SONOFLOW® CO.55 | Ultrasonic Clamp-On Flow Meter

for non-contact contamination-free flow metering on flexible tubes

Ultrasonic flow sensor made of stainless steel and with integrated displaySensor for ultrasonic flow rate measurement made of aluminum with bpt tubingNon-invasive flow sensor made of pvc
Ultrasonic flow sensor made of stainless steel and with integrated displaySensor for ultrasonic flow rate measurement made of aluminum with bpt tubingNon-invasive flow sensor made of pvc


  • Clamp-on ultrasonic flow meter for highly accurate non-invasive flow measurement
  • No interference with the liquid
  • Quick measurement of pulsating and bi-directional flow
  • Great features for volume dosing
  • Built-in electronics, no external electronic board required

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SONOFLOW® CO.55 Clamp-On Flow Meter: Non-invasive Sensor for liquid flow measurement

The ultrasonic flow meter SONOFLOW® CO.55 detects the flow rate of liquids in plastic tubes quickly and reliably. The non-invasive sensor has no contact to the medium and is particularly suited for applications with strict hygienic standards. The clamp-on mounting concept eliminates any risk of contamination or leaking.

Beside multiple off-the-shelf standard sizes, different housing materials, such as aluminum, stainless steel or plastics, are also available.

The contactless flow meter SONOFLOW® CO.55 combines precise measuring performance and high quality with a unique compact and cost efficient sensor concept.

If you want to perform non-contact measurements on rigid plastic tubes and pipes:

SEMIFLOW CO.65 Ultrasonic Clamp-on Flow Meter

The SONOFLOW® Principle - Smart Sensoring the way you need it!

SONOFLOW® CO.55 Flow Meter for highly accurate flow measurement - Key Features

Flow Measurement on Flexible Plastic Tubes

  • Multiple off-the-shelf standard sizes for various tubing dimensions
  • Sensor solutions for tubing materials, such as PVC, silicone, PFA, PTFE, etc.

Signal Processing

  • Complete electronic signal processing unit integrated into the sensor body
  • No external electronics board or display required
  • Configurable current, frequency or pulse output

System Integration

  • Easy to integrate into existing systems via RS485 interface
  • Advanced software tool for parameterization and calibration
  • Convenient readout of measuring values
  • Optional SONOFLOW® C³ | Software to provide user-friendly sensor operation and adjustment features

Configuration & Customization

  • Parameter settings can be adapted regarding individual tube sizes and materials, fluids, flow ranges and temperature
  • In addition to our standard products, SONOTEC® also manufactures customer-specific solutions

Technical Data



MEASUREMENT METHODFlow Measurement with Transit Time Principle


3.5 mm to 34 mm


4 mm to 35 mm


PVC, Silikon, PTFE, PFA, FEP, TPE, Tygon, PE, etc.


Aluminum, Stainlesse Steel, Plastics


Display, Inlay, Handle

360° Product View

Useful SONOFLOW® Accessories


SONOFLOW® C³ | Software constitutes a milestone in user-friendly smart sensoring. The software assures a straightforward application of SEMIFLOW sensors in regard of

  • SEMIFLOW sensor operations
  • SEMIFLOW sensor adjustments

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SONOFLOW® RD.10 | Remote Display is the convenient accessory for easy connection with all SEMIFLOW sensors to guarantee

  • Permanent or temporary on the spot data analyzing
  • Zero calibration and volume reset

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Application Notes & Product Expertise | SONOFLOW® CO.55 Clamp-on Flow Meter

Sensor Performance Insights |
Medical Technology

Innovative SONOFLOW® Flow Sensor for new mobile drive unit EXCOR® Active applied at paracorporeal pulsatile ventricular heart assist devices

Sensor Performance Insights |
Bio Processing

Flow Sensor Performance Comparison:
Application on flexible tubes and tested in realistic environment | SONOFLOW® CO.55 Clamp-on Flow Meter

Sensor Expertise

Utilizing the Ultrasonic Transit Time Method:
Engineering and physical principles of non-contact SONOFLOW® CO.55 Flow Sensors

White Paper | Clamp-on Flow Meters For Process Monitoring: Technological Details & Mathematical-physical derivations


  • Heart-Lung Machines
  • Organ Transport Systems
  • Dialysis Machines
  • Chemical Spray Systems
  • Dosing Systems
  • Bioprocessing
  • Pump Protection
  • Vaccine Manufacturing
  • Lab Use
  • Mixing Equipment
  • Chemical Supply Systems

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Mandy Reber

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Mandy Reber

+49 (0)345 / 133 17-832