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Sierra Lobo tested its patented Cryo-Tracker(R) probe and Mass Gauging System in a large scale Expendable Launch
Vehicle (ELV) liquid oxygen tank simulation for NASA. Typical Liquid Oxygen (LOX) tank operations were
simulated at Lockheed Martin's Engineering Propulsion Laboratory in Denver, Colorado. The Cryo-Tracker(R) probe is
33 feet long, the longest built to date. It was mounted in the tank at only two locations, separated by 26 feet. Each test
simulated typical Lockheed Martin booster pre-launch tanking operations, including filling the tank with LOX at fill
rates typically used at the launch pad, and maintaining the fill level for a period representative of a typical pad hold.
The Cryo-Tracker(R) Mass Gauging System was the primary instrument used for monitoring the fill and controlling the
topping operations. Each test also simulated a typical flight profile, expelling the LOX at representative pressures and
expulsion flow rates. During expulsion, the Cryo-Tracker(R) System served to generate an Engine Cut-Off (ECO) signal.
Test objectives were as follows: Cryo-Tracker(R) data will be validated by flight-like propellant instruments currently
used in launch vehicles; the probe will survive the harsh environment (which will be documented by a digital video
camera) with no loss of signal or structural integrity; the system will successfully measure liquid levels and
temperatures under all conditions and calculate propellant mass in real-time; the system will successfully demonstrate
its feasibility as a control sensor for LOX filling and topping operations, as well as for engine cut-off. All objectives
were met and the test results are presented.
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