Burkert 8045 - Page 45

41
Operating and functions
Hysteresis switching
The output status changes when a threshold is reached:
• by increasing flow rate, the output status changes when the high threshold X+ is reached.
• by decreasing flow rate, the output status changes when the low threshold X- is reached.
ON
OFF
Contact
X- X+
flow rate
Not inverted
ON
O
FF
Contact
X- X+
flow rate
Inverted
X- = low switching threshold of the transistor or the relay (1-, 2- or 3-)
X+ = high switching threshold of the transistor or the relay (1+, 2+ or 3+)
Window switching: the output status changes as soon as any threshold (X- or X+) is reached.
ON
O
FF
Contact
X- X+
flow rate
Not inverted
ON
O
FF
Contact
X- X+
flow rate
Inverted
X- = low switching threshold of the transistor or the relay (1-, 2- or 3-)
X+ = high switching threshold of the transistor or the relay (1+, 2+ or 3+)
Fig. 36: Window or hysteresis switching
2 s 2 s
2 s
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
DO
t
Hysteresis switching
Window switching
Not inverted
Not inverted
Inverted
Inverted
Not inverted
Not inverted
Inverted
Inverted
Flow rate
High switching threshold
Low switching threshold
DEL= 0s
DEL= 2s
DEL= 0s
DEL= 2s
Fig. 37: Operation example of the transistor output with switching thresholds
English
Type 8045