DPL
page 4
DPL K07/0322
5. Operating Principle
The KOBOLD flow meters models DPL are used to measure and monitor liquids.
Its compact design allows it to be used in equipment where only small space is
available. The large number of evaluating electronics offered means that the
system is suited for a wide range of applications.
The medium flows through a specially shaped flow housing and causes a vane to
rotate. This rotary motion is sensed by optoelectronics in a non-contacting
manner, and converted to an asymmetric frequency signal or an analogue signal.
A frequency divider with symmetrical output is available as an option. The
frequency is proportional to the flow velocity. The vane has a sapphire-bearing
and ensures a high degree of linearity and long service life.
6. Mechanical Connection
6.1. Check of operating conditions
flow rate
maximum operating pressure
maximum operating temperature
Note! Exceeding the measuring range can cause damage to the axle
bearings, resulting in significant errors in measurement.
6.2. Mounting
Flow in direction of the arrow (universal positioning).
Avoid high pressure or tensile/torsion loads on the connection joints.
Fasten inlet and outlet pipe mechanically at a distance of approx. 50 mm from
the connection joint.
Check the connections for leaks.
We recommend a minimum inlet straight run of 5xDN and a minimum outlet
straight run of 2xDN.
