Adjusting
the discharge of the metering pumps
Recommended
installation
position
Standard
test conditions
The
set pumped volume may change or
repeatability may decrease depending on
usage conditions. Followings are the
examples of factors that affect the pumped
volume and the repeatability of the
metering pumps. Please note the following
factors before using the metering pumps.
Factors
which affect pumped volume and repeatability
The
effect of operating frequency on repeatability
The
effect of suction height on pumped
volume
The
effect of ambient temperature and fluid
temperature on pumped volume and repeatability
Other
factors which may affect pumped volume
Usage
Precautions
> When a pre-set pumped volume is
small, it may take a long time to completely displace the air inside the
metering pump/piping with
liquid. At the initial discharging of the metering pump, the displacement of the air can be
done much faster if the pumped volume setting is set to around the maximum value.
>
The displacement efficiency of gas
varies according to the installation position of the metering pump. It is
recommended to install in the recommended
position since the position influences on the displacement of gas bubbles
formed in fluid.
>
The
pumped volume value set may alter if the
volume adjustment screw is loose. Please
tighten the locknut firmly in order to
prevent such a problem.
>
When
you decrease the pumped volume by turning
the volume adjustment screw clockwise,
please do not turn the volume adjustment
screw with excessive torque while
exceeding the adjustable range. It may
cause pump failure.
>
When
you increase the pumped volume by turning
the volume adjustment screw anticlockwise,
please do not turn the screw too much. If
the volume adjustment screw is turned in
excess of the maximum pumped volume, the
volume adjustment screw may become
detached from the metering pump and there
is a risk to the internal parts of the
metering pump.
