OPERATION 4
21
VA FLOWMETERS
www.krohne.com09/2022 - 4000419908 - AD VA Mech Ex Gb-Db R08 en
4.1 Start-up
Make the following checks before starting up the device:
• Check that it has been correctly mounted and connected to the system.
• Check that it is in proper state with regard to the installation requirements.
• Suitability of the materials used for the measuring unit and for the gaskets for adequate
resistance to corrosion from the product.
The operator of the system has to check prior to start-up, if the start-up was in compliance with
the n
ational regulations for checks.
4.2 Operation
Variable area flowmeters must be operated in such a way that they remain within the maximum
and minimum permissible temperatures and pressures.
Variable area flowmeters may only be operated if the equipment parts necessary for safety are
effec
tive in the long run, and are not rendered inoperable during operation.
In case of flammable products the measuring units must be included in the periodic pressure
tests
of the system.
4.3 Static electricity
4.3.1 Electrostatic charge caused by ambient conditions
In order to avoid ignition hazards due to electrostatic charge, variable area flowmeters
may not be used in areas with:
• processes that generate strong charges,
• mechanical friction and cutting processes,
• spraying of electrons (e.g. in the vicinity of electrostatic painting systems) or
• pneumatically conveyed dust is exposed.
WARNING!
Avoid ignition risks caused by pressure surges, impact or friction, particularly when using
titan
ium measuring units (material number 3.7025, 3.7035 or 3.7055 on pressurised parts).
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