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Liquid Purification

Low-volume-non-bubble-collecting-pressure-dome

Control circuit assembly for heating elements in cooking plates

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Glass-ceramic cooking range with heating elements which glow quickly during the heating-up phase

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Plasticized EVOH and process and products utilizing same

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Low-volume non-bubble collecting pressure dome

Details

Inventors: Young, Joe W.; North, Michael V.; Rake, Kenneth W.;
Assignee: Baxter International Inc. (Deerfield, IL)
Primary Examiner: Truluck; Dalton L.
Assistant Examiner:
Attorney, Agent or Firm: Dahl; Debra E., Myers; Richard L., Peterson; Gordon L.

A pressure sensor comprising a main body having an inlet connectable to a source of liquid under pressure, an outlet, a passage extending through the main body from the inlet to the outlet and a surface outside of the passage. A flexible diaphragm confronts the surface and is coupled to the main body to at least partially define a sensing chamber. The main body has a port extending from the passage to the sensing chamber to provide communication between liquid under pressure in the passage and the sensing chamber. The port has a transverse cross section with at least one dimension which is no greater than about 0.060 inch.

DETAILED DESCRIPTION We claim: 1.
A pressure sensor comprising: a main body having an inlet connectable to a source of liquid under pressure which is subject to having bubbles therein, an outlet and a passage extending through the main body from the inlet to the outlet so that liquid can flow through the passage; a flexible diaphragm coupled to the main body and confronting a conical surface for defining a low-volume surface sensing chamber on the main body; a port defined in the main body extending from said passage to said sensing chamber to provide communication between liquid under pressure in the passage and the sensing chamber; and said port having at the juncture of the port and the passage, a transverse cross-section with at least one dimension sufficiently small to enable surface tension to substantially exclude bubbles in the liquid flowing through the passage from passing through the port into the sensing chamber, said port having a sharp edge with essentially no radius at said juncture which further serves to exclude bubbles in the liquid from passing through the port into the sensing chamber.
2.
A pressure sensor as defined in claim 1 wherein the length of the port is no more than about 21/2 times the transverse dimension at said juncture.
3.
A pressure sensor as defined in claim 1 wherein said port has a radiused edge at the juncture of the port and the conical surface of the main body.
4.
A pressure sensor comprising: a main body having an inlet connected to a source of liquid under pressure, an outlet, a passage extending through the main body from the inlet to the outlet so that liquid can flow through the passage; a flexible diaphragm confronting a conical surface of the main body coupled to the main body to at least partially define a sensing chamber; said main body having a port extending from said passage to said chamber to provide communication between the liquid under pressure in the passage and the sensing chamber; and said port at the juncture of the port and the passage having a transverse cross section with at least one dimension which is no greater than about 0

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