Wireless MEMS sensing device

• US 6,936,160 B2
• Filed: 10/28/2002
• Issued: 08/30/2005
• Est. Priority Date: 10/28/2002
• Status: Expired due to Fees

• Current Assignee: PTI Technologies, Inc. (ESCO Technologies, Inc.)
• Original Assignee: PTI Technologies, Inc. (ESCO Technologies, Inc.)
• Inventors: Ellis, Rowland, Moscaritolo, Daniel
• Primary Examiner(s): Cecil, Terry K.
• Application Number:
  US10/281,834
• Publication Number:
  US 20040079686A1
• Time in Patent Office: 1,037 Days
• Field of Search: 340/539, 210/90, 210/85, 210/143, 738/665
• US Class Current: 210/85
• CPC Class Codes: B01D 29/603 by flow measuring
• CPC Class Codes: B01D 29/606 by pressure measuring
• CPC Class Codes: B01D 29/608 by temperature measuring
• CPC Class Codes: B01D 35/143 Filter condition indicators

Abstract

A sensor component that may be used in conjunction with a filter module may include a plurality of sensor packages. The latter, in turn, may incorporate one or more micro-electromechanical systems (MEMS) sensors to measure various characteristics of fluid flow and filtration. A single sensor component may be adapted to measure the pressure, temperature, flow rate, differential pressure, conductivity, viscosity, pH level, etc. of the fluid at an upstream and a downstream location. Sensor measurements may be obtained continuously in order to monitor and indicate fluid conditions, including the use of a warning mechanism to indicate an out-of-range condition when the measurements fall outside of pre-set limits. Depending on the application and the fluid being filtered, data, including measurement data, may be transmitted through electrical connections or wirelessly. In wireless configurations, a sleep-mode may be included to maximize the life of local power supplies.

Claims

1. A filter module for filtering a fluid, said filter module comprising:

a filter element having an end cap at an end thereof, said filter element receiving said fluid in an unfiltered state at an inlet side and producing said fluid in a filtered state at an outlet side;

a single-body sensor component coupled to said end cap, said sensor component having a single housing and at least a first sensor package and a second sensor package disposed within said housing, each said sensor package including a micro-electromechanical systems (MEMS) sensor, and each said sensor package being configured to measure at least one member selected from the group consisting of temperature, pressure, and flow rate; and

a transmitter coupled to said sensor component, said transmitter being configured to wirelessly transmit measurement data to a remote signal receiver,

wherein said filter element, said end cap, and said sensor component are adapted to be housed within a casing, and wherein said first sensor package is adapted to be in communication with said unfiltered fluid upstream of said filter element and said second sensor package is adapted to be in communication with said filtered fluid downstream of said filter element.

2. The filter module claim 1, wherein each said sensor package includes a MEMS pressure sensor.

3. The filter module of claim 1, wherein a differential pressure is calculated based on a pressure measurement taken by said first sensor package for the unfiltered fluid and a pressure measurement taken by said second sensor package for the filtered fluid.

4. The filter module of claim 1, wherein said measurement data is transmitted to a data processing device from said signal receiver.

5. The filter module of claim 1, wherein each of said first and second sensor packages is configured to communicate its respective measurements to a processor.

6. The filter module of claim 1, wherein said casing includes top and bottom ends and said signal receiver is coupled to the bottom end of said casing.

7. The filter module of claim 6, wherein the signal receiver is threadably coupled to said bottom end.

8. The filter module of claim 6, said signal receiver further including a warning mechanism configured to indicate an out-of-range condition of said fluid.

9. The filter module of claim 8, wherein said condition is determined based on measurement of one or more of said fluid'"'"'s pressure, temperature, flow rate, and differential pressure, and said warning mechanism includes a visual indicator.

10. The filter module of claim 1, further including a sleep-mode feature, wherein said first and second sensor packages and said signal receiver are configured to remain in an unactuated state in the absence of fluid flow, said first and second sensor packages becoming actuated once fluid flow is initiated, and said signal receiver becoming actuated upon receipt of said measurement data.

11. The filter module of claim 1, wherein said measurement data are transmitted to said signal receiver as ultra-sonic signals.

12. The filter module of claim 1, wherein said measurement data are transmitted to said receiver in real time.

13. The filter module of claim 1, said sensor component further comprising a third sensor package having a MEMS sensor, wherein said third sensor package is in contact with the unfiltered fluid and is configured to measure at least one member selected from the group consisting of a conductivity, a pH level, and a viscosity of said unfiltered fluid.

14. The filter module of claim 13, wherein said third sensor package is configured to communicate its measurements to a processor.

15. The filter module of claim 1, wherein at least one of the sensor packages includes redundant MEMS sensors.

16. The filter module of claim 1, wherein said sensor component includes a redundant sensor package.

17. A filter module for filtering a fluid, said filter module comprising:

a filter element having an end cap at an end thereof, said filter element receiving said fluid in an unfiltered state upstream of the filter element and producing said fluid in a filtered state downstream of the filter element;

a single-body sensor component coupled to said end cap through a sensor port defined therethrough, said sensor component having a single housing and a first pressure sensor and a second pressure sensor disposed within said housing, wherein said first pressure sensor is adapted to be in communication with said unfiltered fluid and said second pressure sensor is adapted to be in communication with said filtered fluid so as to enable calculation of a differential pressure based on respective measurements of said first and second pressure sensors;

a casing having top and bottom ends, said casing configured to house therein said filter element, said end cap, and said sensor component;

a signal receiver coupled to said bottom end of said casing; and

a transmitter coupled to said sensor component, wherein said transmitter is configured to wirelessly transmit measurement data from said first and second pressure sensors to said signal receiver, wherein said first and second pressure sensors are micro-electromechanical systems (MEMS) sensors.

18. The filter module of claim 17, wherein said measurement data are transmitted to said signal receiver in real time.

19. The filter module of claim 17, further including a retaining brace configured to be removably coupled to said end cap, said brace retaining the sensor component within said sensor port.

20. The filter module of claim 19, wherein said brace is coupled to said end cap with a connection means.

21. The filter module of claim 19, wherein the sensor component is configured to be retained within said sensor port by a plurality of overlapping braces.

22. The filter module of claim 17, said sensor-component housing being further configured to receive a power supply and electronics thereon.

23. The filter module of claim 22, wherein said sensor-component housing further includes a sealing member around the periphery thereof, said sealing member being configured to provide a fluid-tight interface between said sensor-component housing and said sensor port.

24. The filter module of claim 22, wherein said power supply includes a battery.

25. The filter module of claim 24, wherein said battery is rechargeable.

26. The filter module of claim 17, wherein said signal receiver is threadably coupled to said bottom end of said casing.

27. The filter module of claim 17, wherein said signal receiver includes a power supply and electronics, configured to be locked in place within a receiver housing.

28. The filter module of claim 27, wherein said power supply includes a rechargeable battery.

29. The filter module of claim 17, further including a sleep-mode feature, wherein said first and second pressure sensors and said signal receiver are configured to remain in an unactuated state in the absence of fluid flow, said first and second pressure sensors becoming actuated once fluid flow is initiated, and said signal receiver becoming actuated upon receipt of said measurement data.

30. A filter module for filtering a fluid, said filter module comprising:

a filter element having an end cap at an end thereof, said filter element receiving said fluid in an unfiltered state at an inlet side upstream of the filter element and producing said fluid in a filtered state at an outlet side downstream of the filter element;

a single-body sensor component coupled to said end cap through a sensor port defined therethrough, said sensor component having a single housing, a first sensor package that is adapted to be in communication with said unfiltered fluid and a second sensor package that is adapted to be in communication with said filtered fluid, said first sensor package including a first micro-electromechanical systems (MEMS) sensor, said second sensor package including a second MEMS sensor, and both of the first and second sensor packages being disposed within said single housing;

a casing having top and bottom ends, said casing configured to house therein said filter element, said end cap, and said sensor component;

a signal receiver coupled to said bottom end of said casing;

a transmitter coupled to said sensor component, said transmitter being configured to wirelessly transmit measurement data from said first and second MEMS sensors to said signal receiver; and

a sleep-mode feature, wherein said first and second MEMS sensors and said signal receiver are configured to remain in an unactuated state in the absence of fluid flow, said first and second MEMS sensors becoming actuated once fluid flow is initiated, and said signal receiver becoming actuated upon receipt of said measurement data.

31. The filter module of claim 30, wherein said first and second MEMS sensors are pressure sensors.