Apparatus for trasferring liquid having liquid level sensing fun

Details Apparatus for trasferring liquid having liquid level sensing fun Apparatus for trasferring liquid having liquid level sensing fun

1997-07-15

1999-01-05

Ludlow, Jan

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

7386401, 7386424, 141 96, 141130, 436 54, B01L 302

Patent

active

058558519

ABSTRACT:
The present invention relates to an apparatus for transferring a liquid capable of accurately performing detection of a liquid level using a pipetting probe even in a case of a high electric conductivity of a in-flow-passage moving fluid which transmits sucking and discharging operation of a syringe (107) to the pipetting probe (100, 400, 500, 600). The probe has a liquid level sensing electrode (103, 401, 501, 601) and an inner tube (102, 402, 502, 602). The liquid level sensing electrode capable of contacting with a liquid to be pipetted is electrically separated from an inner tube filled with the moving fluid, and the both are insulated by an electric insulating member (104B, 403, 503) between them. A container (111) containing the liquid to be pipetted is held by a container holder (112), and a liquid level can be detected by change in an electrostatic capacitance between the container holder and the liquid level sensing electrode of the probe when the probe is moved downward. During sucking the liquid, the inner tube is not brought in contact with the liquid. The inner tube and the container holder are grounded.

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patent: 5493922 (1996-02-01), Ramey et al.
patent: 5550059 (1996-08-01), Boger et al.
patent: 5648727 (1997-07-01), Tyberg et al.

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