WIKA PSD-4 Mode D'emploi page 20

5. Commissioning, operation
Delay times (0 ... 65 s)
This makes it possible to filter out unwanted pressure peaks of a short duration or
a high frequency.
The pressure must be present for at least a certain pre-set time for the output to
EN
switch on. The output does not immediately change its status when it reaches the
switching event (SP), but rather only after the pre-set delay time (DS).
If the switching event is no longer present after the delay time, the switching
output does not change.
The output only switches back when the system pressure has fallen down to the
reset point (PR) and stays at or below the reset point (RP) for at least the pre-set
delay time (DR).
Fig.: Delay times
If the switching event is no longer present after the delay time, the switching
output does not change.
5.10 Damping function
The time constant "x" specifies the time duration which the digital indicator, the
100 %
switching output or the analogue signal requires to approach the end value with
a deviation of ± 1 % following a change in measured value. After a duration of 2
times "x", the output value has reached 100% with a deviation of ± 0.01 % of the
prevailing pressure.
Zeit T ime
0 x
5.11 Measuring range scaling (turndown)
For versions with analogue signals, start of measuring range and end of measuring range can be set within the
permissible measuring range (turndown of 5:1 not to be exceeded).
5.12 Description of the IO-Link functionality (optional)
IO-Link is a point-to-point connection for the communication of the PSD-4 with an IO-Link master.
IO-Link specification: Version 1.1
A detailed description of the IO-Link functionality and the device description file (IODD) can be found online on the
product details page of the pressure switch at www.wika.de.
20 WIKA operating instructions pressure switch, model PSD-4