Commissioning, Operation; Mechanical Connection - WIKA 821 Mode D'emploi

5. Commissioning, operation

5. Commissioning, operation

5.1 Mechanical connection

In accordance with the general technical regulations for pressure gauges (e.g.
EN 837-2 "Selection and installation recommendations for pressure gauges").
EN
When screwing the instruments in, the force required for sealing must not be
applied through the case, but only through the spanner flats provided for this
purpose, and using a suitable tool.
For parallel threads, use flat gaskets, lens-type sealing rings or WIKA profile
sealings at the sealing face . With tapered threads (e.g. NPT threads), sealing is
made in the threads , using a suitable sealing material (EN 837-2).
The torque depends on the sealing used. In order to orientate the measuring
instrument so that it can be read as well as possible, a connection with clamp
socket or union nut should be used. When a blow-out device is fitted to an instru-
ment, it must be protected against being blocked by debris and dirt.
5.1.1 Installation
Nominal position per EN 837-3 / 9.6.6 figure 7: 90° ( ⊥ )
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Process connection lower mount
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With filled versions the vent valve at the top of the case must be opened before
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commissioning!
For outdoor applications, the selected installation location has to be suitable
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for the specified ingress protection, so that the instrument is not exposed to
impermissible weather conditions.
10 Operating instructions pressure gauges with switch contact models 821, 851 or 830 E
Spanner flats
Sealing face

Installation with open-
ended spanner
Sealing in the thread
