Publicidad
Idiomas disponibles
Idiomas disponibles
5. Commissioning, operation
■
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, instru-
ments with blow-out device or blow-out back must keep a minimum distance of
20 mm from each object.
5.1.2 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 tempera-
ture.
5.1.3 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 instru-
ment and mounting the instrument 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
5.1.4 Level check
For filled instruments, the level must be checked on a regular basis.
The liquid level must not drop below 75 % of the instrument diameter.
5.1.5 Manual reset of reed switch, model 851
In rare cases an actuation of the reed switches can occur due to an impermissibly
high shock or vibration. To reset the reed switches, it is necessary to move the
instrument pointer over the set switch point of the reed switch.
5.1.6 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.
Operating instructions pressure gauges with switch contact models 821, 851 or 830 E
2
)
EN
11
Publicidad
