Electronic device for analyzing aqueous solutions

• US 8,703,057 B2
• Filed: 01/15/2007
• Issued: 04/22/2014
• Est. Priority Date: 08/08/2006
• Status: Active Grant

• Current Assignee: Hach Company (Veralto Corp.)
• Original Assignee: Hach Company (Veralto Corp.)
• Inventors: Morris, David Alexander Nathaniel, Swanson, Teresa Lynn
• Primary Examiner(s): Jarrett, Lore
• Application Number:
  US11/623,199
• Publication Number:
  US 20080034845A1
• Time in Patent Office: 2,654 Days
• Field of Search: 422/68.1
• US Class Current: 422/68.1
• CPC Class Codes: G01N 21/77 by observing the effect on a chemical indicator
• CPC Class Codes: G01N 21/78 producing a change of colour
• CPC Class Codes: G01N 31/00 Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
• CPC Class Codes: G01N 31/22 using chemical indicators G01N31/02 takes precedence
• CPC Class Codes: G01N 33/18 Water

Abstract

An electronic device for analyzing an aqueous solution may comprise a housing, one or more measurement circuits and a control circuit all arranged inside the housing. The housing may be configured to receive a test element. The one or more measurement circuits may be configured to produce one or more corresponding sets of measurement signals relating to an aqueous solution received on the test element. The control circuit may include a memory having instructions stored therein that are executable by the control circuit to process the one or more sets of measurement signals to determine one or more corresponding characteristics of the aqueous solution.

Claims

1. A device for analyzing aqueous solutions, comprising:

a portable hand-held housing;

a test element for testing a plurality of different chemical characteristics of an aqueous solution, the test element comprising a plurality of test pads, and each test pad is associated with and responsive to a respective different chemical characteristic of an aqueous solution received on the test pads, and the plurality of test pads are attached to one side of a substrate that does not transmit light;

a radiation-transmissive test element placement member attached to an underside of the housing in juxtaposition with a slot of the housing an receiving the test element against its radiation-transmissive exterior surface, the aqueous solution separated from an interior of the housing, by the test element placement member and housing;

a test element receiving port formed in the housing comprising the test element placement member and the slot whereby the test element receiving port receives the test element, onto the test element placement member within the slot, with the substrate that does not transmit light entirely uniformly covering the plurality of test pads within the slot;

a plurality of measurement circuits arranged inside the housing and configured to produce a corresponding plurality of measurement signals indicative of the chemical characteristic associated with each respective test pad and relating to the aqueous solution received on the test element when the test element is placed onto the test element placement member;

a control circuit arranged inside the housing for executing instructions to process each of the plurality of measurement signals to determine the corresponding plurality of different characteristics of the aqueous solution including the chemical characteristic associated with each respective test pad; and

,

a display on the housing providing an indication of the determined plurality of characteristics.

2. The device of claim 1, wherein the substrate is black.

3. The device of claim 1, further comprising:

the measurement circuits comprising color detection circuitry operative to interrogate the test element by directing light through the test element placement member onto each of the respective test pads When the test element is disposed in the test element receiving port and by receiving color-responsive reflected light from each of the respective test pads back through the test element placement member; and

the control circuit determining the respective plurality of characteristics in response to the color-responsive reflected light from each respective test pad.

4. The device of claim 3, wherein;

the test element comprises three test pads attached to the substrate, including a first test pad color responsive to a chlorine value, a second test pad color responsive to a pH value and a third test pad color responsive to an alkalinity value of the aqueous solution;

the measurement circuits and control circuit cooperating to determine each of the chlorine value, the pH value and the alkalinity value of the aqueous solution when the test element is disposed in the test element receiving port; and

the display providing an indication of each of the chlorine value, the pH value and the alkalinity value of the aqueous solution upon interrogation of the test element.

5. A testing system for testing a chemical characteristic of an aqueous solution, the system comprising:

a test element for testing a plurality of different characteristics of an aqueous solution comprising a plurality of test pads, on substrate and each test pad responsive in color to a respective different characteristic of an aqueous solution wetting the test pads;

a portable, hand-held housing;

a radiation-transmissive test element receiving port on the housing that is configured to receive and support the test element on the housing wherein the test element receiving port comprises a radiation-transmissive test element placement member;

circuitry in the housing for generating radiation for interrogating more than one of the test pads, for receiving radiation reflected from the pads, and for generating a display responsive to the reflected radiation and indicative of the respective characteristics of the aqueous solution associated with each interrogated test pad, when the test element is disposed within the test element receiving port;

wherein the test element receiving port is proximate portions of the circuitry generating the radiation and receiving the reflected radiation; and

,

wherein the substrate of the test element does not transmit light and entirely uniformly covers all the test pads when the test pad is disposed on the test element placement member within the test element receiving port.

6. The system of claim 5, wherein the substrate comprises a black material.