Liquid transfer device for an analysis unit

Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Sample mechanical transport means in or for automated...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

422 50, 422 63, 422 64, 422 65, 422 66, 422100, 422102, 73 6163, G01F 2324

Patent

active

053043472

ABSTRACT:
Liquid transfer device for an analysis unit with a capacitive liquid level detector (10) for detecting the dipping of a liquid transfer needle (5) into an analysis liquid (4). More reliable operation, in particular a better ratio between useful signal and noise signals, is achieved by the fact that the liquid transfer needle (5) is part of a coaxial electrode arrangement (11). The coaxial electrode arrangement includes, in addition to the liquid transfer needle (5), at least one coaxial electrode (12, 13) surrounding the needle and insulating from it and a detection circuit (17). This detection circuit detects a change in capacitance between the electrodes (5, 13) of the liquid level detector (10), and includes an isolation amplifier circuit (23) to whose input (23a) and output (23b) two adjacent electrodes (5, 12) of the coaxial electrode arrangement (11) are connected as signal electrode and compensating electrode. As a result of this structure, no voltage difference occurs between the signal electrode and the compensating electrode.

REFERENCES:
patent: 3754444 (1973-08-01), Ure et al.
patent: 4338279 (1982-07-01), Orimo et al.
patent: 4451433 (1984-05-01), Yamashita et al.
patent: 4543238 (1985-09-01), Mimura et al.
patent: 4647432 (1987-03-01), Wakatake
patent: 4736638 (1988-04-01), Okawa et al.
patent: 4818492 (1989-04-01), Shimizu
patent: 4939925 (1990-07-01), Sakuma et al.
patent: 5004582 (1991-04-01), Miyata et al.
patent: 5045286 (1991-09-01), Kitajima et al.
patent: 5049826 (1991-09-01), Sasao
patent: 5104621 (1992-04-01), Pfast et al.
patent: 5147610 (1992-09-01), Watanabe et al.
patent: 5178835 (1993-01-01), Uekusa et al.
Abstract of DE 32 48 449; Derwent-Recherche.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Liquid transfer device for an analysis unit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Liquid transfer device for an analysis unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid transfer device for an analysis unit will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-18276

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.