HAND-HELD SYSTEMS AND METHODS FOR DETECTION OF CONTAMINANTS IN A LIQUID

• US 20090210169A1
• Filed: 02/15/2008
• Published: 08/20/2009
• Est. Priority Date: 02/15/2008
• Status: Abandoned Application

• Current Assignee: Ge-Hitachi Nuclear Energy Americas LLC (GE Aerospace)
• Original Assignee: Ge-Hitachi Nuclear Energy Americas LLC (GE Aerospace)
• Inventors: Spears, Brian Forrest, Potyrailo, Radislav Alexandrovich, Monk, David James
• Application Number:
  US12/032,196
• Publication Number:
  US 20090210169A1
• Time in Patent Office: Days
• US Class Current: 702/25
• CPC Class Codes: G01N 27/06 of a liquid involving electrolysis G01N27/26
• CPC Class Codes: G01N 27/333 Ion-selective electrodes or membranes glass electrodes G01N27/36
• CPC Class Codes: G01N 33/1846 Total carbon analysis
• CPC Class Codes: G01N 33/1886 using probes, e.g. submersible probes, buoys

Abstract

A method for detecting contaminants in a liquid is provided. The method can include filling at least a portion of a sample container interior chamber with a liquid sample and submerging a sensor probe of a hand-held portable sensing device in a liquid sample. The method can additionally include sensing an electrical conductivity of the liquid sample utilizing at least one conductivity sensor and automatically selecting a particular one of a plurality of contaminant concentration detection (CCD) algorithms based on the sensed conductivity. The method can further include setting a sensitivity of at least one ionic species sensor to a sensitivity level particular to the selected CCD algorithm and sensing non-desired contaminants in the liquid sample utilizing the at least one ionic species sensor. A concentration of the non-desired contaminant in the liquid sample is then determined in accordance with the selected CCD algorithm.

Claims

1. A method for detecting contaminants in a liquid, said method comprising:

filling at least a portion of a sample container interior chamber with a liquid sample;

submerging a sensor probe of a hand-held portable sensing device in a liquid sample;

sensing an electrical conductivity of the liquid sample utilizing at least one conductivity sensor attached to the submerged sensor probe of the hand-held portable sensing device and electrically connected to a controller of the hand-held portable sensing device;

automatically selecting, based on the sensed conductivity, a particular one of a plurality of contaminant concentration detection (CCD) algorithms stored on the memory device of the hand-held portable sensing device;

setting a sensitivity of at least one ionic species sensor to a sensitivity level particular to the selected CCD algorithm, each CCD algorithm configured to implement a particular sensitivity setting associated with the respective CCD algorithm, the at least one ionic species sensor attached to the submerged sensor probe of the hand-held portable sensing device and electrically connected to the controller of the hand-held portable sensing device;

sensing non-desired contaminants in the liquid sample utilizing the at least one ionic species sensor set to the particular sensitivity level; and

determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm.

2. The method of claim 1, wherein determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm comprises:

sensing a temperature of the liquid sample utilizing a temperature sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller; and

determining the concentration of the non-desirable contaminant utilizing the sensed temperature of the liquid sample.

3. The method of claim 2 further comprising displaying at least one of the sensed electrical conductivity of the liquid sample, the temperature of the liquid sample and the concentration of the non-desired contaminant in the liquid sample utilizing a display included in a head of the hand-held portable sensing device and electrically connected to the controller.

4. The method of claim 1, wherein determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm comprises:

sensing a temperature of the liquid sample utilizing a temperature sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

maintaining the liquid sample at a substantially constant temperature over a period of time utilizing the temperature sensor and a thermal electric heating and cooling device attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

acquiring multiple non-desired contaminants readings over the period utilizing the at least one ionic species sensor; and

determining the concentration of the non-desirable contaminant utilizing multiple contaminant readings.

5. The method of claim 1, wherein determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm comprises:

sensing a temperature of the liquid sample utilizing a temperature sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

cycling the temperature of the liquid sample between two or more temperatures over a period of time utilizing the temperature sensor and a thermal electric heating and cooling device attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

acquiring multiple non-desired contaminant readings over the period utilizing the at least one ionic species sensor; and

determining the concentration of the non-desirable contaminant utilizing multiple contaminant readings.

6. The method of claim 1, wherein determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm comprises:

sensing an amount of organic carbon in the liquid sample utilizing an organic carbon sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller; and

determining the concentration of the non-desirable contaminant utilizing the amount of sensed organic carbon in the liquid sample.

7. The method of claim 1 further comprising utilizing a stored power device included in a head of the hand-held portable sensing device to provide electrical power to:

the controller,

the at least one conductivity sensor,

the at least one ionic species sensor, and

at least one of a temperature sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller, a display included in a head of the hand-held portable sensing device and electrically connected to the controller, and a thermal electric heating and cooling device attached to the sensor probe of the hand-held portable sensing device electrically connected to the controller.

8. The method of claim 7 further comprising executing a power saving subroutine of the selected CCD algorithm to control consumption of power from the stored power device by the controller, the at least one conductivity sensor, the at least one ionic species sensor, the temperature sensor, the thermal electric heating and cooling device, and the display during use of the hand-held portable sensing device.

9. The method of claim 1, wherein the at least one ionic species sensor comprising a plurality of ionic species sensors forming an array of ionic species sensors attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller, each ionic species sensor independently sensing respective independent values of the non-desired contaminant in the liquid sample, and

wherein determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm comprises implementing multivariate analysis to determine the concentration of the non-desirable contaminant.

10. The method of claim 1, wherein the sample container comprises an air-tight container having the interior chamber under a vacuum, and filling at least a portion of the sample container interior chamber with a liquid sample comprises:

coupling the hand-held portable sensing device in an air-tight fashion to a first end of the air-tight container having the at least one conductivity sensor and the at least one ionic species sensor positioned within the interior chamber of the container;

exposing a tubular stem at an opposing second end of the air-tight container to a liquid to be sampled; and

breaking an air-tight seal within the tubular stem such that the liquid sample is drawn into the interior chamber of the container, thereby preventing exposure of the liquid sample to ambient impurities and preserving the integrity of the liquid sample.

11. The method of claim 1, wherein the sample container comprises an air-tight piston and cylinder, and filling at least a portion of the sample container interior chamber with a liquid sample comprises:

coupling the hand-held portable sensing device including the at least one conductivity sensor and the at least one ionic species sensor to the base of the piston placed within the cylinder;

exposing a tubular stem at an opposing end of the air-tight cylinder to the liquid to be sampled;

withdrawing the piston to a desired position to create a vacuum in the cylinder such that the liquid sample is drawn through the tubular stem into the cylinder such that the sensors come in contact with the liquid sample, thereby preventing exposure of the liquid sample to ambient impurities, preserving the integrity of the liquid sample, and ensuring a precise volume is retained.

12. The method of claim 1, wherein the container comprises a microwell having the at least one conductivity sensor and at least one ionic species sensor arranged on a bottom of the microwell, and wherein filling at least a portion of a sample container interior chamber with a liquid sample is performed substantially simultaneously with submerging a sensor probe of a hand-held portable sensing device in a liquid sample.

13. The method of claim 1, wherein determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm comprises:

sensing a temperature of the liquid sample utilizing a temperature sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

sensing an organic carbon concentration of the liquid sample utilizing an organic carbon sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller; and

determining the concentration of the non-desirable contaminant taking into account the information from the sensed temperature and organic carbon level of the liquid sample.

14. The method of claim 1, further comprising:

utilizing the determined concentrations of the non-desired contaminants during execution of the selected CCD algorithm to estimate the conductivity of the liquid sample;

comparing the estimated conductivity to the sensed conductivity; and

generating an error alert, indicating that a possible error has occurred, when a differential between the estimated conductivity and the sensed conductivity is greater than a specific value.

15. A hand-held, portable system for detection of contaminants in a liquid, said system comprising:

a sample container for retaining a liquid sample; and

a hand-held portable sensing device at least partially submersible into the liquid sample and operable for determining a concentration of a non-desired contaminant in the liquid sample, the hand-held portable sensing comprising;

at least one conductivity sensor for sensing an electrical conductivity of the liquid sample,

at least one ionic species sensor for sensing the non-desired contaminant in the liquid sample, and

a controller electrically connected to the at least one conductivity sensor and the at least one ionic species sensor, the controller including;

a processor, and

a computer readable memory device having stored thereon a contaminant concentration detection (CCD) algorithm selection routine executable by the processor to determine an electrical conductivity value of the liquid sample and, based on the determined conductivity value, instruct the processor to execute a particular one of a plurality of CCD algorithms stored on the memory device, each respective CCD algorithm configured to determine a concentration of the non-desired contaminant in the liquid sample using a respective different sensitivity setting for the at least one ionic species sensor.

16. The system of claim 15, wherein the hand-held portable sensing device further comprises a temperature sensor electrically connected to the controller for sensing a temperature of the liquid sample and each of the CCD algorithms are configured to determine the concentration of the non-desirable contaminant utilizing a sensed temperature of the liquid sample.

17. The system of claim 16, wherein the hand-held portable sensing device further comprises a thermal electric heating and cooling device electrically connected to the controller for heating and cooling the liquid sample and each of the CCD algorithms are configured to utilize the thermal electric heating and cooling device to maintain the liquid sample at a substantially constant temperature over a period of time and take multiple contaminant readings over the period to determine the concentration of the non-desirable contaminant utilizing the multiple contaminant readings.

18. The system of claim 16, wherein the hand-held portable sensing device further comprises a thermal electric heating and cooling device electrically connected to the controller for heating and cooling the liquid sample and each of the CCD algorithms are configured to utilize the thermal electric heating and cooling device to cycle the temperature of the liquid sample between two or more temperatures over a period of time and take multiple contaminant readings at the different temperatures over the period to determine the concentration of the non-desirable contaminant utilizing the multiple contaminant readings.

19. The system of claim 16, wherein the hand-held portable sensing device further comprises a display electrically connected to the controller for displaying at least one of the sensed electrical conductivity of the liquid sample, the temperature of the liquid sample and the concentration of the non-desired contaminant in the liquid sample.

20. The system of claim 15, wherein the hand-held portable sensing device further comprises an organic carbon sensor electrically connected to the controller for sensing an amount of organic carbon in the liquid sample and each of the CCD algorithms are configured to determine the concentration of the non-desirable contaminant utilizing a sensed amount of organic carbon in the liquid sample.

21. The system of claim 15, wherein the hand-held portable sensing device further comprises:

at least one of;

a display electrically connected to the controller for displaying at least one the sensed electrical conductivity of the liquid sample and the concentration of the non-desired contaminant in the liquid sample, and

a thermal electric heating and cooling device electrically connected to the controller for heating and cooling the liquid sample, and

a stored power device for providing electrical power to the controller, the display, the thermal electric heating device, the conductivity sensor and the ionic species sensor,

each of the CCD algorithms including a power saving subroutine for controlling power consumption by the controller, the sensors, thermal electric heating and cooling device and display during use of the hand-held portable sensing device.

22. The system of claim 15 comprising a ionic species sensor array including a plurality of ionic species sensors electrically connected to the controller, each ionic species sensor independently sensing a respective independent value of the non-desired contaminant in the liquid sample, and at least one of the CCD algorithms is configured to implement multivariate analysis to determine the concentration of the non-desirable contaminant.

23. The system of claim 15, wherein the sample container comprises an air-tight container coupleable at a first end to the hand-held portable sensing device in an air-tight fashion having the at least one conductivity sensor and the at least one ionic species sensor positioned within an interior chamber of the container, the interior chamber being under a vacuum, the container comprising a tubular stem and air-tight seal at an opposing second end such that when the stem is exposed to a liquid and the air-tight seal is broken, the liquid sample will be drawn into the interior chamber of the container to prevent exposure of the liquid sample to ambient impurities and preserve the integrity of the liquid sample.

24. The system of claim 15, wherein the sample container comprises an air-tight piston and cylinder, with the hand-held portable sensing device having the at least one conductivity sensor and the at least one ionic species sensor embedded in a base of the piston, the cylinder comprising a tubular stem for inserting into a volume of a liquid to be sampled, such that when the piston is withdrawn to a desired position a vacuum is created in the cylinder drawing the liquid through the tubular stem into the cylinder to provide the liquid sample, thereby preventing exposure of the liquid sample to ambient impurities, preserving the integrity of the liquid sample, and ensuring a precise volume is retained.

25. The system of claim 15, wherein the container comprises a microwell having the at least one conductivity sensor and at least one ionic species sensor arranged on a bottom of the microwell, and wherein the sensor probe is submerged into the liquid sample substantially simultaneously with filling at least a portion of a sample container interior chamber with a liquid sample.

26. The system of claim 15, wherein the selected CCD algorithm is further configured to:

sense a temperature of the liquid sample utilizing a temperature sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

sense an organic carbon concentration of the liquid sample utilizing an organic carbon sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller; and

determine the concentration of the non-desirable contaminant taking into account the information from the sensed temperature and organic carbon level of the liquid sample.

27. The system of claim 15, wherein the selected CCD algorithm is further configured to:

utilize the determined concentrations of the non-desired contaminants during to estimate the conductivity of the liquid sample;

compare the estimated conductivity to the sensed conductivity; and

generate an error alert, indicating that a possible error has occurred, when a differential between the estimated conductivity and the sensed conductivity is greater than a specific value.

28. A method for detecting contaminants in a liquid, said method comprising:

submerging a sensor probe of a hand-held portable sensing device in a liquid sample retained within a sample container;

sensing an electrical conductivity of the liquid sample utilizing a conductivity sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to a controller of the hand-held portable sensing device;

automatically selecting, based on the sensed conductivity, a particular one of a plurality of contaminant concentration detection (CCD) algorithms stored on the memory device of the hand-held portable sensing device;

setting a sensitivity of each of a plurality of sensors in an ionic species sensor array to a sensitivity level particular to the selected CCD algorithm, each CCD algorithm configured to implement a particular sensitivity setting associated with the respective CCD algorithm, the at least one ionic species sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller of the hand-held portable sensing device;

sensing a temperature of the liquid sample utilizing a temperature sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

sensing non-desired contaminants in the liquid sample utilizing ionic species sensor array having each sensor set to the particular sensitivity level; and

determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm utilizing non-desired contaminants readings from the ionic species sensor array and temperature readings from the temperature sensor.

29. The method of claim 28 further comprising displaying at least one of the sensed electrical conductivity of the liquid sample, the temperature of the liquid sample and the concentration of the non-desired contaminant in the liquid sample utilizing a display included in a head of the hand-held portable sensing device and electrically connected to the controller.

30. The method of claim 28, wherein determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm comprises:

sensing a temperature of the liquid sample utilizing a temperature sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

maintaining the liquid sample at a substantially constant temperature over a period of time utilizing the temperature sensor and a thermal electric heating and cooling device attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

acquiring multiple non-desired contaminant readings over the period utilizing the ionic species sensor array; and

determining the concentration of the non-desirable contaminant utilizing multiple contaminant readings.

31. The method of claim 28, wherein determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm comprises:

sensing a temperature of the liquid sample utilizing a temperature sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

cycling the temperature of the liquid sample between two or more temperatures over a period of time utilizing the temperature sensor and a thermal electric heating and cooling device attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller;

acquiring multiple non-desired contaminants readings over the period utilizing the ionic species sensor array; and

determining the concentration of the non-desirable contaminant utilizing multiple contaminant readings.

32. The method of claim 28, wherein determining a concentration of the non-desired contaminant in the liquid sample in accordance with the selected CCD algorithm comprises:

sensing an amount of organic carbon in the liquid sample utilizing an organic carbon sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller; and

determining the concentration of the non-desirable contaminant utilizing the amount of sensed organic carbon in the liquid sample.

33. The method of claim 28 further comprising utilizing a stored power device included in a head of the hand-held portable sensing device to provide electrical power to:

the controller, the conductivity sensor, the ionic species sensor array, and

at least one of a temperature sensor attached to the sensor probe of the hand-held portable sensing device and electrically connected to the controller, a display included in a head of the hand-held portable sensing device and electrically connected to the controller, and a thermal electric heating and cooling device attached to the sensor probe of the hand-held portable sensing device electrically connected to the controller.

34. The method of claim 33 further comprising executing a power saving subroutine of the selected CCD algorithm to control consumption of power from the stored power device by the controller, the at least one conductivity sensor, the at least one ionic species sensor, the temperature sensor, the thermal electric heating and cooling device, and the display during use of the hand-held portable sensing device.