Patent application number | Description | Published |
20090055457 | Field device with capability of calculating digital filter coefficients - A digital filter design algorithm is implemented directly within a process control field device or other process related equipment. Filter design parameters are exposed so that filter design parameter values may be provided to the digital filter design algorithm so that the digital filter design algorithm may calculate digital filter coefficients for a digital filter having desired frequency response characteristics. The digital filter design parameter values may be provided by a user, or may be provided as process variable data output from a process control field device or other process related equipment. Once the coefficients of the digital filter having the desired frequency response characteristics have been calculated, the digital filter may be applied to process variable data received by the process control field device or other process related equipment. | 02-26-2009 |
20090089009 | Simplified algorithm for abnormal situation prevention in load following applications - Systems and methods are provided for detecting abnormal conditions and preventing abnormal situations from occurring in controlled processes. Statistical signatures of a monitored variable are modeled as a function of the statistical signatures of a load variable. The statistical signatures of the monitored variable may be modeled according to an extensible regression model or a simplified load following algorithm. The systems and methods may be advantageously applied to detect plugged impulse lines in a differential pressure flow measuring device. | 04-02-2009 |
20090093892 | Automatic determination of the order of a polynomial regression model applied to abnormal situation prevention in a process plant - A system for preventing abnormal situations in process plants is provided. A polynomial regression model is employed to predict values of a monitored variable based on measured samples of a load variable. An abnormal situation is detected when a predicted value of the monitored variable differs from a measured value of the monitored variable by more than a predetermined amount. The system employs one or more algorithms for automatically determining an optimal order or degree of the polynomial regression model. | 04-09-2009 |
20090093893 | System and method for recognizing and compensating for invalid regression model applied to abnormal situation prevention - A system for preventing abnormal situations in process plants is provided. A polynomial regression model is employed to predict values of a monitored variable based on measured samples of a load variable. An abnormal situation is detected when a predicted value of the monitored variable differs from a measured value of the monitored variable by more than a predetermined. The system recognizes when a data model is invalid and takes steps to compensate for the invalid model. | 04-09-2009 |
20090097537 | Simplified algorithm for abnormal situation prevention in load following applications including plugged line diagnostics in a dynamic process - Systems and methods are provided for detecting abnormal conditions and preventing abnormal situations from occurring in controlled processes. Statistical signatures of a monitored variable are modeled as a function of the statistical signatures of a load variable. The statistical signatures of the monitored variable may be modeled according to an extensible regression model or a simplified load following algorithm. The systems and methods may be advantageously applied to detect plugged impulse lines in a differential pressure flow measuring device. | 04-16-2009 |
20110295545 | METHOD AND SYSTEM FOR DETECTING ABNORMAL OPERATION IN A HYDROCRACKER - A system and method for detecting abnormal operation of a hydrocracker includes a model to model the hydrocracker. The model may be configurable to include one or more regression models corresponding to different operating regions of the portion of the hydrocracker. The system and method may also determine if a monitored temperature difference variable deviates significantly from the temperature difference variable predicted by the model. If there is a significant deviation, this may indicate an abnormal operation. | 12-01-2011 |
20120066161 | SIMPLIFIED ALGORITHM FOR ABNORMAL SITUATION PREVENTION IN LOAD FOLLOWING APPLICATIONS INCLUDING PLUGGED LINE DIAGNOSTICS IN A DYNAMIC PROCESS - Systems and methods are provided for detecting abnormal conditions and preventing abnormal situations from occurring in controlled processes. Statistical signatures of a monitored variable are modeled as a function of the statistical signatures of a load variable. The statistical signatures of the monitored variable may be modeled according to an extensible regression model or a simplified load following algorithm. The systems and methods may be advantageously applied to detect plugged impulse lines in a differential pressure flow measuring device. | 03-15-2012 |
20120222494 | DIFFERENTIAL PRESSURE BASED FLOW MEASUREMENT - A system for measuring flow of process fluid through process piping in an industrial process includes a flow restriction element in the process pipe. A first differential pressure transmitter is configured to measure a first differential pressure across the flow restriction element in response to flow of process fluid. A second differential pressure transmitter configured to measure a second differential pressure in the process fluid across the flow restriction element. Circuitry performs diagnostics based upon the first differential pressure and the second differential pressure. | 09-06-2012 |
20130080084 | PRESSURE TRANSMITTER WITH DIAGNOSTICS - A pressure transmitter for use in measuring a pressure of a process fluid in an industrial process. The pressure transmitter includes a pressure sensor having a pressure output related to the pressure of the process fluid. Measurement circuitry is configured to calculate a process variable of the process fluid based upon the pressure output. Diagnostic circuitry diagnoses operation of the industrial process based upon a process parameter of the pressure output. Process parameter calculation circuitry calculates the process parameter based upon pressure output and reduces the effect of an abrupt change in the pressure output on the calculated process parameter. | 03-28-2013 |