Festo MS-LFM-...-DN Series, Operating Instructions Manual

Page: 32 / 56

MS
Ū
−LFM−
Ū
−DP/DN/DPI/DN I
Festo MS
Ū
−LFM−
Ū
−DP/DN/DPI/DNI 0611NH English
32
T erm E xplanation
Time−constant
measured value
smoothing 1s, 5s, 20s
Selectable time window for the measured value smoothing. The last
measured differential pressure values within this time window will
be used for forming medium values. The weighting of individual error
measurements (e.g. by flow fluctuations) will be reduced with a
larger time window. The smoothed medium value will be shown on
the display and defines the status of the switching output.
Note on the product designs MS
Ū
−LFM−
Ū
−DPI/DNI with analogue
output:
The measured value smoothing has no effect on the signal at the
analogue output. The signal is output without smoothing.
Unit %, bar, kPa, psi
Shows the smoothed differential medium value in the relevant unit.
Peculiarities with unit %":
S
Rough grading in 5 % steps, without 5%, 10% and 15%, i.e.
0%, 20%, 25%,
Ū
, 100%
S
Values greater than 100% cannot be displayed if the differential
pressure rises above 350mbar (maximum pressure).
The display 100% flashes on the screen.
Switching
threshold /
switching point Adjustable switching pressure If the smoothed differential pressure
medium value reaches the switching point, a signal will be output at
the switching output (
è
Fig.10).
Hysteresis Adjustable delay in resetting the switching output to its original
defined status (
è
Fig.10).
Fig.2