Filter with memory, communication and pressure sensor

• US 8,007,568 B2
• Filed: 04/12/2006
• Issued: 08/30/2011
• Est. Priority Date: 04/12/2006
• Status: Active Grant

• Current Assignee: EMD Millipore Corporation (Merck & Co., Inc.)
• Original Assignee: Millipore Corporation (Merck & Co., Inc.)
• Inventors: DiLeo, Anthony, Hubbard, John Dana
• Primary Examiner(s): Hill, Jr.; Robert J
• Assistant Examiner(s): Jones; Christopher P
• Application Number:
  US11/402,438
• Publication Number:
  US 20070240492A1
• Time in Patent Office: 1,966 Days
• Field of Search: 95/19, 961/13, 964/21, 73/37, 73/38
• US Class Current: 95/19
• CPC Class Codes: B01D 2201/291 End caps
• CPC Class Codes: B01D 2201/52 Filter identification means
• CPC Class Codes: B01D 2201/56 Wireless systems for monitoring the filter
• CPC Class Codes: B01D 2311/14 Pressure control
• CPC Class Codes: B01D 2313/44 Cartridge types
• CPC Class Codes: B01D 35/143 Filter condition indicators
• CPC Class Codes: B01D 61/147 Microfiltration
• CPC Class Codes: B01D 61/22 Controlling or regulating
• CPC Class Codes: B01D 65/102 Detection of leaks in membranes
• CPC Class Codes: B01D 65/104 Detection of leaks in membrane apparatus or modules

Abstract

The present invention describes a system and method for accurately measuring the pressure within a filter housing. A pressure sensor and a communications device are coupled so as to be able to measure and transmit the pressure within the filter housing while in use. This system can comprise a single component, integrating both the communication device and the pressure sensor. Alternatively, the system can comprise separate sensor and transmitter components, in communication with one another. In yet another embodiment, a storage element can be added to the system, thereby allowing the device to store a set of pressure values. The use of this device is beneficial to many applications. For example, the ability to read pressure values in situ allows integrity tests to be performed without additional equipment. In addition, integrity testing for individual filters within multi-filter configurations is possible.

Claims

1. A method of determining the integrity of individual filtering elements within a multi-filter housing, comprising:

a. placing a plurality of filtering elements in parallel, each having an input side and an output side, and a corresponding plurality of pressure sensors, inside said multi-filter housing, each of said plurality of sensors being associated with said output side of a respective one of said plurality of filter elements and located in close proximity to said respective one of said plurality of filter elements so as to be able to determine the diffusion rate for said associated individual filtering element;

b. introducing a gas at a predetermined pressure into said multi-filter housing at the input side of each filtering element;

c. measuring with each said sensor a pressure at the output side of each filtering element with which each respective sensor is associated while each of said filtering elements is within said multi-filter housing;

d. determining whether each said measured pressure is within a predetermined range; and

e. identifying any individual filter elements with measured pressures outside said predetermined range.

2. The method of claim 1, further comprising positioning a respective pressure sensor on the input side of each of said filtering elements for determining the pressure on said input side.

3. The method of claim 1, further comprising the step of:

f. replacing any identified filtering element that has a measured pressure outside said predetermined range.

4. The method of claim 1, further comprising combining each said sensor with an orifice, and wherein said pressure comprises gas pressure.

5. The method of claim 1, further comprising repeating step b. at increasing pressures and repeating steps c. and d. for each increased pressure.

6. The method of claim 1, further comprising providing a wireless transmitter, in communication with each said sensor and a receiver located outside of said housing and transmitting pressure measured by each said sensor via said wireless transmitter to said receiver.

7. The method of claim 1, wherein a flow restriction is placed in the flow path of each filtering element on said output side and said pressure is measured across said restriction.

8. The method of claim 1, further comprising providing a wireless transmitter, in communication with each said sensor and wherein said wireless transmitter comprises an RFID tag.

9. The method of claim 1, further comprising:

providing a wireless transmitter, in communication with each said sensor and a receiver located outside of said housing;

transmitting the pressure measured by each said sensor via the wireless transmitter to the receiver; and

wherein the receiver comprises a wireless receiver, adapted to receive signals transmitted from said wireless transmitter.

10. The method of claim 1, wherein each of said filtering elements has a nose, and wherein each of said sensors is embedded in said nose of each filtering element.

11. The method of claim 1, wherein each of said filtering elements has a nose, and further comprising providing a wireless transmitter, in communication with each said sensor and wherein each said sensor and wireless transmitter is embedded in said nose of each filtering element.

12. The method of claim 1, further comprising the step of wetting each filtering element before step b.