KAL-A(K)
Page 4
KAL-A(K) K05/1116
Materials
Sensor Stainless
steel
(1.4301, 1.4305, 1.4571)
Electronic cover
Glass fibre reinforced polyamide
Setting ranges
in relation to nominal tube diameter
ID (mm) Meas. range (L/min) water ID (mm) Meas. range (L/min) water
8
0.12 - 6.0
40
3.0 - 150
10
0.19 - 9.4
50
4.7 - 235
15
0.42 - 21.8
60
6.8 - 340
20
0.75 - 37.7
80
12.0 - 603
25
1.18 - 59.0
100
18.8 - 942
30
1.7 - 84.8
150
42.4 - 2120
Attention! The flow ranges specified in the table above have been
calculated for each pipe diameter based on the known velocity
range of the KAL-A(K). It must be noted that flow in pipes is non-
uniform across the pipe cross section, and approaches zero at the
pipe wall. This means that, in practice, the depth of installation of
the probe, the internal pipe diameter, and the flow profile of the
liquid in the pipe can interact to produce significant deviations from
the flow ranges in the above table.
5. Operating
Principle
The KAL-A... Flow Meter/ -Monitor uses the proven thermal dispersion principle
and operates as follows: The probe is heated internally to a few degrees above
the temperature of the medium into which it extends. The flowing medium takes
this heat off the probe, i.e. the probe is cooled down. The cooling rate is
proportional to the flow rate. The electronic converts the signal into a proportional
current signal (4-20 mA) linear to the flow rate. With model KAL-AK the requested
flow rate will be compared with the flow rate existing and if the set- point is
reached a PNP/NPN switch is activated. The microprocessor-controlled design
permits simple calibration and set-up. The compact probe design permits
monitoring of flow rate with minimum pressure loss.