DFT
page 4 DFT K02/0316
5. Operating Principle
The established vane technology has proven itself a million times world wide for
measuring and monitoring the flow of different media through piping. KOBOLD
flow meters/monitors work with this proven principle and offer many benefits.
The heart of the new KOBOLD vane is an embedded ring magnet; it is
hermetically sealed from the flow medium. It transfers, in a non-contacting
manner, the rotary motion of the vane to a Hall sensor attached to the case (in
order to save space). This converts the rotary motion to a frequency signal that is
proportional to the flow rate. The downstream KOBOLD evaluating electronics
can output this signal to a display, convert it to (0(4)-20 mA, 0-10 V) analogue
signal, or count it. It may also be used to switch up to two limit contacts. The
ready and control states of the limit value relay are indicated by LEDs.
The modular design of KOBOLD flow monitors and measuring instruments is a
system that can be universally applied; it is reasonably priced; and requires
minimum space when in service. Very precise measurement results can be
achieved under tough operating conditions with the KOBOLD electronics. The
system is assembled with the electronics and delivered ready for service. The
electronics are adjusted and tuned for use with the sensor. When retrofitted for
other measuring ranges, the system may be readjusted with a similar device at
any time.
6. Mechanical Connection
Before installation
Please ascertain whether the actual flow throughput matches the flow range of
the instrument. The flow range may be obtained from the label.
Warning! If the measuring range is exceeded by more than 20%,
bearing damage may occur.
Remove all packing materials and transport retainers and ensure that no such
materials remain in the device.
Make sure that the maximum operating pressure and temperature of the
device are not exceeded. (see section 10 Technical Information)
Mount the flow indication tension-free into the pipe.
Protect the measuring tube from external damage.
Avoid pressure surges in the measuring tube, such as those arising from fast
start up/shut off of flow or pulsating flow.
The contact-version units may not be installed at a location within an inductive
field.
If possible, it should be checked after mechanical installation, to see if the
connections between union fittings and pipes are properly sealed
