Flow Meters and Sensors

Flow Meters on a spacecraft are used to measure the levels of gaseous or liquid media in a propulsion system.

Ultrasonic Flow Meter (UFM)

The UFM provides highly accurate direct and rapid measurements of liquid mass flow rates, such as propellant consumption in bipropellant satellite propulsion systems. Because of its non-intrusive nature, the unit imposes negligible pressure losses.

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Xenon Flow Meter (XFM)

The XFM is a gauging component for mass flow rate of gaseous xenon based on thermal capacity measurements. The measurement principle is tailored for very low mass flow rates but can be up-scaled to fit any requirement.

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Micro Flow Sensor (MFS)

The MFS is a gauging component for mass flow rate of gaseous media based on thermal capacity measurements. The measurement principle is tailored for very low mass flow rates of 0 to 1 mg/s but can be up-scaled to fit any requirement.

Missions: LISA Pathfinder

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Ultrasonic Gauging Sensor

The Ultrasonic Gauging Sensor (UGS) is an ultrasonic transit time measurement principle based, fully ESA qualified, level gauging device. The UGS is designed to measure the remaining amount of propellant in propellant tanks. In the UGS, the transit time of the ultrasonic signal is a measure for the level in the tanks. It consists of a titanium housing inserted into the propellant port, which is part of the propellant tank.

Missions: MSG-4 (TBD)

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Flow Restrictor

The Flow Restrictor (FR) is designed as a hydraulic restrictor. A predefined hydraulic resistance improves the required flow dynamics. The FR design is based on a sintered metal porous element located inside the flow tube. This design ensures excellent flow and lifetime stability capabilities and minimizes size and mass.

Missions: The FR is used in the Moog Bradford Flow Control Unit in combination with a flow/pressure feedback sensor (QinetiQ Comsat and BepiColombo).