Operation
31
© Lutz-Jesco GmbH 2020
Subject to technical changes.
200318
BA-10491-02-V01
Piston diaphragm dosing pump
MEMDOS KMS LB/LA
Operating instructions
11.2 Adjusting the delivery rate
The stroke length of the pump is always the same. The delivery rate is set
via the vertical position of the slide valve. The maximum delivery rate has
been set if the slide valve is standing in the highest position. The setting
can be read off from the scale of the delivery rate adjustment unit.
The compressibility of the hydraulic oil and the process fluid restricts the
delivery rate. The pump is designed so that the maximum nominal pres-
sure is reached upon nominal supply.
Depending on the actual operating conditions, it can be necessary to per-
form further settings on-site. If the delivery pressure is lower than the
specified maximum, or the process fluid exhibits a smaller compressibili-
ty, the characteristic curve moves upwards. If the compressibility is high-
er, the characteristic curve is displaced downwards. Whatever happens,
the linearity of the characteristic curve is not affected (see Fig. 15: Deliv-
ery characteristic curves“ on page 31). The delivery rate is adjusted
using the manual stroke adjustment unit. The calibration of the delivery
rate setting is performed as follows.
10490000_5
BA Bild MEMDOS KMS LB 14 E-Stahl/FPM
11.2 Fördermengen anpassen
2
3
1
Fig. 16: Adjusting the delivery rate
Perform the following working steps:
1.
If the pump supplies at normal system pressure, turn in the manual
delivery rate adjustment unit until the supply stream ends and the
pump stops.
2.
Remove the protective cap of the manual stroke adjustment unit.
3.
Hold the threaded rod (1) in position with a screwdriver.
4.
Loosen the upper nut (2) and the curled thumb screw (3).
5.
Continue to hold the threaded rod (1) tight and turn the stroke adjust-
ment unit to zero percent.
6.
Retighten the nut (2).
7.
Place on the protective cap.
ü
Calibration of the delivery rate setting completed.
11.3 Decommissioning the dosing pump
Perform the following working steps:
1.
Stop the dosing pump by turning the delivery rate setting to 0 %.
2.
Disconnect the dosing pump from the power supply.
3.
Disconnect all electrical connections.
4.
Depressurize all the hydraulic parts in the system.
5.
Unplug all the hydraulic connections on the dosing pump.
6.
Empty the dosing head.
7.
Remove any residual dosing medium from the dosing head by flush-
ing the system with a washing agent. Ensure that the washing agent
is compatible with the dosing medium.
ü
Dosing pump is decommissioned.
11.4 Shutting down in an emergency
n
In an emergency, you must immediately disconnect the dosing pump
from the mains supply or activate the Emergency Stop switch installed
Flo
w ra
te in stroke
0
20 40 60
80 100
Stroke adjustment in %
Factory setting
Effects of lower pressure
Effects of higher pressure
Fig. 15: Delivery characteristic curves
