Commissioning, Operation - WIKA Typ 4 Betriebsanleitung

7. Commissioning, operation

7. Commissioning, operation
Mechanical connection
GB In according with the general technical regulations for pressure gauges (i.e.

EN 837- "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.
Flange connection
1) The screw connection of the
flange must not be opened
Correct sealing of pressure gauge connections with parallel thread
be means of a suitable sealing ring, sealing washer or WIKA profile seals. The
sealing of tapered threads (e.g. NPT threads) is made by providing the thread
with additional sealing material like, for example, PTFE tape (EN 837-).
Sealing area
The torque depends on the seal used. With standard G-type pipe thread, gauge
connection by means of a union nut or a LH-RH adjusting nut is recommended
to simplify correct orientation of the gauge. When a blow-out device is fitted to a
pressure gauge it shall be resistant to blocking by debris and dirt.
With safety pattern gauges (see dial symbol
fact that the free space behind the blow-out back will be at least 15 mm.
Requirements for the installation point
If the measuring point is not adequately stable a measuring instrument support
such as a bracket or flange should be used for fastening (and possibly via a
flexible capillary line). If the pressure gauge is exposed to vibration or pulsating
pressure or both, then a liquid filled pressure gauge may provide considerably
better performance and readability. Instruments should be protected against
coarse dirt and wide fluctuations in ambient temperature.
12
1)
Wrench surface

WIKA Operating instructions pressure gauges Model 4 with 831 per ATEX
Sealing of

the thread
) you need to pay attention to the
k
Installation with
spanner

shall

,