5 Optional modules
Operating manual mzr-2521 and mzr-2921
20
Technical data subject to change without prior notice!
Last update: June 2019
5.2
By-pass module (optional)
The by-pass module allows constant minimal volume dosage with flow rates in
the nanoliter range. The technology is based on the division of flow generated by
the micro annular gear pump, according to the relationship of fluidic resistance of
two predefined capillaries. The micro annular gear pump generates a master
circulation from which a side dosage current is derived. This micro flow capillary
allows to obtain flow rates starting at 1 µl/h. The minimal and the maximal flow
rate may differ by a factor of 100 (dynamic factor). In order to determine the
lower flow rate limit, both capillaries need to be carefully configured. It is possible
to obtain flow rates between 1 and 10,000 µl/h.
The by-pass module assures dosage of minimal amounts of liquids at a very high
constancy of flow and a pressure-resistant flow rate.
figure 14
The by-pass module
Performance parameters
Operating flow rate range
1 --- 10,000 µl/h
Differential pressure range
0 --- 3 bar
Max. applied inlet pressure
1 bar
Pulsation
<1 %
Operating temperature
-20 … +60 °C
Viscosity range
0.5 --- 100 mPas
Fluid connections
−
Liquid intake: tube or hose, OD 1/8‘‘
−
Master capillary: tube, OD 1/8‘‘ (return line to the tank)
−
Side current capillary: tube, OD 1/16‘‘ (dosage capillary)
Wetted parts
stainless steel 316L, PEEK
Measurements
32 x 25 mm (by-pass module without pump)
Weight
approx. 140 g (by-pass module without pump)
table 9
Technical data of the by-pass module
