Data processing: measuring – calibrating – or testing – Measurement system – Statistical measurement
Reexamination Certificate
2005-02-01
2005-02-01
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Statistical measurement
C702S022000, C702S050000, C324S439000, C324S444000, C324S698000
Reexamination Certificate
active
06850865
ABSTRACT:
A tubular probe having annularly spaced electrodes is immersed in ATF and sequentially excited with an alternating voltage at a relatively high and low frequency. The current is measured at both frequencies and the difference in impedance computed; and, the differential impedance is corrected for temperature and the corresponding value of one of TAN per ASTM D-669, Delta Oxidation per ASTME-168 (ΔOX) and HPDSC induction time per ASTM D-5483 (MIN) determined from a lookup table of values of TAN, ΔOX and MIN versus impedance differential for known fluid conditions. The remaining useful life (RUL) may then be computed from determined present value of TAN, ΔOX or MIN. When the temperature corrected impedance difference ΔZTCreaches 6.5×105Ohms, the ATF is considered to have reached the end of its useful life.
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Hirthe Richard W.
Schachameyer Sher
Shtaida Victor E.
Zou Lian Q.
Barlow John
Eaton Corporation
Johnston Roger A.
Vo Hien
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