WIKA PSD-31 - Manual (Page 17)

17 WIKA operating instructions pressure switch model PSD-3x
GB
11430486.06 02/2012 GB/D/F/E
6. Commissioning, operation
Correct sealing of the process connections with parallel threads at the sealing face  must be made
using suitable flat gaskets, sealing rings or WIKA profile sealings.
The sealing of tapered threads (e.g. NPT threads) is made by providing the thread with additional
sealing material such as, for example, PTFE tape (EN 837-2).
For further information on seals see WIKA data sheet AC 09.08 or under www.wika.com.
Seal
6.1 Making the mechanical connection
■ With flush process connections (model PSD-31), remove the protection
cap not until shortly before mounting. During installation, ensure that the
diaphragm is not damaged.
■ The sealing faces at the instrument always have to be clean.
■ Only ever screw in, or unscrew, the instrument via the spanner flats.
Never use the case as a working surface.
■ The correct torque depends on the dimensions of the pressure connec-
tion and the gasket used (form/material).
■ When screwing in, do not cross the threads.
■ For information on tapped holes and welding sockets, see Technical
Information IN 00.14 at www.wika.de.
Parallel threads Tapered threads
per EN 837 per DIN 3852-E NPT, R and PT

