Multi-probed sonde including microprocessor

• US 5,235,526 A
• Filed: 11/27/1990
• Issued: 08/10/1993
• Est. Priority Date: 11/27/1990
• Status: Expired due to Fees

• Current Assignee: Solomat Ltd (Koninklijke Philips N.V.)
• Original Assignee: Solomat Ltd (Koninklijke Philips N.V.)
• Inventors: Saffell, John R.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): ZANELLI, MICHAEL J
• Application Number:
  US07/619,288
• Time in Patent Office: 987 Days
• Field of Search: 364/556, 364/550, 364/551.01, 364/573, 364/480, 364/481, 364/571.01, 73/1 R, 324/73,1, 324/115, 324/132
• US Class Current: 700/282
• CPC Class Codes: G01N 27/403 Cells and electrode assemblies

Abstract

A sonde is provided which includes a plurality of discrete sensing electrodes of analog output projecting from a housing within which are accommodated a micro-processor and an analog-digital converter to digitize the output of the electrodes. A stirrer is fully integrated into the housing and projects from the housing centrally with the electrodes around it. The stirrer motor and the stirrer control are integrated into the housing. The micro-processor controls the stirrer control. The sonde also has a readily attachable and detachable calibration cup with wells defined therein. Each well is designed to receive its own liquid. The calibration cup is designed such that all the electrodes can be calibrated simultaneously.

Claims

1. A multi-probed metering apparatus for measuring electrical magnitudes comprising:

(a) at least one sonde unit, wherein said sonde unit comprises;

(i) a plurality of pick-up means,

(ii) an analog/digital converter means,

(iii) a selector circuit for identifying each of said plurality of pick-up means with which said sonde unit is associated, said selector circuit interfaces said plurality of pick-up means with said analog/digital converter means,

(iv) primary digital signal processing circuit, said primary digital signal processing circuit being in bi-directional digital communication with said analog/digital converter means and in uni-directional digital communication with said selector circuit, and

(v) an improved fluid flow-maintaining means, said fluid flow-maintaining means comprising;

stirrer control, stirrer driving component, and propeller component interconnected with said stirrer driving component, said stirrer control being in uni-directional digital communication with said sonde unit primary digital signal processing and with said stirrer driving component; and

(b) a central processing unit, wherein said central processing unit comprises;

(i) a power supply for said central processing unit and said sonde unit,

(ii) a real-time clock means,

(iii) a random access memory storage unit means for handling at least 500 bytes of information,

(iv) an arithmetic and logic unit means for making multi-pass linearization mathematical computations,

(v) a digital output means,

(vi) a secondary digital signal processing circuit supplying a digital output, said secondary digital signal processing circuit being in bi-directional digital communication with said sonde unit primary digital signal processing circuit, said real-time clock means, said random access memory storage unit means, said arithmetic and logic unit means, and said digital output means, and

(vii) means for processing said digital output from said secondary signal processing circuit.

2. A multi-probed metering apparatus as in claim 1 wherein said stirrer control controls said stirrer driving component to perform at least one of the following functions:

(a) the direction that said propeller means will rotate,

(b) the revolutions per minute which said propeller means will rotate, and/or

(c) intermittent rotating of said propeller means.

3. A multi-probed metering apparatus as in claim 1,

(a) wherein said stirrer driving component comprises:

(i) magnet means, said magnet means having at least one planar surface,

(ii) rotating means for turning said magnet means in a clockwise or counterclockwise direction, and

(iii) shaft means, said shaft means longitudinal axis being generally perpendicular to said magnet means at least one planar surface, and said shaft means interconnecting said magnet means and said rotating means, and

(b) wherein said propeller component comprises;

(i) propeller means for creating a fluid flow,

(ii) magnet means, said propeller component magnet means having at least one planar surface, and

(iii) shaft means, said propeller component shaft means longitudinal axis being generally perpendicular to said propeller component magnet means at least one planar surface, and said propeller component shaft means interconnecting said propeller component magnet means and said propeller means,

said stirrer driving component magnet means planar surface being in alignment with, but spaced apart from, said propeller component magnet means planar surface, and said stirrer driving component magnet means being magnetically interconnected with said propeller component magnet means.

4. A multi-probed metering apparatus as in claim 1, further comprising a means for calibrating said pick-up means, wherein said calibration means comprises a polyhedrally-shaped calibration cup body having at least two parallel planar surfaces, said calibration body defines a plurality of vertically-oriented calibration wells which, while passing through one of said at least two parallel planar surfaces, do not pass through the opposing parallel planar surface, the configuration of the openings in the calibration cup body parallel planar surface through which the calibration wells pass corresponds with the configuration of said plurality of pick-up means in said sonde unit, and said calibration wells being dimensioned such that, when said plurality of pick-up means are introduced therein, the outside wall surfaces of said pick-up means within said calibration wells are spaced apart from said calibration cup body inside wall surfaces defined by said calibration wells.

5. A multi-probed metering apparatus as in claim 4 further comprising a means for measuring the amount of calibration fluid which should be introduced therein.

6. A multi-probed metering apparatus as in claim 4 further comprising a means for preventing cross-contamination of one of said plurality of pick-up means by a calibration solution of another of said plurality of pick-up means.

7. A multi-probed metering apparatus as in claim 4 further comprising a means for fluidly interconnecting a plurality of said calibration wells together.

8. A multi-probed metering apparatus as in claim 4 further defining a well configured and dimensioned to accept said fluid-flow maintaining means.

9. A multi-probed metering apparatus as in claim 1 wherein at least one of said plurality of pick-up means comprises:

(a) a monitoring end portion,

(b) a signal transmitting end portion, said signal transmitting end portion comprising a means for interconnecting said pick-up means to said sonde unit, and

(c) sealing means located between said monitoring end portion and said signal transmitting end portion, said sealing means being dimensioned to prevent the flow of fluid between said pick-up means monitoring end portion and said pick-up means signal transmitting end portion.

10. A multi-probed metering apparatus as in claim 9 wherein said at least one of said plurality of pick-up means further comprises means for securing said at least one of said plurality of pick-up means to said sonde unit, said securing means being positioned between said pick-up means monitoring end portion and said sealing means.

11. A multi-probed metering apparatus for measuring electrical magnitudes comprising:

(a) at least one sonde unit, wherein said sonde unit comprises;

(i) a plurality of pick-up means,

(ii) an analog/digital converter means,

(iii) a selector circuit for identifying each of said plurality of pick-up means with which said sonde unit is associated, said selector circuit interfaces said plurality of pick-up means with said analog/digital converter means,

(iv) primary digital signal processing circuit, said primary digital signal processing circuit being in bi-directional digital communication with said analog/digital converter means and in uni-directional digital communication with said selector circuit, and

(v) an address selector which identifies said at least one sonde, said address selector being in uni-directional digital communication with said sonde unit primary digital signal processing circuit; and

(b) a central processing unit, wherein said central processing unit comprises;

(i) a power supply for said central processing unit and said sonde unit,

(ii) a real-time clock means,

(iii) a random access memory storage unit means for handling at least 500 bytes of information,

(iv) an arithmetic and logic unit means for making multi-pass linearization mathematical computations,

(v) a digital output means,

(vi) a secondary digital signal processing circuit supplying a digital output, said secondary digital signal processing circuit being in bi-directional digital communication with said sonde unit primary digital signal processing circuit, said real-time clock means, said random access memory storage unit means, said arithmetic and logic unit means, and said digital output means, and

(vii) means for processing said digital output from said secondary signal processing circuit.

12. A multi-probed metering apparatus as in claim 11 comprising at least a second sonde unit, wherein said second sonde unit comprises:

(a) a plurality of pick-up means,

(b) an analog/digital converter means,

(c) a selector circuit for identifying each of said plurality of second sonde unit pick-up means with which said second sonde unit is associated, said second sonde unit selector circuit interfaces said second sonde unit plurality of pick-up means with said second sonde unit analog/digital converter means,

(d) an address selector for identifying said second sonde unit, and

(e) primary digital signal processing circuit, said second sonde unit primary digital processing circuit being in bi-directional digital communication with said second sonde unit analog/digital converter means and with said central processing unit secondary digital signal processing circuit, and in uni-directional digital communication with said second sonde unit selector circuit and said second sonde unit address selector.

13. A multi-probed metering apparatus as in claim 12 wherein said second sonde unit further comprises an improved fluid flow-maintaining means integrated into said second sonde unit, said fluid flow-maintaining means comprising:

(a) stirrer control,

(b) stirrer driving component, and

(c) propeller component fixedly attached to said stirrer driving component, said stirrer control being in uni-directional digital communication with said second sonde unit primary digital signal processing circuit and with said stirrer driving component.

14. A multi-probed metering apparatus as in claim 12 wherein said digital output means is selected from the group consisting of light emitting diode (LED) display, liquid crystal diode (LCD) display, external computer and/or monitoring sources, a digital/analog converter means, and any combination thereof.

15. A multi-probed metering apparatus as in claim 12 wherein said central processing unit random access memory storage unit has the capability of handling between 500 and 5,000,000 bytes of information.

16. A multi-probed metering apparatus as in claim 11 wherein at least one of said plurality of pick-up means comprises:

(a) a monitoring end portion,

(b) a signal transmitting end portion, said signal transmitting end portion comprising a means for interconnecting said pick-up means to said sonde unit, and

(c) sealing means located between said monitoring end portion and said signal transmitting end portion, said sealing means being dimensioned to prevent the flow of fluid between said pick-up means monitoring end portion and said pick-up means signal transmitting end portion.

18. A multi-probed metering apparatus as in claim 11, further comprising a means for calibrating said pick-up means, wherein said calibration means comprises a polyhedrally-shaped calibration cup body having at least two parallel planar surfaces, said calibration cup body defines a plurality of vertically-oriented calibration wells which, while passing through one of said at least two parallel planar surfaces, do not pass through the opposing parallel planar surface, the configuration of the openings in the calibration cup body parallel planar surface through which the calibration wells pass corresponds with the configuration of said plurality of pick-up means in said sonde unit, and said calibration wells being dimensioned such that, when said plurality of pick-up means are introduced therein, the outside wall surfaces of said pick-up means within said calibration wells are spaced apart from said calibration cup body inside wall surfaces defined by said calibration wells.

19. A multi-probed metering apparatus as in claim 18 further comprising a means for measuring the amount of calibration fluid which should be introduced therein.

20. A multi-probed metering apparatus in accordance with claim 18 further comprising a means for preventing cross-contamination of one of said plurality of pick-up means by a calibration solution of another of said plurality of pick-up means.

21. A multi-probed metering apparatus as in claim 18 further comprising a means for fluidly interconnecting a plurality of said calibration wells together.

22. A multi-probed metering apparatus as in claim 18 further defining a well configured and dimensioned to accept a fluid-flow maintaining means integrated into said sonde unit.

17. A multi-probed metering apparatus as in 16 wherein said at least one of said plurality of pick-up means further comprises means for securing said at least one of said plurality of pick-up means to said sonde unit, said securing means being positioned between said pick-up means monitoring end portion and said sealing means.

23. A sonde comprising a housing, a plurality of discrete sensing electrodes of analog output attached to said housing for sensing a corresponding plurality of parameters to be measured, means for selectably activating each said electrode, said housing comprises:

(a) a built-in, integral stirrer unit, said stirrer unit consisting of;

(i) a liquid agitator portion mounted externally of the housing adjacent the active portions of said electrodes,

(ii) an entirely internal agitator drive means, and

(iii) an entirely internal agitator drive control means;

(b) a built-in integral microprocessor;

(c) an entirely internal analog-digital converter means for digitizing the analog output generated by said electrodes and passing said digitized output to said microprocessor; and

(d) output porting connected to receive said digitized output, said agitator drive control means being electrically controlled by said microprocessor.

24. A sonde as recited in claim 23 wherein one end of each said electrode is mounted in a seat in said housing, said seat and the adjacent said one end of said electrode each being formed with co-operable quick-release coupling means for the ready attachment and release therebetween, and wherein each said electrode having a sealing means for preventing the ingress of liquid to said seat.

25. A sonde as recited in claim 23 wherein said drive means comprises:

(a) a motor having a rotatable magnet with at least one planar surface;

(b) a motor shaft having a longitudinal axis generally perpendicular to said motor magnet at least one planar surface;

(c) a rotary agitator shaft; and

(d) a rotatable agitator magnet having at least one planar surface,

wherein the longitudinal axis of said agitator shaft is generally perpendicular to said agitator magnet planar surface, and wherein said motor magnet planar surface is in spaced apart alignment with, but magnetically interconnectable to, said agitator magnet planar surface.

26. A sonde as recited in claim 23 further comprising a calibration cup in attachable and detachable configuration with said housing, said cup defining a plurality of calibration wells designed to receive and encompass the lower portion of each said sensing electrode, wherein each said well is provided with fluid identification indicia, and wherein each said well is designed to prevent undesired overflow of liquid from one well into another.

27. A sonde comprising a housing, a plurality of discrete sensing electrodes of analog output attached to said housing for sensing a corresponding plurality of parameters to be measured, and means for selectably activating each said electrode,

wherein said electrodes have connected thereto an analog/digital converter which is effective to digitize the analog output signal from each electrode,

wherein said housing comprises a digital signal processor for controlling said means for selectably activating each electrode,

wherein said housing comprises an output means,

wherein said digital signal processor is connected for bi-directional digital communication with said analog/digital converter and with said output means,

wherein said sonde is adapted for bi-directional digital communication through said output means with a discrete apparatus which is effective to process, store and/or display digital data derived from sensing electrodes of at least one other sonde,

wherein a stirrer is attached to said housing,

wherein means for rotating said stirrer is located substantially wholly within said housing, and

wherein said stirrer drive control means is located substantially wholly within said housing and electrically integrated with said digital signal processor.

28. A sonde as recited in to claim 27 wherein said stirrer-rotating means comprises:

(a) a motor having a rotatable magnet with at least one planar surface;

(b) a motor shaft having a longitudinal axis generally perpendicular to said motor magnet at least one planar surface;

(c) a rotary stirrer shaft; and

(d) a rotatable stirrer magnet having at least one planar surface,

wherein the longitudinal axis of said stirrer shaft is generally perpendicular to said stirrer magnet planar surface, and wherein said motor magnet planar surface is in spaced apart alignment with, but magnetically interconnected to, said stirrer magnet planar surface.

29. A sonde as recited in claim 27 further comprising an address selector which identifies said sonde, said address selector being in uni-directional digital communication with said digital signal processor.

30. A sonde comprising a housing, a plurality of discrete electrodes of analog output attached to said housing for sensing a corresponding plurality of parameters to be measured, and means for selectably activating each said electrode, said housing comprising a calibration cup in attachable and detachable configuration with said housing, wherein said calibration cup defines a plurality of calibration wells designed to receive and encompass the lower portion of said sensing electrode, wherein each said well is provided with liquid identification indicia, and wherein each said well is designed to prevent undesired overflow of liquid from one well into another.

31. A sonde comprising a housing, a plurality of discrete sensing electrodes of analog output attached to said housing for sensing a corresponding plurality of parameters to be measured, and means for selectably activating each said electrode, said housing comprises:

(a) a built-in, integral stirrer unit, wherein said unit consists of;

(i) a liquid agitator portion mounted externally of said housing and adjacent the active portions of said electrodes;

(ii) an entirely internal agitator drive means, and

(iii) an entirely internal agitator drive control means;

(b) a built-in, integral microprocessor;

(c) an entirely internal analog-digital converter means for digitizing the analog output generated by said electrodes and passing said digitized output to said microprocessor; and

(d) output porting connected to receive said digitized output,

wherein said agitator drive control means is electrically controlled by said microprocessor, wherein one end of each said electrode is mounted in a seat in said housing, said seat and the adjacent said one end of said electrode each being formed with co-operable quick-release coupling means for the ready attachment and release therebetween, and wherein each said electrode having a sealing means for preventing the ingress of liquid into said seat.