The Ultrasonic Flow Meter (UFM) provides a highly accurate direct and rapid measurement of liquid mass flowrate, e.g. propellant consumption in satellite bi-propellant propulsion systems. Because of its non-intrusive nature, the unit imposes negligible pressure losses.

The Ultrasonic Flow Meter principle is based on the so-called propagating or transit-time flow measurement method, which is the most suitable method for accurate measurements with liquid media. Two transducers are both used to send an ultrasonic signal and to receive the signal propagated through the fluid. Since the fluid is moving, the signal transit time in the downstream direction is shorter than the transit time in the upstream direction. This difference is proportional to the flow velocity, from which in turn the volume flow rate can be derived. The measurement is independent of the sound velocity of the liquid, hence is medium independent. Because of the fast response time, both steady-state Liquid Apogee Engine massflow and Reaction Control Thruster pulses can be recorded. The flowtube can be fully welded as integrated part of CPS tubing. Each flowtube is delivered with dedicated E-box with signal processing electronics.

Key Advantages:

  • Pre-qualified for telecom/GEO (Hi-Rel EEE-parts) applications
  • Excellent performance characteristics
  • High-accuracy thermal calibration
  • Optional totalizer and empty flowtube detection
  • Heritage for on-ground RCT characterizations (hydrazine), Refuelling subsystem prototyping and GEO CPS demonstration
  • Production heritage of Titanium and stainless steel versions

Performance Characteristics