Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing liquid or solid sample
Reexamination Certificate
1998-11-18
2001-08-28
Ludlow, Jan (Department: 1743)
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing liquid or solid sample
C422S050000, C422S063000, C422S081000, C422S105000, C422S105000, C436S179000, C436S180000, C134S16900A, C134S170000, C392S485000, C392S486000, C392S488000, C392S489000, C392S441000, C392S445000
Reexamination Certificate
active
06280688
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to analytical instruments. In particular, the present invention relates to a rinsing device coupleable to an analytical instrument for rinsing sample processing components of the analytical instrument.
Analytical instruments are known which analyze various attributes of samples including liquid samples, such as drinking water or waste water samples and solid samples such as soil samples or gas samples. For example, such instruments may measure carbon content in water samples or volatile organic compounds (VOC) in soil samples.
Analytical instruments include autosamplers for systematically extracting samples for analysis, as well as purge and trap concentrators which are used with a liquid sample to prepare a gaseous sample for analysis by another analytical instrument such as a gas chromatograph. Such instruments may be connected for continuous operation for extracting, processing and analyzing samples.
During operation of an analytical instrument, sample may flow through sample processing components to extract a sample and process the sample for analysis. It is important to maintain a virgin sample for accurate measurement and analysis results. However, residue from prior samples can be deposited on the sample processing components and can be introduced in a subsequent sample thus contaminating the analysis of the subsequent sample. Thus it is desirable to remove residue from the sampling processing components prior to a subsequent testing cycle.
SUMMARY OF THE INVENTION
The present invention relates to a rinse device which intermittently provides heated rinsing fluid to the sample processing components for rinsing residue from a prior sampling cycle. The rinse device is a multi-stage heating apparatus including first and second reservoir chambers separated by a restricted passageway. Fluid is sequentially heated by the first and second reservoir chambers for discharge to rinse sampling processing components of an analytical instrument. The multi-stage heater improves temperature control for better temperature consistency for rinsing applications.
In one embodiment of the rinse device the reservoir includes a temperature sensor for controlling the temperature of the rinse fluid within the reservoir chambers. The sensor is coupled to a controller for energizing the heat source so that the temperature of the fluid in the reservoir is maintained within a desired temperature range for optimum effectiveness.
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Bex Patricia Kathryn
Ludlow Jan
Tekmar Company
Westman, Chaplin & Kelly, P.A.
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