The flow monitor
• detects flow velocity and temperature in liquid and gaseous
media,
• displays the current flow (LED bar green) or the current temperature
(LED bar red), function is selectable,
• switches the outputs according to the programming:
S1 (pin 4): flow monitoring
S2 (Pin 2): temperature monitoring or logic combination
flow/temperature (
table page 59)
Due to the calorimetric measuring princple when no flow is present
the temperature of the medium in contact with the sensor can rise.
This can lead to switching of output S2 if the switch point SP
Temp
is set
close to the medium temperature.
This can be avoided by setting the switch point slightly higher than the
medium temperature or by setting output S2 to logic function 1.
The specified accuracy of temperature monitoring is only given at a
minimal flow of 5 cm/s (liquids) / 100 cm/s (gases).
23
ENGLISH
Function and features
Output function Output
normally open
switched if flow ≥ SP
Flow
not switched if flow < SP
Flow
normally closed
not switched if flow ≥ SP
Flow
switched if flow < SP
Flow
Logic
function
0
1
2
3
4
5
6
7
8
9
For use as N.O. function S2 is
switched when
For use as N.C. function S2 is
not switched when
temperature ≥ SP
Temp
flow ≥ SP
Flow
and temperature ≥ SP
Temp
flow ≥ SP
Flow
and temperature < SP
Temp
flow < SP
Flow
and temperature ≥ SP
Temp
flow < SP
Flow
and temperature < SP
Temp
flow ≥ SP
Flow
or temperature ≥ SP
Temp
flow ≥ SP
Flow
or temperature < SP
Temp
flow < SP
Flow
or temperature ≥ SP
Temp
flow < SP
Flow
or temperature < SP
Temp
temperature < SP
Temp
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