18 WIKA operating instructions pressure switch, model PSD-3x
EN
11430486.07 04/2015 EN/DE/FR/ES
4. Design and function
4.1 Description
By means of a sensor element and by supplying power, the prevailing pressure is converted into a
switching signal or an amplied standardised electrical signal via the deformation of a diaphragm. This
electrical signal varies in proportion to the pressure and can be evaluated accordingly.
PSD-30: Process connection with internal diaphragm (standard version).
PSD-31: Process connection with ush diaphragm for highly viscous or crystallising media that may clog
the bore of the process connection.
4.2 Scope of delivery
Cross-check the scope of delivery with the delivery note.
For ush design (model PSD-31) with pre-mounted sealings and protection cap.
5. Transport, packaging and storage
For the protection of the diaphragm, the ush design (model PSD-31) is delivered with a
special protection cap.
■
In order to avoid damage at the diaphragm and/or the process connection thread,
remove the protection cap by hand only just before installation.
■
Keep the protection cap for subsequent storage or transport.
■
Fit the protection cap before dismounting and transporting the instrument.
5.1 Transport
Check the instrument for any damage that may have been caused by transport. With ush design
(model PSD-31), additionally check the diaphragm for any optical damage.
Obvious damage must be reported immediately.
4. Design and function / 5. Transport, packaging and storage
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