Burkert 8025 Series Operating Instructions Manual page 50

hysteresis operating
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.
Contact
ON
OFF
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 operating: the output status changes as soon as any threshold (X- or X+) is reached.
Contact
ON
OFF
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+)
Figure 39: Window or hysteresis operating
Figure 40: Operation example of the transistor output with switching thresholds
48
Not inverted
flow rate
X- X+
Not inverted
flow rate
X- X+
High switching threshold
Low switching threshold
hysteresis operating
Not inverted
DEL= 0s
Inverted
Not inverted
DEL= 2s
Inverted
Window operating
Not inverted
DEL= 0s
Inverted
Not inverted
DEL= 2s
Inverted
English
Contact
ON
OFF
Contact
ON
OFF
X-
Flow rate
2 s 2 s
DO
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Type 8025 UNIVERSAL
Operatingandcommissioning
Inverted
flow rate
X- X+
Inverted
flow rate
X+
2 s
t