Boots – shoes – and leggings
Patent
1988-03-25
1990-08-07
Gruber, Felix D.
Boots, shoes, and leggings
73 52, 374 4, 364557, G06F 1532, G01M 332, G01K 1300
Patent
active
049473522
ABSTRACT:
A microprocessor is employed to control a test program which operates to cause a component under test to be filled (or evacuated) to a predetermined pressure P.sub.2 at which a leak test is to be carried out. The test program is arranged firstly to perform a rapid test at atmospheric pressure P.sub.1 to determine the pressure change dpl'/dt in the component due to the temperature fluctuation. The component is then filled (or evacuated) automatically to the test pressure P.sub.T, at which the leak check is carried out. Temperature compensation is achieved by subtracting the value of C dpl'/dt from the pressure change dp.sub.t /dt actually measured, i.e. the actual leak rate dPL/dt is given by ##EQU1## where the constant, C, is generated from an identical proram run, the calibration run, on a known non-leaker with a high temperature fluctuation.
REFERENCES:
patent: 3987664 (1976-10-01), Hass et al.
patent: 4468968 (1984-09-01), Kee
patent: 4675834 (1987-06-01), Furuse
Korn and Korn: Electronic Analog Computers (Textbook), McGraw-Hill 1956, pp. 395-406 of interest.
"Model 102 Qualitek", brochure-ITI Industrial-4-page brochure.
"Qualitek 102-2 User Manual"-Compiled: D. Morris, R. Guy-11/86-44 pages.
Casella Anthony J.
Gruber Felix D.
Hespos Gerald E.
Ion Track Instruments, Inc.
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