Filter monitoring system
First Claim
Patent Images
1. A filter monitoring system comprising:
- a differential pressure sensor for monitoring a filter element;
a controller in communication with said differential pressure sensor to determine a filter element performance at a multitude of time intervals in response to signals from said differential pressure sensor and determine a predicted filter element performance;
a system memory in communication with said controller to store said filter element performance at said multitude of time intervals and said predicted filter element performance, said controller operable to compare said filter element performance with said predicted filter element performance; and
a display in communication with said controller, said display generating a warning when said controller determines that Vi>
Pi+E, where Vi is the filter Δ
P reading at a given time ti;
Pi is a predicted value based on a mathematical calculation based on prior occurrences of Vi−
m, E is a user-specified interval.
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Abstract
A filter monitoring system employs a differential pressure sensor to provide a continuous signal output proportional to a pressure drop across a filter element. The differential pressure sensor communicates with a controller that provides output signals to indicate that the filter requires replacement and provides advanced warning for when the filter element will reach a predicted filter differential pressure limit value.
62 Citations
12 Claims
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1. A filter monitoring system comprising:
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a differential pressure sensor for monitoring a filter element; a controller in communication with said differential pressure sensor to determine a filter element performance at a multitude of time intervals in response to signals from said differential pressure sensor and determine a predicted filter element performance; a system memory in communication with said controller to store said filter element performance at said multitude of time intervals and said predicted filter element performance, said controller operable to compare said filter element performance with said predicted filter element performance; and a display in communication with said controller, said display generating a warning when said controller determines that Vi>
Pi+E, where Vi is the filter Δ
P reading at a given time ti;
Pi is a predicted value based on a mathematical calculation based on prior occurrences of Vi−
m, E is a user-specified interval. - View Dependent Claims (2, 3, 4)
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5. A method of monitoring a filter element comprising the steps of:
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(1) measuring a differential pressure of a filter element at a time interval; (2) comparing the measured differential pressure with a predicted differential pressure for the time interval; (3) issuing a warning when the comparison of said step (2) indicates the measured differential pressure deviates from the predicted differential by a predetermined amount; and (4) resetting a time interval to zero to indicate a filter replacement. - View Dependent Claims (6, 7, 8, 9)
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10. A method of monitoring a filter element comprising the steps of:
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(1) setting a user-specified time interval to declare an advanced warning for a filter element replacement, the filter element replacement occurring when the filter element will have a differential pressure of a predetermined differential pressure limit value; (2) measuring a differential pressure of a filter element at a multitude of time intervals; (3) comparing the measured differential pressure at each of the multitude of time intervals with a predicted advanced warning differential pressure which represents the predetermined differential pressure limit value less the user specified time interval; and (4) issuing a warning when the comparison of said step (3) indicates that the measured differential pressure approximates the predicted advanced warning differential pressure. - View Dependent Claims (11, 12)
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Specification