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2 Safety instructions
Operating manual mzr-2521 and mzr-2921
10
Technical data subject to change without prior notice!
Last update: June 2019
2.7
Improper modes of operation
The safety of operation of the delivered device can only be insured by correct use,
as described in chapter 1. The limit values given in this manual must not be
exceeded in any case.
2.8
General safety instructions
Please observe the following safety instructions
!
The pump may operate at high pressures. For this reason please use only the
delivered accessories and ensure that the employed fittings and tubing have
been prescribed and approved for these pressures.
!
In order to decrease the pressure, provide the system with a pressure control
valve directing the excess liquid to the initial tank or back onto the suction
side.
!
At a standstill, the liquid may flow through the pump in the direction of falling
pressure. In order to avoid this unwanted movement, please integrate non-
return valves (see accessories). This applies also to elevated liquid containers.
!
Protect the micro annular gear pump and the electric drive against strokes and
shocks.
!
Under normal working conditions the shaft sealing rings integrated in the
pump prevent the liquid from leaking out of the device. The micro annual gear
pumps are "technically leak-proof" however not "hermetically sealed" which
means it may occur that gases or liquids enter to or escape from the pump.
The allowed electrical parameters of the drive must not be exceeded. In
particular an incorrect polarity setting of the supply voltage may lead to
damage of the control unit.
Warning
Please insure, that the totality of the liquid supply accessories such as tubes,
hoses, filters etc. are absolutely free from dust or dirt particles. Impurities such
as metal swarf, plastic or glass splinters may impair or damage the pump
leading to its failure.
Warning
Please, operate the pump with a filter featuring 10 µm or smaller pores. It will
protect the pump.