Schmidt
Mess- und Regeltechnik
©2014 Schmidt
Mess- und Regeltechnik
Fon 0 67 32 - 91 91 20 Fax 0 67 32 - 96 24 42 [email protected]
2
1.
Delivery and packing
All instruments delivered are ready for operation. Avoid rough handling in order to prevent
damage to the sensitive built-in measuring and indication mechanism. The measuring unit is
not locked in position during transport.
2.
Function
The Flow-Switches and Flow-Meters of
the described types work on the principle
of dynamic pressure. The flow medium
works against a target plate (4), which
causes the system to swing against a
tension spring (1). A bellows system
made from stainless steel (3) seals the
indicator and switch equipment against
the flowing liquid. Connection between
the target plate and the evaluation
system is made by a lever arm. A micro-
switch (2) is activated whenever the
preselected switch-point is exceeded or
undershot.
In addition, depending on the type a
control-lamp and a motion work with
indicator of the actual flow will be
actuated.
3.
Installation
3.1 Mounting orientation
The Flow-Switches and Flow-Meters are to be installed directly into a pipe system. Make sure
that the instruments are installed according to the information given on the type plate. The
flow direction correlates to the direction of the pipe. Inaccuracy of the instrument will result
from incorrect mounting.
3.2. Flow direction
Due to the applied measuring principle, the devices are functional only, if for the installation
attention is paid to the flow direction. This is indicated by arrows on the device.
3.3 Selecting the mounting position
To avoid damage to the measuring system it is especially important to have the largest
possible distance to magnet and ball valves. If this is not possible, the valves must be
installed in flow direction after the flow monitor. To avoid pressure shocks it is very important
to open the valves as slow as possible.
It is advantageous to install the unit in a straight piece of pipe and to choose a place of
mounting which has a settling distance from elbows, valves etc.
In order to have an accurate function of the device we recommend a straight length of 10 x d
at input side and 5 x d at the output side (d = internal diameter of pipe).
Operation Manual
Flowmeter / Flow Control DW-U
Flow monitor after the baffle plate principle for liquids
