Chemistry: physical processes – Physical processes – Crystallization
Patent
1975-08-19
1976-06-01
Serwin, R. E.
Chemistry: physical processes
Physical processes
Crystallization
23230B, 23515113, 23515135, G01N 3316, G06F 1542
Patent
active
039604977
ABSTRACT:
Improved apparatus for automatically calibrating and verifying the calibration of a chemical analyzer of the type which determines the concentration of a component in chemical or biological samples, e.g. concentration of glucose in blood or urine, wherein a sample changer sequentially advances samples into position for analysis. Calibration of the analyzer is performed by measuring a calibration standard of known concentration and generating a conversion factor therefor which converts the measured value of the standard to the known value thereof. Means is provided for storing conversion factors and proper calibration of the analyzer is verified by comparing successive conversion factors. If the compared conversion factors differ by more than a predetermined amount, the sample changer is halted and the calibration standard is remeasured. Measurement of the calibration standard is repeated until either two successive calibration factors are generated which differ by less than the predetermined amount, or until a predetermined number of unsuccessful measurements are made at which time the analyzer is stopped.
REFERENCES:
patent: 3535084 (1970-10-01), Izawa
patent: 3565582 (1971-02-01), Young
patent: 3860393 (1975-01-01), Campen
patent: 3874850 (1975-04-01), Sorensen et al.
patent: 3907503 (1975-09-01), Betts et al.
Beckman Instruments Inc.
Meads R. R.
Serwin R. E.
Steinmeyer R. J.
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