Excessive product usage detection using a level monitoring system

• US 7,423,541 B2
• Filed: 08/09/2005
• Issued: 09/09/2008
• Est. Priority Date: 08/10/2004
• Status: Active Grant

• Current Assignee: Invensys Systems Incorporated (Invensys PLC)
• Original Assignee: Robertshaw Controls Company (Schneider Electric SE)
• Inventors: Miller, Wojtek
• Primary Examiner(s): Bugg; George A
• Assistant Examiner(s): LAU, HOI CHING
• Application Number:
  US11/199,982
• Publication Number:
  US 20060032862A1
• Time in Patent Office: 1,127 Days
• Field of Search: 340/568.1, 340/612, 340/613, 340/614, 340/618, 340/623, 340/625, 340/603, 340/539.1, 340/539.22, 340/518, 340/18, 340/539.226
• US Class Current: 340/612
• CPC Class Codes: B67D 1/0871 Level gauges for beverage storage containers level indicators in general G01F
• CPC Class Codes: B67D 2007/329 Function indicator devices
• CPC Class Codes: B67D 7/22 Arrangements of indicators or registers indicating or recording in fluid meters G01F15/06
• CPC Class Codes: B67D 7/32 Arrangements of safety or warning devices; Means for preventing unauthorised delivery of liquid
• CPC Class Codes: G05B 23/0235 based on a comparison with predetermined threshold or range, e.g. "classical methods", carried out during normal operation; threshold adaptation or choice; when or how to compare with the threshold

Abstract

A system for detecting excessive usage of product in a storage tank is provided. The system comprises a monitor and a data center. The monitor is operatively coupled to the tank for monitoring a level of product stored therein. The data center is in communication with the monitor. The data center generates an alarm signal when excessive product usage has been detected.

Claims

1. A system for detecting excessive usage of product in a storage tank, the system comprising:

a monitor operatively coupled to the tank for monitoring a level of product stored therein;

a data center in communication with the monitor;

wherein the data center generates an alarm signal when excessive product usage, defined as a difference between a first monitored level of product and a second monitored level of product equaling or exceeding a threshold level of change, has been detected; and

wherein the monitor is configured to monitor the product level at a first rate and to transmit product level information to the data center at a second rate, and wherein the monitor immediately transmits product level information to the data center when the monitor determines that an excessive usage of product has occurred.

2. The system of claim 1, wherein the data center provides a user interface to enable entry of a user selected threshold level of change, wherein the data center transmits the threshold level of change to the monitor, and wherein the monitor compares the product levels monitored at the first rate to determine if the product usage has exceeded the threshold level of change.

3. The system of claim 1, wherein the monitor and the data center are configured to communicate using a cellular modem.

4. The system of claim 1, wherein the first rate is approximately four times as fast as the second rate.

5. The system of claim 1, wherein the system further comprises a remotely located wireless notification device, and wherein the data center transmits the alarm signal to the notification device.

6. The system of claim 1, wherein the monitor transmits information related to the level of product stored in the tank, and wherein the data center generates an alarm signal when the product level information transmitted by the monitor indicates an excessive usage has been detected.

7. The system of claim 6, wherein the data center provides a user interface to enable entry of a user selected threshold level of change beyond which an excessive product usage alarm signal is to be generated.

8. The system of claim 7, wherein the user interface enables user selection of at least one of a level rise and a level drop excessive usage condition.

9. The system of claim 1, wherein the data center provides a user interface to enable selection of entry of at least one of a level rise and a level drop excessive usage condition alarm monitor, a user selected threshold level of change beyond which an excessive product usage alarm signal is to be generated, display of the alarm signal, and enabling of the alarm function.

10. A method of detecting an excessive usage of product stored in a storage tank, comprising the steps of:

taking an initial reading of a product level in the storage tank;

taking a later reading of the product level in the tank;

comparing the initial reading with the later reading;

generating an alarm signal when the initial reading and the later reading differ by at least a threshold level of change to indicate that the excessive usage has been detected;

reporting information related to the product level in the storage tank at a second rate; and

wherein the step of generating an alarm signal comprises the step of reporting information related to the product level immediately upon generating the alarm signal.

11. The method of claim 10, wherein the step of taking the later reading is repeated at a first rate when the initial reading and the later reading do not differ by at least the threshold level of change.

12. The method of claim 10, further comprising the step of reporting information related to the product level in the storage tank at a second rate, wherein the steps of taking the initial reading comprises the step of taking a last reading from a previous report, and wherein the steps of taking the later readings at a first rate, comparing, and generating the alarm signal are repeated after the step of reporting information.

13. The method of claim 10, wherein the method further comprises the step of relaying at least one of the initial reading and the later reading.

14. The method of claim 10, further comprising the steps of storing the initial reading and the later reading, repeating the step of taking the later reading periodically and storing the later reading, further comprising the step periodically reporting the stored readings at a rate slower than the steps of taking the readings.

15. The method of claim 14, wherein the steps of taking an initial reading, taking a later reading, comparing, and generating are repeated for each cycle after the step of periodically reporting so that the alarm signal indicates an excessive usage of product between reported readings.

16. The method of claim 10, further comprising the step of receiving a user selected threshold level of change.

17. A method of detecting an excessive usage of product in a storage tank, comprising the steps of:

displaying a user interface having a plurality of user selectable options and a threshold level of change input window;

receiving user input to select at least one of a level rise and a level drop excessive product usage function;

receiving a user selected threshold level of change;

receiving first information relating to the level of product in the storage tank;

receiving second information relating to the level of product in the storage tank;

comparing the first information and the second information;

generating an alarm signal when the step of comparing indicates that the user selected threshold level of change has been exceeded;

transmitting the user input and the user selected threshold level of change to a tank level monitor; and

receiving an alarm signal from the tank level monitor indicating that user selected threshold level of change has been exceeded.