Water measuring system with improved calibration

• US 5,233,860 A
• Filed: 12/27/1991
• Issued: 08/10/1993
• Est. Priority Date: 12/30/1990
• Status: Expired due to Term

• Current Assignee: Horiba Limited, Ichinen Tasco Co., Ltd. (ICHINEN HOLDINGS CO., LTD.)
• Original Assignee: Horiba Limited, Ichinen Tasco Co., Ltd. (ICHINEN HOLDINGS CO., LTD.)
• Inventors: Kohno, Satoshi, Mori, Takeshi, Ohkawa, Hiromi
• Primary Examiner(s): Williams, Hezron E.
• Assistant Examiner(s): DOMBROSKE, GEORGE M
• Application Number:
  US07/815,279
• Time in Patent Office: 592 Days
• Field of Search: 436/8, 436/9, 73/19.01, 73/19.1, 73/16, 73/1 R
• US Class Current: 73/19.1
• CPC Class Codes: G01N 33/1886 using probes, e.g. submersible probes, buoys
• CPC Class Codes: Y10T 436/10 Composition for standardization, calibration, simulation, stabilization, preparation or preservation; processes of use in preparation for chemical testing

Abstract

A water measuring system for measuring different parameters of water having a compact configuration that can be easily calibrated is provided. A plurality of individual sensors, are mounted on the housing, including a dissolved oxygen measuring sensor that can be mounted at a position separate from the other sensors. A hood member can be mounted at the lower end of the housing member to protect the sensors. A container that is capable of holding a calibration liquid can be fitted onto the housing member to provide the liquid at a position that will only contact those sensors other than the oxygen measuring sensor during a single calibration procedure.

Claims

1. A water measurement apparatus for measuring different parameters of water comprising:

a housing;

a plurality of individual sensors mounted on the housing, including an oxygen measuring sensor, the oxygen measuring sensor being mounted at a position separate from the other sensors, and

means for enabling a calibration of the sensors other than the oxygen measuring sensor, including a container for providing a liquid at a position that will only contact the sensors other than the oxygen measuring sensor, wherein the container is configured to extend around the oxygen measuring sensor.

2. A water measurement apparatus as in claim 1 wherein the container is configured to exclude the oxygen measuring sensor from contacting the liquid.

3. A water measurement apparatus as in claim 1 wherein the container is cylindrical.

4. A water measurement apparatus as in claim 1 wherein the plurality of individual sensors other than the oxygen measuring sensor are mounted below the oxygen measuring sensor.

5. A water measurement apparatus as in claim 1 further including a cylindrical hood member extending below the individual sensors.

6. A water measurement apparatus as in claim 3 wherein the cylindrical container has an indented periphery configured so as to exclude the oxygen measuring sensor.

7. A water measurement apparatus as in claim 3 wherein the cylindrical container includes a central protruding tube configured so as to extend about the oxygen measuring sensor.

8. A water measurement apparatus as in claim 4 wherein said plurality of individual sensors includes a pH-measuring electrode, a conductivity cell, and a turbidity cell.

9. A water measuring apparatus as in claim 8 wherein the liquid for calibration is an aqueous solution of phthalate with a pH of 4.

10. In a water measurement system for measuring several parameters of water with a plurality of individual sensors mounted on a common housing, the improvement comprising:

a housing member mounting a plurality of individual sensors at a lower portion of the housing;

an oxygen measuring sensor mounted on the housing member at a position above each of the other sensors;

a calibrating liquid capable of calibrating the individual sensors mounted below the oxygen sensor, and

a container configured to interface with the housing member and holding the calibrating liquid in such a manner as to extend operatively about the individual sensors except for the oxygen sensor.

11. A water measurement apparatus as in claim 10 further including a cylindrical hood member extending below the individual sensors and the oxygen sensor.

12. A water measurement apparatus as in claim 10 wherein the container has an indented periphery of a configuration to exclude the oxygen measuring sensor to its outside.

13. A water measurement apparatus as in claim 10 wherein the container includes a central protruding tube configured so as to extend about the oxygen measuring sensor.

14. A water measurement apparatus as in claim 10 wherein said plurality of individual sensors includes a pH-measuring electrode, a conductivity cell, and a turbidity cell.

15. A water measuring apparatus as in claim 14 wherein the liquid for calibration is an aqueous solution of phthalate with a pH of 4.

16. In a water measurement system for measuring several parameters of water with a plurality of individual sensors mounted on a common housing, the improvement comprising:

a housing member mounting a plurality of individual sensors at a lower portion of the housing;

an oxygen measuring sensor mounted on the housing member at a position above each of the other sensors;

a hood member removably mounted to the housing member and extending downward from the housing member to encompass each of the individual sensors, and

a container configured to interface with the housing member and to extend within the hood member, the container is further configured to hold liquid within its central portion and to have a perimeter enveloping wall which excludes the oxygen measuring sensor, whereby, when a calibrating liquid is inserted within the container, it can operatively contact each of the individual sensors with the exception of the oxygen measuring sensor.

17. A water measurement system as in claim 16, wherein said plurality of individual sensors includes a pH-measuring electrode, a reference electrode, a conductivity cell, and a turbidity cell.

18. A water measurement system as in claim 17, wherein the hood member and the container have an indented configuration aligned with the oxygen measuring sensor.

19. A water measurement system as in claim 18, further including an aqueous solution of phthalate as a calibration liquid.