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2. Safety
5. Temperature increase through compression warming
Avoid the increasing of warming due to gas-compression. In these cases it may
be necessary to throttle the rate of change of pressure or reduce the permissible
medium temperature.
6. Equipotential bonding
The instruments must be connected to the equipotential bonding of the plant via
the process connection by the end user in the end use application. Avoid use of
electric insulating sealing materials.
7. Handling of materials
Avoid exposure to substances or environment conditions that might affect the
materials of the instrument negatively. Avoid handling substances that are liable to
spontaneous combustion. For a list of the materials used, see chapter 3 "Specifi-
cations". The materials of wetted parts not listed there (e.g. Hastelloy) are noted
on the dial.
8. Permissible vibration load
The instruments should always be installed in locations free from vibration. If the
line to the instrument is not adequately stable, an instrument holder should be
used for fastening. 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 pressure gauge and mounting the instrument on a suitable bracket.
If vibrations cannot be avoided by means of suitable installation, instruments with
liquid filling should be used.
At the installation site
However, the following limit values must not be exceeded:
Frequency range: < 150 Hz
Acceleration: < 0.5 g (approx. 5 m/s
9. Cleaning
Clean the equipment with a moist cloth. Do not use other cleaning processes than
manual rubbing to prevent electrostatic charging.
10. Assessment of all accessory components
All accessories (e.g. valves or attachment components) must be assessed in
combination with the delivered instruments by the end user. Particularly the requi-
rements of grounding and prevention of electrostatic charges must be considered.
WIKA operating instructions pressure gauge model 4 per ATEX
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