KROHNE DK 32-DK 34 NEPSI Ex nA - Manual (Page 12)

6
SERVICE
12
DK32 DK34
www.krohne.com 05/2013 - 4002598301 AD DK32/34 NEPSI Ex nA R01 en
Service
6.1 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 tests are required in order to maintain the proper
condition.
The following checks are recommended:
• Checking the housing, the cable entries and the feed lines for corrosion and/or damage.
• Checking the measuring unit and the piping connections for leakage.
The cover is to be closed following maintenance work on the display unit.
6.2 Dismantling
Replacing the display part
Due to the modular design of the variable area flowmeter, it is possible to replace a complete
display with an identical spare part in accordance with safety guidelines.
Exchanging the entire device
Removal and installation are the responsibility of the operator.
Before disconnecting the electric connecting cable of the device, make sure that all cables
leading to the indication unit are isolated from the ground of the hazardous area. This also
applies to functional earthing conductors (FE) and equipotential bonding conductors (PA).
CAUTION!
There may be a loss of measuring accuracy!
CAUTION!
•
Pressurized pipes have to be depressurized 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 piping.
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