Manual

E-M-PF4-V1_00
Rotronic AG
Bassersdorf, Switzerland
Document Code Unit
PF4 Differential Pressure Transmitter:
Instruction Manual
Instruction Manual
Document Type
Page
10 of 54
Document Title
© 2014; Rotronic AG E-M-PF4-V1_00
3.2.3 Filters
The curve of the differential pressure measured values can be smoothened with the help of a low-pass filter
with selectable time constant. There are 13 smoothing filter stages available. Practice has shown stages 0...7
meet most application requirements.
Filter Stage
Time Constant 63 Time Constant 99
Description
0 0 s 0 s No filtering
1 0.4 s 1.8 s Weak filtering
2 0.9 s 4.3 s …
3 1.9 s 9.3 s …
4 3.9 s 19.3 s …
5 7.8 s 39.2 s …
6 15.8 s 78.9 s …
7 32.0 s 2.7 min. …
8 1.0 min. 5.3 min. Strong filtering
9 2.1 min. 10.6 min. …
10 4.2 min. 21.2 min. …
11 8.5 min. 42.4 min. …
12 17.0 min. 1.4 h …
13 33.9 min. 2.8 h Extremely strong filtering
3.2.4 Simulator Value
When the simulator value has been activated, a defined simulator value is used instead of the current measured
value.