WIKA 632.51 Betriebsanleitung Seite 12

6. Commissioning, operation
The tightening 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 a instrument, it must be
protected against being blocked by debris and dirt.
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
EN
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 image 7: 90° ( ⊥ ), if not stated otherwise in the
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order documentation.
Process connection lower mount
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For filled versions, it must be ensured that a case filling which escapes in the event of
„
a fault cannot reach system parts whose surface temperature exceeds the maximum
permissible medium temperature of the instrument.
For outdoor applications, the selected installation location has to be suitable for the
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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
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solar irradiation while in operation!
To ensure that the pressure can be safely vented in the case of failure, instruments with
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blow-out device or blow-out back must keep a minimum distance of 20 mm from each
object.
Permissible ambient and operating temperatures
When mounting the instrument it must be ensured that, taking into consideration the influ-
ence 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 accura-
cy 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
temperature 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.
12 WIKA operating instructions pressure gauge, model 632.51 per ATEX