 heat calculator.

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Product images

Ultrasonic Flow Sensor sonar
Ultrasonic Flow Sensor sonarUltrasonic Splitt Heat Meter with Ultrasonic Flow Sensor sonar


sonar - ultrasonic flow meter


  • 6-year long-life battery
  • Automatic monitoring of the ultrasonic system and the electronics
  • volumetric flow sensor for installation of the ultrasonic heat meter in any position
  • No inlet or outlet zone required
  • Loadable up to twice the nominal flow
  • Not sensitive to foreign bodies in the heating medium
  • Almost silent operation

Product options

Measuring Principle
  • Ultrasonic Meters
  • Electronic
Nominal Diameter DN (mm)
  • DN 50
  • DN 80
  • DN 100
Length without connectors
  • 200 mm
  • 270 mm
  • 300 mm
  • 360 mm
  • Hot Water up to 120° C
Housing Material
  • Brass
Nominal Flow qp (Heat Meters)
  • qp = 15
  • qp = 25
  • qp = 40
  • qp = 60
Specified Units on Display
  • Cubic Meters (m³)


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