WIKA PGS23.063 - Manual (Page 11)

WIKA operating instructions model 232.3x.063 with 851 per ATEX 11
GB
11041781.03 03/2011 GB/D/F/E
5. Transport, packaging ... / 2. 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: -40 ... +70 °C
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 or the cable terminal box, but rather through the spanner
flats (using a suitable tool) provided for this purpose on the square shaft of
standard connections.
Installation with
open-ended
spanner
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).