Festo 527464 - 3 Method of Operation and Use; Sensor Operating Principle and Signal Curves

SDE5−...
Festo SDE5−... 0609a English
26
3 Method of operation and use
The pressure p" of the tubing system is effective in the pressurized chamber of
pressure switch type SDE5−... . The pressure switch closes (switch element func
tion NO: normally−open) or opens (switch element function NC: normally−closed) a
current circuit when the switching pressure is reached. The switch element func
tion is preset at
the factory and can only be modified on the SDE5−...−FP−... . The
SDE5−... is available with different switching functions (modes 0...3).
The SDE5−... has been designed for monitoring changes in pressure in the com
pressed air system. The SDE5−... converts pneumatic pressure values and supplies
electric signals which can be used
for control or regulating functions.
Signal curve of the applied pressure p"
Switching
function
Switch element function:
NO (normally−open)
Switch element function:
NC (normally−closed)
Mode 0:
Threshold
value
comparator
P
1
0
OUT
SP = TP1
Hy
P
1
0
OUT
SP = TP1
Hy
Mode 1:
Threshold
value
comparator
P
1
0
OUT
SPTP1 TP2
Hy
P
1
0
OUT
SPTP2 TP1
Hy
Mode 2:
Hysteresis
comparator
P
Hy
SP=TP2TP1
1
0
OUT
P
Hy
SP=TP1TP2
1
0
OUT
Mode 3:
Window
comparator
P
1
0
OUT
SP
min
SP
max
=TP1 =TP2
Hy
Hy
P
1
0
OUT
SP
min
SP
max
=TP2 =TP1
Hy
Hy
Fig.3: Key: TP = teach pressure / SP = switching pressure / Hy = hysteresis