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Boil-off flow: mass-flow meter on vent line (gas phase)
Mass loss: weigh the filled tank before/after
Level sensor (capacitance/RTD stack) to track liquid height over time
Temperatures: many thermocouples on tank wall, loop inlet/outlet, MLI outer surface, heater panels
Mixing Subsystem Demo - Testing that the pump can mix cold fluids with induced heat stratification in low gravity environments. Flight test on parabolic arc with 20 second periods of microgravity, or ground test by spinning the tank to create and artificial gravity and then stopping the tank suddenly.
- Sensors: thermocouples(mixing of fluid), pressure sensor(LN_2 boils off easily), liquid level sensor(detect sloshing and boil off), flow meter(how much fluid is being moved), IMU/accelerometer(identify periods of microgravity), voltage sensor(how much heat is added for induced stratification)