9
The width of the window can be set by means of the difference between
FHx and FLx� FHx = upper value, FLx = lower value�
Fig. 5-3
Fig. 5-4
t
L
FH
FL
1
0
1
0
FE
Fno
Fnc
L = level; HY = hysteresis; FE = window
• For each switching output a switch-off delay of max� 60 s can be set (e�g� for
especially long pump cycles)�
5.2.4 Offset for indicating the real level in the tank
The zone between tank bottom and lower edge of the probe can be entered as
offset value [OFS]� So display and switch points refer to the actual level�
5.2.5 Probes for different tank heights.
• The unit can be installed in tanks of different sizes� Probes in different lengths
are available� To adapt to the tank height, each probe can be shortened� The
minimum probe length is 10 cm, the maximum probe length is 160 cm�
• Probe and housing can be rotated without restriction� This enables easy
installation and orientation of the head of the unit after installation�
5.2.6 Safe state
• In case of a fault a safe state can be defined for each output�
• If a fault is detected or if the signal quality is below a minimum value, the
outputs pass into the "safe state"� For this case the response of the outputs can
be set via the parameters [FOU1]���[FOU4]�
• Temporary loss of signal caused e�g� by turbulence or foam formation can be
suppressed by a delay time (→ 10.6.6 [dFo]). During the delay time the last
measured value is frozen� If the measured signal is received again in sufficient
strength within the delay time, the unit continues to work in normal operation�