SERVICE
6
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DK37/M8 - H250/M8
www.krohne.com
11/2017 - 4002616802 - AD DK37 NEPSI Ex ia R02 en
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 checks are required in order to maintain the proper
condition.
The following checks are recommended:
•
Check the housing, the cable entries and the feed lines for corrosion and/or damage.
•
Checking the piping connections and the measuring unit as well as the needle valve, if
necessary, for leakage.
•
Include the flowmeter in the regular pressure testing of the process line.
The cover is to be closed following maintenance work on the signal converter.
6.2 Dismantling
Replacing the display
Replacing the display
Replacing the display
Replacing the display
Due to the modular design of the variable area flowmeters, from a safety perspective the
complete display can be replaced with identical spare parts.
Exchanging the entire device
Exchanging the entire device
Exchanging the entire device
Exchanging the entire device
The dismantling and installation is within the responsibility of the operator.
Exchanging and dismantling should take place in a de-energised state, if at all possible. If this is
not possible, the basic conditions for intrinsic safety (e.g. no grounding or connection of different
intrinsically safe circuits to one another) must be observed during dismantling.
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 piping.
