Mechanical Connection - WIKA 831 Manual De Instrucciones

5. Commissioning, operation
WARNING!
Physical injuries and damage to property and the environment caused by
media escaping under high pressure
With the pressurisation of the instrument, as a result of poor sealing of the
process connection, media under high pressure can escape.
Due to the high energy of the media that can escape in the event of a failure, the
possibility of physical injuries and damage to property exists.
▶ The sealing of the process connection must be carried out expertly and
checked for leak tightness.

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").
Instruments must be grounded via the process connection. This is why electrically conduc-
tive sealing should be used at the process connection. Alternatively, take other measures for
grounding. Measures for grounding applied ex works (e.g. welding spots or fuse plates) must
therefore be used to integrate the instruments into the equipotential bonding system and
must not be removed under any circumstances. Ensure that the measures for grounding are
reinstalled after dismounting (e.g. replacing the instrument).
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 LH-RH union or union nut should
be used. When a blow-out device is fitted to an instrument, it must be protected against
being blocked by debris and dirt.
Pressure gauges with inductive contact model 831, for hazardous areas
Spanner flats
Sealing face

Installation with open-ended
spanner
Sealing in the thread
EN

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