SERVICE 5
23
VA FLOWMETERS
www.krohne.com09/2022 - 4000419908 - AD VA Mech Ex Gb-Db R08 en
5.1 Dismantling
Replacing the indicator
Due to the modular design of the variable area flowmeters with metal measuring units, from a
safety perspective it is possible to replace a complete indicator with an identical spare part.
Exchanging the entire device
The dismantling and installation is within the responsibility of the operator.
5.2 Maintenance
Maintenance work of a safety-relevant nature within the meaning of explosion protection may
only be carried out by the manufacturer, his authorised representative or under the supervision
of authorised inspectors.
For systems in hazardous areas, regular checks are required in order to maintain the proper
condi
tion.
The following checks are recommended:
• Check the housing for corrosion or damage.
• Check the measuring unit and the piping connections for leakage.
• Check the measuring unit and the indicator for dust deposits.
• Include the flowmeter in the periodic pressure test of the process line.
During re-assembly after maintenance of the indicator (or replacement) or the
flowmeter, the operator must take appropriate measures to ensure that
• no charge is applied to the surface of the housing.
• no charge is applied to the inner surfaces of the housing.
• any damaged gaskets are replaced.
The cover is to be closed following maintenance work on the M40 indicator.
CAUTION!
There may be a loss of measuring accuracy!
CAUTION!
•
Pressurised pipes have to be depressurised before removing the measuring unit.
•
In the case of environmentally critical or hazardous products, appropriate safety precautions
must be taken with regard to residual liquids in the measuring unit.
•
New gaskets have to be used when re-installing the device in the pipeline.
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