5. Commissioning, operation
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.
EN
For parallel threads, use flat gaskets, lens-type sealing rings or
WIKA profile sealings at the sealing face
(e.g. NPT threads), sealing is made in the threads
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.
Sealing face
Installation
Nominal position per EN 837-3 / 9.6.6 figure 7: 90° ( ⊥ )
■
Process connection lower mount
■
18
Spanner flats
Pressure gauge with reed contact model 851-A, for Ex areas
Installation with open-ended
spanner
. With tapered threads
Sealing in the
thread
, using a