Diaphragm liquid pump NF 25, NFB 25
Operation
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions
16
Switching the pumps on and off
The motor speed of the pumps, and thus the flow rate, is adjusta-
ble and can also be regulated to some extent.
For more details, see Chapter 4, Technical data.
Duty cycle / short cycle operation
KNF pumps are designed for continuous operation.
Short start and stop cycles may adversely affect the service life of
the brushed motors.
If the pump is operated with short cycles in your application,
please contact your local KNF partner for further information
(www.knf.com.)
Switching on the pump
In order to ensure that the pump starts every time, make sure
that counterpressure is reduced to an acceptable level before
start-up. This should also be done during operation after a brief
power cut. Please contact your local KNF partner for further in-
formation (www.knf.com).
Switching off the pump
KNF recommends: If transferring aggressive liquids, the pump
should be flushed thoroughly prior to switch off (see Chapter
8.2.1), as this will help to lengthen the service life of the dia-
phragm.
Restore the system to normal atmospheric pressure (release
hydraulic pressure in pump).
Setting and regulating motor
speed
Short cycle operation
CAUTION
Overpressure on the suction side causes medi-
um to flow through the switched-off pump
Take steps to ensure that this cannot produce a
hazardous situation.