Indicator Strip and a Device for Automatic Testing of Liquids

• US 20080193331A1
• Filed: 07/04/2005
• Published: 08/14/2008
• Est. Priority Date: 07/04/2004
• Status: Active Grant

• Current Assignee: Ben David Tsur
• Original Assignee: Ben David Tsur
• Inventors: Tsur, Ben David
• Granted Patent: US 8,197,755 B2
• Time in Patent Office: Days
• US Class Current: 422/400
• CPC Class Codes: B01L 9/52 Supports specially adapted for flat sample carriers, e.g. for plates, slides, chips
• CPC Class Codes: G01N 2021/8488 the band presenting reference patches
• CPC Class Codes: G01N 31/22 using chemical indicators G01N31/02 takes precedence
• CPC Class Codes: G01N 33/18 Water
• CPC Class Codes: G01N 35/00009 provided with a sample supporting tape, e.g. with absorbent zones
• CPC Class Codes: Y10T 436/110833 Utilizing a moving indicator strip or tape

Abstract

A continuous indicator strip having a multiplicity of separate individual sequential test sections along the surface thereof, wherein a plurality of test sections are impregnated with the same indicator enabling the utilization of the strip for sequential repetitive testing of samples, the strip being provided with at least 20 such test sections.

Claims

1-9. -9. (canceled)

10. A device for automated monitoring of the chemical characteristics of a body of water, said device comprising a housing containing:

a) a continuous indicator strip having a multiplicity of separate individual sequential test sections along the surface thereof, wherein a plurality of said test sections are impregnated with the same indicator enabling the utilization of said strip for sequential repetitive testing of samples, said strip being provided with at least 20 such test sections in combination with a dispenser for holding and feeding said strip;

b) a take-up spool electrically driven for drawing said strip from said dispenser;

c) a liquid feed outlet above the path of said strip ion combination with a solenoid-operated valve for sequentially dispensing drops of sample liquid from said body of water onto said indicator strip;

d) an electro-optical sensor positioned to detect color changes in said test sections occurring as a result of contact with a drop of said sample liquid;

e) a controller unit connected to said sensor for noting and recording said changes, and

f) a fluid circuit having an inlet positioned with the water of said body of water, a minor outlet connected to an inlet of said solenoid-operated valve, a major outlet, and pumping means to circulate said liquid in said circuit.

11. A dispenser for use in a device according to claim 10, containing a plurality of continuous indicator strips each having a multiplicity of separate individual sequential test sections along the surface thereof, wherein a plurality of said test sections are impregnated with the same indicator enabling the utilization of said strip for sequential repetitive testing of samples, said strip being provided with at least 20 such test sections, and adapted to simultaneously hold and feed said plurality of strips adjacent to each other in a path below said liquid feed outlet in order to enable the utilization of said plurality of strips for sequential repetitive testing for various chemicals contained in a plurality of drops simultaneously delivered on each of said plurality of adjacent strips.

12. A device according to claim 10, wherein said strip is provided with at least 20 such test sections, wherein a plurality of columns of said test sections are provided side by side, each column being impregnated with a different indicator enabling the utilization of said strip for sequential repetitive testing for various chemicals contained in a plurality of samples delivered at each of said test sections.