INSTALLATION 3
17
VA FLOWMETERS
www.krohne.com09/2022 - 4000419908 - AD VA Mech Ex Gb-Db R08 en
3.1 Mounting
Mounting and setup must be carried out according to the applicable installation standards by
qualified personnel trained in explosion protection.
The information given in the manual and the supplementary instructions must always be
observed.
Variable area flowmeters must be installed in such a way that
• there is no danger from mechanical impact effects.
• there are no external forces affecting the indicator part.
• the device is accessible for any necessary visual inspections and can be viewed from all sides.
• the nameplate is clearly visible.
• it can be operated from a location with secure footing.
3.2 Special conditions
Equipotential bonding
Variable area flowmeters must be included in the equipotential bonding of the hazardous area.
For further information refer to
Grounding and equipotential bonding
on page 18.
Electrostatics
If the installation takes place in hazardous areas of group IIC, the instructions for electrostatics
must be observed.
For further information refer to
Static electricity
on page 21.
Mechanical tests
All-metal design:
Variable area flowmeters are tested on measuring units, optional valves and controllers for
shock resistance with 4 Joules in accordance with ISO 80079-36 for device group II with a low
degre
e of mechanical risk. The sight glass is not tested on all-metal variable area flowmeters.
The integrity of the sight glass is not relevant to explosion protection on these devices. If the
degree of mechanical risk is higher, additional protective measures must be taken on-site.
Glass devices:
Variable area flowmeters are tested on measuring units, transparent sight glasses and
contr
ollers and protective covers for shock resistance with 4 or 2 Joules in accordance with
ISO 80
079-36 for device group II with a low degree of mechanical risk. If the degree of
mechanical risk is higher, additional protective measures must be taken on-site.
CAUTION!
The manufacturer is not liable for any damage resulting from improper use or use other than the
intended purpose. This applies in particular to hazards due to insufficient corrosion resistance
and suitability of the materials in contact with product.
DANGER!
Components made of titanium in oxygen applications
Variable area flowmeters with titanium components are NOT suitable for use in explosion-
prote
cted areas in conjunction with oxygen applications (products with an oxygen content which
is significantly above the oxygen content in the earth's atmosphere)!
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