High pressure sample injection apparatus and method
First Claim
1. An injector for a liquid chromatograph for injecting a sample liquid into a high-pressure stream of carrier liquid, said injector comprising:
- a. structure defining a reservoir for the sample liquid,b. structure defining a dispensing chamber for receiving a measured volume of the sample liquid from said reservoir,c. structure defining a flow path for the high-pressure stream of carrier liquid,d. control structure means interposed between said dispensing chamber and said flow path for substantially preventing liquid flow from said flow path to said dispensing chamber, and for enabling liquid flow from said dispensing chamber to said flow path only when the pressure of said measured volume of sample liquid in said dispensing chamber is at least equal to the pressure of said high pressure stream of carrier liquid, ande. displacement means for limiting the volume of sample liquid receivable in said dispensing chamber and for imparting to the sample liquid in said dispensing chamber a pressure at least equal to the pressure of said high-pressure stream of carrier liquid.
0 Assignments
0 Petitions
Accused Products
Abstract
A high pressure sample injector for liquid chromatographs is disclosed. The apparatus includes structure defining a cylindrical dispensing chamber for receiving the sample to be injected into the flow path of a high pressure stream of carrier fluid in a liquid chromatograph. Control structure is interposed between the dispensing chamber and the flow path of the carrier stream for preventing liquid flow from the carrier stream to the dispensing chamber, and for enabling flow in the opposite direction only when the pressure in the dispensing chamber at least equals the carrier stream pressure. A pressurizing apparatus is connected to the dispensing chamber to raise its pressure, when desired, to a value at least equal to that of the carrier stream, in order that the sample may be injected into the carrier without reducing the carrier stream pressure.
25 Citations
13 Claims
-
1. An injector for a liquid chromatograph for injecting a sample liquid into a high-pressure stream of carrier liquid, said injector comprising:
-
a. structure defining a reservoir for the sample liquid, b. structure defining a dispensing chamber for receiving a measured volume of the sample liquid from said reservoir, c. structure defining a flow path for the high-pressure stream of carrier liquid, d. control structure means interposed between said dispensing chamber and said flow path for substantially preventing liquid flow from said flow path to said dispensing chamber, and for enabling liquid flow from said dispensing chamber to said flow path only when the pressure of said measured volume of sample liquid in said dispensing chamber is at least equal to the pressure of said high pressure stream of carrier liquid, and e. displacement means for limiting the volume of sample liquid receivable in said dispensing chamber and for imparting to the sample liquid in said dispensing chamber a pressure at least equal to the pressure of said high-pressure stream of carrier liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for injecting a sample liquid into a high-pressure stream of carrier liquid in a liquid chromatograph, said method comprising the steps of:
-
a. placing a measured volume of said sample liquid in a dispensing chamber, b. substantially preventing liquid flow from the stream of carrier liquid to the dispensing chamber, and enabling liquid flow from the dispensing chamber to the stream of carrier liquid only when the pressure of said measured volume of sample liquid in the dispensing chamber is at least equal to the pressure of the stream of carrier liquid, and c. raising the pressure of said measured volume of sample liquid in the dispensing chamber to a value at least equal to the pressure of the stream of carrier liquid. - View Dependent Claims (11, 12, 13)
-
Specification