5 Optional modules
Operation manual mzr-4622
18
Technical data subject to change without prior notice!
Last update: March 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 1000 (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 13
The by-pass module example with mzr-2521
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
approx. 32 x 25 mm (by-pass module without pump)
Weight
approx. 140 g (by-pass module without pump)
table 8
Technical data of the by-pass module
