Electronic level sensor
LW2720
29
Parameter
Options
Explanation
Access
FOU2
[On] = analogue output switches to a val-
ue > 21 mA in alert mode.
Switching output switches ON in alert
mode.
[OFF] = analogue output switches to a
value < 3.6 mA in alert mode.
Switching output switches OFF in alert
mode.
Response of OUT2 in alert mode.
dAP
Setting range: 0...600 s
Damping of the measured signal (filter).
S.Lvl
Setting range: 0...10 m
Level to be simulated in simulation mode.
The set value is not part of the data storage. It is
not stored in the master.
S.Tim
[60 min] fixed setting.
Simulation time.
Alert mode delay
time
Setting range: 0...1000 s
The time delay for transfer to alert mode.
Only effective in case of a fault. Defined state in
the event of a fault (alert mode) (
Detection threshold
Setting range: 0...20,000 mV
Level detection threshold (
Ò
Fig. Detection
threshold).
*
)
According to VDMA, the switch-on delay always has an effect on set point 1 (e.g. [SSC1 Param.
SP1]), the switch-off delay always on the hysteresis or reset point 2 (e.g. [SSC1 Param. SP2])
irrespective of whether the normally open or normally closed function is used.
Reference height:
A
B
C
Fig. 14: Reference height
A:
device reference point (lower edge/sealing edge of the process connection)
B:
reference height (measuring range)
C:
zero point (tank bottom or lower end of the measuring range)
The measuring range ends at the zero point (C).
•
Levels below zero are not detected; [0.0 m] is provided as process value.
•
If the level drops below zero, the unit briefly sends the process value [NoData] and the error
message [No reflection signal].
If this behaviour is not desired:
u
Ensure that the level does not fall below the minimum (position C), e.g. by selecting suitable switch
points (or by throttling the outlet).
Or alternatively:
u
Enter a tank offset (
Ò
Fig. Tank offset)
Tank offset:
GB
