Tecfluid CU Series - Manual (Page 28)

28
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 100 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 established limits, the filter will stop acting, indicating the instant value, and
will start again the filtering process.
6.4.4 Offset
In order to obtain a perfect linearization of the instrument, it is recommended to make an
adjustment of the zero offset each time an installation is performed.
When the option Offset is selected, the following screen is shown:
When the read flow rate is stable, press the key OK and the instrument will save the
value.
6
If the first option to make the correction is chosen, the flow rate must be zero, that is, the
liquid inside the pipe where the transducers are installed should be completely stopped.
CONVERTER PROGRAMMING
If in the installation is not possible to stop the flow rate, an offset adjustment can be done
if the flow rate is stable.
To do this, press the option “Flow rate ≠ 0 and the following screen will be shown: