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ABB LWT300 Series User Manual
Also see for LWT300 series: User guideQuick start guideQuick start guideQuick start guide
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Configuring the instrument 51All these conditions are disabled by default. They are all enabled in a similar fashion, as explainedbelow:1 Select Device Setup > Application Setup > Process Condition.2 Highlight the relevant process condition and press Edit.3 Highlight Enable and press OK.Setting data filtering parametersProcesses can induce noise in level measurements. The LWT filtering feature is designed stabilizemeasurements by filtering out extraneous data that could negatively impact the resolution of themeasured level (spikes, obstructions by mixer blades, lack of signal, etc.).These parameters are set in the Filtering menu under the Device Setup menu.—Figure 38 The Device Setup menuThe various filters available are applied in a sequence as follows:Damping — Median filter — Max Level Rate — Amplitude ThresholdSelecting maximum level rateThe maximum level rate is the rate at which the process will reach its Full limit. This influences theprocessing speed of the instrument. The default value is No Filter.To set the maximum level rate:1 Select Device Setup > Filtering > Max Level Rate.2 Press Edit.3 Highlight the appropriate maximum level rate and press OK.Setting up a median filterThe median filter is designed to filter out noisy measurement spikes in applications with fast transients(e.g., rapidly varying processes, positioning applications, etc). It is used for discarding occasional falsemeasurements resulting from any occasional unwanted phenomena that might occur in the process.The value entered corresponds to the number of measurements kept in the buffer. The filter thengenerates and returns a median value of all the measurements kept in the buffer. The buffer size canrange from 1 to 50 measurements. The default value is 1.NOTICESelecting 1 measurement effectively disables the median filter as no averaging can beperformed. |
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