SICK FFU, Operating Instructions Manual, Page: 50 / 56

EN
Operating instructions FFU
8 Technical data
50 8013863/10L9 /2018-08-01 © SICK AG • Fluid sensors • Germany • Subject to change without notice
4 - 20 mA
For the following graphic “min Range” is used for 0 % and “max Range” is used for 100 %.
Current output 4...20mA
0
2
4
6
8
10
12
14
16
18
20
22
24
-20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120
Value [%]
Current [mA]
Value Current
Empty pipe 3.5 mA
Smaller -1.2 % 3.8 mA
Between -1.2 % and 0 % Linear interpolation from 3.8 mA to 4 mA
0 % (min range) 4 mA
Between 0 % and 100 % Linear interpolation from 4 mA to 20 mA
100 % (max range) 20 mA
Between 100 % and 102.5 % Linear interpolation from 20 mA to 20.4 mA
Bigger 102.5 % 22 mA
Behavior of the thermocouple
The integrated thermocouple has no direct contact to the liquid and is used to calculate the expansi-
on of the housing. The environment temperature has a big influence on the measured temperature
of the thermocouple. The response time of temperature changes is very high caused by the mounting
position of the thermocouple inside the housing.
Step-response time
Step-response time after a significant temperature change. (Filter „Off“)
Sprungantwortzeit
Te
m
peratur (%
)
Zeit (min)
100
80
60
40
20
0
0 5 10 15 20 25 30 35 40 45
Step-response time
Te
m
peratur
e (%)
Time (min)
100
80
60
40
20
0
0 5 10 15 20 25 30 35 40 45