Tecfluid FLOMID Series Instruction Manual

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Tecfluid FLOMID Series Instruction Manual Manual pdf 29 page image

29When the flow rate is stable, press the key (Enter) and the instrument will save the value.The configuration of this filter can be very useful in the cases where the flow rate readingshave some instability (due to air bubbles, solids in suspension, etc.Only the flow rate indication of the display is affected by the filter. The digital outputs and thetotalizer act according to the non-filtered flow rate. Selecting a filter with a longer or shorterintegration time will provide more or less stable readings and will also affect the response timeto small variations of flow rate.The number of samples can be selected with a minimum value of 2 samples and a maximumvalue of 250 samples. For example, with 15 samples, the display will indicate the flow ratereading of the average flow rate over the last 15 flow rate samples measured.For liquid velocities below 1 m/s, the filter is always operational. For velocities from 1 m/s,when there is a sudden variation of flow rate, the filter should react as fast as possible to givea correct reading of the new value. For this reason, the filter controls the deviation of theinstantaneous flow rate with respect to a reference for each reading. If this deviation exceeds0.2 m/s, the filter stops acting, indicating the instantaneous value, and starting the filteringprocess again.7.4.4 OffsetIn order to obtain a perfect linearization of the instrument, it is recommended to make anadjustment of the zero offset each time an installation is performed, and if it is possible tostop the flow rate.The flow rate must be zero, that is, the liquid inside the pipe where the flowmeter is installedshould be completely stopped. Furthermore, a completely full pipe is necessary in order tomake an effective adjustment.When the option Offset is selected, the following screen is shown: