WIKA 432.36 - Manual (Page 9)

6. Commissioning, operation
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 gauges in, the force required for this must not be applied through
the case, but rather through the spanner flats (using a suitable tool) provided for
this purpose on the square shaft of standard connections.
Correct sealing of pressure gauge connections with parallel threads  must be
made using suitable sealing rings, sealing washers or WIKA profile seals. 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).
The torque depends on the seal used. Connecting the gauge using a clamp
socket or a union nut is recommended, so that it is easier to orientate the gauge
correctly. When a blow-out device is fitted to a pressure gauge, it must be
protected against being blocked by debris and dirt.
With safety pressure gauges (see dial symbol k) ensure that the free space
behind the blow-out back is at least 15 mm.
WIKA operating instructions pressure gauge model 4 per ATEX 9
2080276.04 12/2010 GB/D/F/E
GB
Installation with
open-ended
spanner
Flange connection 1)
1) The screw connection of the flange
must not be opened
Sealing in the
thread 
Spanner flats
Sealing face 
6. Commissioning, operation
5.2 Packaging
Do not remove packaging until just before mounting.
Keep the packaging as it will provide optimum protection during transport (e.g.
change in installation site, sending for repair).
5.3 Storage
Permissible conditions at the place of storage:
„ Storage temperature: -20 ... +70 °C (optional: -40 … +70 °C)