Device for controlling the particle flow in an apparatus for measuring the properties of particles suspended in liquid
First Claim
1. In an apparatus for the measurement of properties of particles held in suspension including:
- a housing defining therein a main measuring chamber separated into a first and a second chamber;
a separating wall separating both chambers and having a measuring aperture formed therein connecting the first and second chamber, wherein the first chamber is supplied with particle-free electrolyte;
means connected to the second chamber for maintaining the pressure in the second chamber below the pressure in the first chamber causing thereby the electrolyte to flow from the first chamber through the measuring aperture into the second chamber;
a first electrode mounted with the first chamber;
a second electrode mounted with the second chamber; and
a supply capillary tube subject to the surrounding atmospheric pressure for receiving the suspension and having an outlet, said supply capillary tube being mounted to extend with its outlet into the first chamber such that to allow the suspension to enter into the first chamber and be carried through the measuring aperture with the electrolyte, when the pressure in the supply capillary tube exceeds the pressure in the first chamber around the outlet, the improvement comprising;
a. said housing constructed to pressure isolate the first chamber from the surrounding atmosphere; and
b. a source of variable pressure connected to the first chamber for providing within said first chamber a variable pressure less than atmospheric pressure and above the pressure in the second chamber to effect the flow of particles containing suspension from the supply capillary tube into the first measuring chamber.
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Abstract
An apparatus for investigating the properties of particles held in liquid spension using the Coulter process, U.S. Pat. No. 2,656,508, wherein the flowrate of the particle suspension into the particle-free electrolyte carrier depends on the pressure difference between these two liquids. This pressure difference is made readily adjustable by setting the height of the level of the electrolyte by means of a separate, vertically movable chamber attached with a flexible lead to the main measuring chamber. The main measuring chamber is closed to the atmosphere, permitting maintenance of a pressure differential with respect to the atmosphere and with respect to the particle suspension.
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Citations
22 Claims
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1. In an apparatus for the measurement of properties of particles held in suspension including:
- a housing defining therein a main measuring chamber separated into a first and a second chamber;
a separating wall separating both chambers and having a measuring aperture formed therein connecting the first and second chamber, wherein the first chamber is supplied with particle-free electrolyte;
means connected to the second chamber for maintaining the pressure in the second chamber below the pressure in the first chamber causing thereby the electrolyte to flow from the first chamber through the measuring aperture into the second chamber;
a first electrode mounted with the first chamber;
a second electrode mounted with the second chamber; and
a supply capillary tube subject to the surrounding atmospheric pressure for receiving the suspension and having an outlet, said supply capillary tube being mounted to extend with its outlet into the first chamber such that to allow the suspension to enter into the first chamber and be carried through the measuring aperture with the electrolyte, when the pressure in the supply capillary tube exceeds the pressure in the first chamber around the outlet, the improvement comprising;a. said housing constructed to pressure isolate the first chamber from the surrounding atmosphere; and b. a source of variable pressure connected to the first chamber for providing within said first chamber a variable pressure less than atmospheric pressure and above the pressure in the second chamber to effect the flow of particles containing suspension from the supply capillary tube into the first measuring chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- a housing defining therein a main measuring chamber separated into a first and a second chamber;
Specification