Electronic level sensor
LW2720
11
100%
(20mA)
0%
(4mA)
D
C
A
B
2
1
I [mA]
L
20
4
ASP2
(AEP2)
AEP2
(ASP2)
Fig. 2: Analogue output
A:
blind zone
I:
current
B:
zone with reduced accuracy
L:
level
C:
recommended measuring range
1:
rising curve ([ASP2]<[AEP2])
D:
zero point = reference point
2:
dropping curve ([ASP2]>[AEP2])
Note the tolerances and accuracies during the evaluation of the analogue signal
(
Ò
Data sheet).
5.3.2 Switching function
Via switching output OUT1 (factory setting) or additionally via OUT2 (can be set) the unit signals that a
set limit level has been reached or that the level is below the limit. The following switching functions
can be selected:
•
hysteresis function / normally open or normally closed (
Ò
Fig. Single-point mode and fig. Two-point
mode)
•
window function / normally open or normally closed (
Ò
Fig. Window function)
The hysteresis function can be applied in single-point mode and in two-point mode. Functionally, both
modes are the same; only the setting method differs.
The explanations below refer to output OUT1.
Hysteresis function single-point mode:
u
[SSC1 Config. Mode] must be set to [Single point].
u
First the set point [SSC1 Param. SP1] is set, then the hysteresis [SSC1 Config. Hysteresis] with the
requested difference (
Ò
Fig. Single-point mode).
The normally open or normally closed function is set by [SSC1 Config. Logic]:
[no] = normally open / [nc] = normally closed.
Hysteresis function two-point mode:
u
[SSC1 Config. Mode] must be set to [Two point].
u
[SSC1 Param. SP1] sets the set point and [SSC1 Param. SP2] sets the reset point (
Ò
Fig. Two-
point mode).
u
[SSC1 Param. SP1] must be greater than [SSC1 Param. SP2].
The normally open or normally closed function is set by [SSC1 Config. Logic]:
[no] = normally open / [nc] = normally closed.
GB
