KAL
KAL 07/04
Page 5
Attention! For the measuring ranges gives the flow speed was
converted to the nominal tube diameter. It should be noted in line
with this that in the tube towards the wall section the flow speed
approaches 0. Depending on nominal tube diameter, screw depth of
the probe and flow profile, occasional deviations, some of them
considerable, may result.
5. Operating Principle
The all-metal design electronic flow monitor device functions according to proven
calorimetric principles. The measuring probe is heated up a few degrees from the
inside outwards in relation to the flow medium which it is penetrating. If the
medium is flowing then the heat produced in the probe is carried away by the
medium, i.e. the probe becomes cooler. This cooling represents a measuring of
the flow speed.
The electronic setting system compares the desired flow speed with the actual
speed and activates an output relay when the desired value is not reached. By
the use of a micro-controller, simple calibrations is made possible. In this way
optimum temperature compensation can be achieved.
6. Mechanical Connection
Before installation:
•
Ensure that the actual flow quantity corresponds to the setting range of the
device (i.e. to the flow speed).
•
Ensure that the permitted maximum operating pressure and temperatures for
the device are not being exceeded. (See point 13 Technical Information)
Installation:
Mount the sensor in the pipe (KAL-1...)- in a sleeve welded to the pipe (KAL-2...).
Fitting position:
The function of the sensor is not dependent on
their fitting position, provided that the pipe is
completely filled with flow medium. The place
where the sensor are fitted must be free from
turbulence in the medium. (4x pipe section in
front of and behind sensor). If the medium is
likely to cause any deposits in the tube, then an
appropriate fitting position alongside is
recommended.