Abstract:
A liquid level sensing device for sensing the level of a liquid in a container and an automated, continuous and random access analytical system containing such liquid level sensing device and capable of simultaneously effecting multiple assays of a plurality of liquid samples are disclosed. The liquid level sensing device comprises: (a) means for producing an electrical sinusoidal signal; (b) means for evaluating the amount of signal as it propagates from a probe to a sense antenna; (c) circuit means for creating an electrical signal wherein said electrical signal changes when a probe contacts liquid; (d) signal processing means for enhancing the electrical signal and for degrading and suppressing signals not associated with the probe contacting said liquid; (e) decision circuit means for causing a basic digital output indicating either the presence or absence of liquid; and (f) means for utilizing the digital signal for controlling motion, and wherein said sensing device detects signal change and rate of signal change.
Abstract:
A method for controlling evaporation and contamination of reagents used in automated diagnostic systems is disclosed as well as an apparatus for opening and closing reagent containers contained within a reagent pack having cover and cap means for such controlling of evaporation and contamination. The method comprises (a) moving reagent packs containing reagents in closed reagent containers mounted in a reagent pack carousel to an opening and closing station, (b) forcing open the evaporatively closed reagent containers contained in the reagent pack by the opening and closing station, (c) locking in an open position the reagent containers cover and cap which is affixed to the reagent containers, (d) moving the locked open reagent containers from the opening and closing station on the reagent pack carousel to a position wherein the system has access to the reagents, (e) withdrawing reagents from the reagent containers for system use, (f) returning the reagent pack and reagent containers on the reagent pack carousel to the opening and closing station, (g) unlocking the lock open cover and cap of the reagent containers, (h) force closing the cover and cap of the reagent containers of the reagent pack, and (i) removing the reagent pack from the opening and closing station.
Abstract:
A cartridge feeder apparatus for automated diagnostic systems is disclosed. The apparatus comprises a cartridge hopper means for receiving, storing and feeding cartridges (68) to a cartridge orientation mechanism, the cartridge orientation mechanism comprised of two opposed engageable orientation means (239) for engaging and disengaging a cartridge at each end of the cartridge. The cartridge has a funnel opening at a first end and a generally flat bottom at a second end.
Abstract:
A method for controlling evaporation and contamination of reagents used in automated diagnostic systems is disclosed as well as an apparatus for opening and closing reagent containers contained within a reagent pack having cover and cap means for such controlling of evaporation and contamination. The method comprises (a) moving reagent packs containing reagents in closed reagent containers mounted in a reagent pack carousel to an opening and closing station, (b) forcing open the evaporatively closed reagent containers contained in the reagent pack by the opening and closing station, (c) locking in an open position the reagent containers cover and cap which is affixed to the reagent containers, (d) moving the locked open reagent containers from the opening and closing station on the reagent pack carousel to a position wherein the system has access to the reagents, (e) withdrawing reagents from the reagent containers for system use, (f) returning the reagent pack and reagent containers on the reagent pack carousel to the opening and closing station, (g) unlocking the lock open cover and cap of the reagent containers, (h) force closing the cover and cap of the reagent containers of the reagent pack, and (i) removing the reagent pack from the opening and closing station.
Abstract:
The invention relates to an automated liquid level sensing system for detecting the presence of liquid in a container, said liquid level sensing system comprising: a vertically oriented, electrically conductive probe positioned above said container; means for vertically moving said probe into and out of said container; a signal source electrically connected to said probe, said signal source energizing said probe with an electrical signal and causing said probe to transmit said electrical signal; a receiving antenna positioned below said container for receiving said transmitted electrical signal; means for analyzing said received electrical signal for indications that said probe has contacted liquid in said container; means for transferring said received electrical signal from said receiving antenna to said analyzing means; and means for indicating that liquid has been detected. Further, the invention also provides for a method for automatically detecting the presence of liquid in a container, said method comprising the steps of: vertically positioning an electrically conductive probe above said container; vertically moving said probe into and out of said container; electrically connecting a signal source to said probe, said signal source energizing said probe with an electrical signal and causing said probe to transmit said electrical signal; positioning a receiving antenna below said container for receiving said transmitted electrical signal; analyzing said received electrical signal for indications that said probe has contacted liquid in said container; transferring said received electrical signal from said receiving antenna to said analyzing means; and indicating that liquid has been detected.