WIKA PGS23 Betriebsanleitung Seite 14

5. Commissioning, operation
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.
EN
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.
WARNING!
The actual maximum surface temperature depends not on the equipment itself,
but mainly on the operating conditions. With gaseous substances, the tempera-
ture may increase as a result of compression warming. In these cases it may be
necessary to throttle the rate of change of pressure or reduce the permissible
medium temperature.
Commissioning of pressure compensating valve
Instruments which are fitted with a pressure compensating valve
must, following installation, be vented for internal pressure compen-
sation.
Tool: Open-ended spanner SW 9
1. Remove plastic cap
2. Loosen the threaded connection above the valve body
3. Screw the valve body tight, turned through 180°, with ≤ 4.5 Nm
For information on the ingress protection, see Technical information IN 00.18
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Pressure gauges with inductive contact model 831, for hazardous areas
Before commissioning
After commissioning