WIKA PSD-3 Serie Manual De Instrucciones página 20

6. Commissioning, operation
6.1 Making the mechanical connection
With flush process connections (model PSD-31), remove the protection
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cap not until shortly before mounting. During installation, ensure that the
EN
diaphragm is not damaged.
The sealing faces at the instrument always have to be clean.
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Only ever screw in, or unscrew, the instrument via the spanner flats.
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Never use the case as a working surface.
The correct torque depends on the dimensions of the pressure connec-
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tion and the gasket used (form/material).
When screwing in, do not cross the threads.
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For information on tapped holes and welding sockets, see Technical
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Information IN 00.14 at www.wika.de.
Seal
Parallel threads
per EN 837
Correct sealing of the process connections with parallel threads at the sealing face
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.
20
per DIN 3852-E

WIKA operating instructions pressure switch, model PSD-3x
Tapered threads
NPT, R and PT
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must be made
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