Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-04-30
1985-11-05
Levy, Stewart J.
Communications: electrical
Condition responsive indicating system
Specific condition
34087029, 34087031, 235464, 250231SE, 318313, 318327, 324174, 324175, 494 9, 494 10, G01P 3481
Patent
active
045517150
ABSTRACT:
An apparatus for determining the actual speed and maximum safe speed of a centrifuge rotor. A single circular array of equally spaced coding elements of two clearly distinguishable types is attached to the rotor. A single detector responsive to the coding elements produces an output signal that varies in accordance with both the number and type of the coding elements. A first circuit network is responsive to the number of coding elements encountered per unit time, without regard to type, to produce an actual speed or tachometer signal. A second circuit network is responsive to the number of coding elements of each type encountered during each revolution of the rotor, without regard to the speed thereof, to produce a rotor identification signal that is indicative of the maximum safe speed of the rotor.
REFERENCES:
patent: 3462670 (1969-08-01), Waye
patent: 3582699 (1971-06-01), Badessa et al.
patent: 3746247 (1973-07-01), Camilliere
patent: 3982162 (1976-09-01), Olliffe
patent: 4205261 (1980-05-01), Franklin
patent: 4257040 (1981-03-01), Shirasaki et al.
Beckman Instruments Inc.
Chapman, Jr. John E.
Harder P. R.
Levy Stewart J.
May W. H.
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