Chemistry analyzer

Details Chemistry analyzer Chemistry analyzer

1995-08-09

1998-03-24

Le, Long V.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Sample mechanical transport means in or for automated...

422 63, 422100, 436 43, 436 47, 436 49, 436 54, 436164, 436180, 7386422, 7386434, 134 21, 134170, 134171, 356320, G01N 3510

Patent

active

057309388

ABSTRACT:
A carousel receives a plurality of removable reagent containers, a turntable receives a plurality of sample fluid containers and a rotatable cuvette assembly holds an annular array of reaction and test cuvettes. A robotic arm carrying a fluid transfer needle coupled to a pair of syringes picks up one or more reagents and sample fluid for deposit into a cuvette. As the arm moves the needle tip exterior is washed and contaminants sent to a waste collector. At the end of a test cycle, the needle core is flushed and cleaned. A colorimetry photometric test is performed on the reacted fluids in each cuvette by a system employing ten interference filters, corresponding diode detectors and amplifiers employing two identical multiplexers providing identical filtered signals for logarithmic calculation of absorbance. The calculation subtracts a noise base level signal of one filter output from one multiplexer from a peak level signal produced by a second filter output from the other multiplexer for each component under test. A reciprocating plunger aspirates and cleans each cuvette at a single cleaning station employing multiple reciprocating motions. The photometric test is completed on all cuvettes in a single test cycle which are subsequently cleaned for the next test sequence.

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