5 Optional modules
Operation manual mzr-2961, mzr-4661
18
Technical data subject to change without prior notice!
Last update: April 2018
figure 13
Construction of a by-pass module with mzr-2521
Working principle
The by-pass module shown in the figure 13 divides the flow generated by the
micro annular gear pump into master and side circulation. The module serves at
the same time as a support and fixture for the micro annular gear pump. The
selection and configuration of the different components of the system is
calculated by a PC. The master circulation capillary (the tube going back to the
liquid tank) and the pump are selected and configured for each customer-
specific dosage task. In this way the pump operates with the desired volumetric
efficiency and can generate pressures reaching beyond the required pressure
level. Depending on the difference of pressures between the delivery side of the
pump and the system, a side current capillary is designed and precisely adjusted
so that the desired minimal flow rate is obtained at its outlet. The flow charts of
the by-pass module are verified before the shipment.
Flow chart examples
Flow rate range 100 – 9000 µl/h
Flow rate range 0.6 – 4.4 µl/h
0
2000
4000
6000
8000
10000
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
Antriebsdrehzahl
n
[U/min]
V
ol
um
ens
tr
om
Q
[µl
/h
]
0,0
1,0
2,0
3,0
4,0
5,0
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
Antriebsdrehzahl
n
[U/min]
V
ol
um
ens
tr
om
Q
[µl
/h
]
Master capillary
ID: 0.25…0.5 mm
Length: 80…300 mm
Side capillary
ID: 0.064…0.25 mm
Length: 80…500 mm
mzr-2521 / mzr-2921
By-pass socket stainless steel 316L
with a manifold assembly,
fixture openings 4 x M3 (
22 mm)
Return line to
the liquid tank
Inlet port of
the pump
Customized nano/micro flow,
starting at 1 µl/h
