EWS UFS8000, Руководство по эксплуатации

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UFS8000 Components 27
As far as level measuring is concerned, the percentage with empty tank, the percentage with full tank
and the percentage for refilling the tank can be specified.
The installation will enter the “Filtration” phase as soon as the percentage goes below the level of the
one specified for filling the tank. It will leave the “Filtration” phase as soon as the percentage level
reaches higher than the level specified for a full tank.
6.5.2. Raw water tank
There are two available types of level measuring, namely measurements with level switches (1 or 2) or
level measurements with a 0(4)-20mA output that can be connected to a 0-20mA control input (if
available).
Take note:
The following description assumes that the start of the “Filtration” phase is not blocked by a full
storage tank, or by the position of an eventual “Start filtration” switch.
Level switches
If the level switches are being used, the “Interface Input” will have to be specified.
Two level switches may be placed in a raw water tank. A high-level switch (HL) and a low-level switch
(LL). For the inventory the level switch that is connected can be indicated.
Should the two level switches not be connected, then the installation can be switched on via the level
in the storage tank, the position of the “Start filtration” switch or through manual operation in the
“Filtration” phase
If both switches are connected the unit will be switched in the “Filtration” phase as soon as the low-
level switch is not active. The unit will quit the “Filtration” phase again as soon the high-level switch is
active.