EWS UFS8000, Operating Manual, Page: 35 / 130

UFS8000 Components 28
If only a low-level switch is programmed, the raw water tank programming can be used to set a delay
before the unit is switched on in the “Filtration” phase. If the low-level switch is active the unit will move
directly out of the “Filtration” phase. In all other cases no delay has to be set while the raw water tank
does not appear in the list of components with programmable settings.
Level measurements 0(4)-20mA output
If level measuring with power output is active, the “0-20mA Interface” will be selected.
It will subsequently be possible to select a 0-20mA input. And after that, it will be possible to select the
range of the measurement cell (0-20mA or 4-20mA).
If no hardware connection is made, it will only be possible to switch the installation on and off
manually.
As far as level measuring is concerned, the percentage with empty tank, the percentage with full tank
and the percentage for starting the filtration, can be specified.
The installation will enter the “Filtration” phase as soon as the percentage of the tank goes above the
level of the one specified for switching on the installation. The “Filtration” will be left if the level goes
below the level of the one specified for an empty tank.
6.5.3. Dosing tank
There are two available types of level measuring, namely measurements with a level switch or level
measurements with a 0(4)-20mA output that can be connected to a 0-20mA control input (if available).
Level switch
It is possible to have one level switch in a dosing tank (low level).
Please indicate at which exit the level switch should be connected during the inventory.