WIKA 432.36 - Manual (Page 10)

10
2080276.04 12/2010 GB/D/F/E
GB
WIKA operating instructions pressure gauge model 4 per ATEX
Requirements for the installation point
If the line to the measuring instrument is not adequately stable, a measuring
instrument holder should be used for fastening. If vibrations cannot be avoided
by means of suitable installation, instruments with liquid filling should be used.
The instruments should be protected against coarse dirt and wide fluctuations in
ambient temperature.
Installation
„ Nominal position per EN 837-3 / 9.6.6 Figure 7: 90° ( ⊥ )
„
Process connection lower mount (LM)
„
In order to avoid any additional heating, the instruments must not be exposed
to direct solar irradiation while in operation!
„ With filled versions the vent valve at the top of the case must be opened before
commissioning!
Permissible ambient and operating temperatures
When mounting the pressure gauge it must be ensured that, taking into
consideration the influence of convection and heat radiation, no deviation above
or below the permissible ambient and medium temperatures can occur. The
influence of temperature on the indication accuracy must be observed.
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
by installing a flexible connection line between the measuring point and the
pressure gauge and mounting the instrument on a suitable bracket.
„
If this is not possible, the following limit values must not be exceeded:
Dry gauges:
Frequency range < 150 Hz
(Model 432) Acceleration < 0.7 g (7 m/s 2 )
Liquid-filled gauges: Frequency range < 150 Hz
(Model 433) Acceleration < 4 g (40 m/s 2 )
The liquid filling must be checked on a regular basis.
The liquid level must not drop below 75 % of the gauge diameter.
6. Commissioning, operation