13Pressure gauges with inductive contact model 831, for hazardous areas
14320154.01 06/2019 EN/DE
EN
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”).
When screwing the instruments in, the force required for sealing must not be applied through
the case, but only through the spanner ats provided for this purpose, and using a suitable
tool.
For parallel threads, use at gaskets, lens-type sealing rings or WIKA prole 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 tted to an instrument, it must be protected against
being blocked by debris and dirt.
Installation
Nominal position per EN 837-3 / 9.6.6 gure 7: 90° ( ⊥ )
Process connection lower mount
With lled versions the vent valve at the top of the case must be opened before commis-
sioning!
For outdoor applications, the selected installation location has to be suitable for the
specied ingress protection, so that the instrument is not exposed to impermissible
weather conditions.
In order to avoid any additional heating, the instruments must not be exposed to direct
solar irradiation while in operation!
To ensure that the pressure can be safely vented in the case of failure, instruments with
blow-out device or blow-out back must keep a minimum distance of 20 mm from each
object.
Installation with open-ended
spanner
Sealing in the thread
Spanner ats
Sealing face
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