WIKA PGS23 Mode D'emploi page 14

5. Commissioning, operation
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.
Installation
EN
Nominal position per EN 837-3 / 9.6.6 figure 7: 90° ( ⊥ )
„
Process connection lower mount
„
With filled 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
„
specified 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.
Requirements for the installation point
If the line to the measuring instrument is not adequately stable, an instrument mounting
bracket should be used for fastening. If vibrations cannot be avoided by means of suitable
installation, filled instruments should be used. The instruments should be protected against
coarse dirt and wide fluctuations in ambient temperature.
Permissible vibration load at the installation site
The instruments should always be installed in locations free from vibration. If necessary,
it is possible to isolate the instrument from the mounting point, e.g. by installing a flexible
connection line between the measuring point and the instrument and mounting the instru-
ment on a suitable bracket.
If this is not possible, the following limit values must not be exceeded:
Frequency range < 150 Hz
Acceleration < 0.5 g (5 m/s
Test connection
In specific applications (e.g. steam boilers) the shut-off fittings must have a test connection,
so that the instrument can be tested without being dismounted.
Temperature load
The installation of the instrument should be made in such a way that the permissible operat-
ing temperature, also considering the effects of convection and thermal radiation, neither
exceeds nor falls below the permissible limits. Thus the instrument and the shut-off device
must be protected by sufficiently long measuring lines or syphons.
The influence of temperature on the indication and measurement accuracy must be
observed.
14
)
2
Pressure gauges with inductive contact model 831, for hazardous areas