Tecfluid FLOMID Series, Instruction Manual

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7.4.3 Reversal flow rate
The MX4 is a bi-directional converter. The flow rate changes its sign automatically when the
flow is reversed. If after the converter has been installed it is necessary to reverse the flow
rate sign, in this screen it can be done by selecting the option “REVERSAL– Yes”.
7.4.4 Damping
The MX4 converter has an adaptive filter (damping) to provide stable flow rate and analog
output readings in the presence of continuous flow rate fluctuations.
The configuration of this filter can be very useful in the cases where the flow rate readings
have some instability (due to air bubbles, suspended solids, etc.
Only the flow rate indication of the display and the analog output are affected by the filter.
The relay output and the totalizer act according to the instant flow rate. Selecting a filter with
a longer or shorter integration time will provide more or less stable readings and will also affect
the response time to small variations of flow rate.
The integration time is selected in seconds, with a minimum value of 0 and a maximum value
of 40 seconds. For example, with an integration time of 15 seconds, the display will indicate
the flow rate reading of the average flow rate over the last 15 seconds from the last update of
the display. This does not mean that the display is refreshing its data every 15 seconds. The
display shows a new value several times per second, indicating an average of the flow rate
values of the last 15 seconds.
When there is a sudden variation of the flow rate then the filter should react as fast as possible
to give a correct reading of the new value. For this, the filter controls the deviation of the
instant flow rate with respect to a reference for each reading. If this deviation exceeds the
10%, the filter will stop acting, indicating the instant value, and will start again the filtering
process.