Service, Service 6.1 maintenance, 2 dismantling – KROHNE DK 37-H250 M8 ATEX II2G Ex i EN User Manual

Page 15

SERVICE

DK37/M8 - H250/M8

www.krohne.com

09/2013 - 4000760402 MA DK37 M8 AD II2G R02 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:

• Inspection of the housing, the cable entries and the feed lines for corrosion and damage.
• Checking the piping connections and the measuring unit as well as the needle valve, if

necessary, for leaks.

• 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 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.

Any replacement and removal should take place in a de-energized state if possible. If that 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!
•

Pressurized pipes to be depressurized before removing the flowmeter.

•

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 seals must be used when re-installing the device in the piping.

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