Non-Invasive Ultrasonic Flow Sensor

Our clamp-on ultrasonic em-tec flow sensors provide accurate, intuitive, and non-invasive flow measurement for use in biopharmaceutical processing.

  • Compact size to save space
  • Up to seven calibration tables per sensor
  • Transducers for a wide variety of tubing sizes

Watch the Video

Learn how em-tec provides accurate, intuitive and non-invasive ultrasonic flow sensors for use in biopharmaceutical processing. The BioProTT transducers, with transit-time technology, provide simple, clamp-on flow measurement of tubing systems in the video above.

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Space Saving Design

em-tec’s flow meter design allows you to save space and achieve greater accuracy in flow measurement with a non-invasive method. It is extremely compact due to a highly integrated digital electronic design.


The em-tec flow sensor comes pre-calibrated for the user, requires no priming, and contains the ability to use 7 different calibration tables – all on one sensor. The BioProTT transducer, with transit-time technology, provides simple, clamp-on flow measurement of tubing systems. The transducer quickly and easily clamps around flexible hoses with a click lock. This lock ensures that contamination and pressure-drops within the system will be avoided, as well as no extra assembly splicing.

The functional design of this em-tec flow meter features no moving parts and prevents any additional shearing on the process fluid, giving it a great advantage over invasive methods that also handle biomolecules or shear-sensitive organisms.

Features & Benefits

  • Non-invasive
  • The transducer encloses flexible tubing with its simple click closure in an effortless, non-invasive way
  • Transducers for a wide variety of tubing sizes available
  • Customer specific calibration for media, tubing, and temperature
  • Up to seven calibration tables can be stored on one sensor, allowing maximum flexibility
  • Excellent accuracy and stability
  • Water proof, easy to clean, and disinfectable surface
  • Easy installation into your current system, allowing for a non-invasive flow measurement
  • Different sensor sizes for all common tubing sizes
  • Due to the non-invasive design, there is no additional shear stress on cells
  • Device designed to be reusable for years


  • For flow measurement on flexible tubing in upstream and downstream applications
  • Filtration steps
  • Chromatography
  • Harvest applications
  • Filling
  • Process Evaluation
  • Research
  • As well as many other applications

Technical Specs

Features up to OD 5/8" up to OD 3/4" up to OD 1-1/8" up to OD 1-5/8"
Size (HxWxL) 25 x 33 x 45 mm 27 x 38 x 51 mm 35 x 43 x 69 mm 46 x 56 x 84 mm
Weight transducer head 52 g 72 g 140 – 160 g 295 – 315 g
Total weight (incl. cable / plug) 137 g 153 g 225 – 245 g 380 – 400 g
Cable length 2.9 m 2.9 m 2.9 m 2.9 m
IP-Code IP 67 IP 67 IP 67 IP 67

Product Comparison

Single-Use Flow Sensor
Flow Sensor


  • Ultrasonic sensor
  • Up to 7 calibration tables
  • Compact size
  • Waterproof design
  • Up to 50C operating temp
  • Customer specific calibration
Electromagnetic Flow Sensor


  • Accuracy of 1%
  • Gamma/Autoclave Stable Flow Tube
  • Minimal hold-up volume
  • Accommodates two flow tubes
  • Full bore flow path
  • Factory calibrated
Mass Coriolis Flow Sensor
Mass Coriolis
Flow Sensor


  • Accuracy: +/- 1% of flow
  • Gamma stable PEEK sensor
  • For ultra low flow
  • Flow pressure of 30 psi
  • Designed for measuring liquids
  • Materials: Unreinforced polyether ether ketone
Turbine Flow Sensor
Flow Sensor


  • Stainless steel flow sensor
  • Flow range: 0.06 – 40 L/min
  • 3 models available
  • High accuracy and repeatability
  • Infrared (IR) turbine rotor reflection
  • Suitable for opaque liquids

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