Service – KROHNE DK 46-47-48-800 ATEX II2G Ex i EN User Manual
Page 14
6
SERVICE
14
DK46 - DK800
www.krohne.com
08/2012 - 4000430903 AD DK46/800 II2G R04 en
Service
6.1 Maintenance
The variable area flowmeter does not require any maintenance under normal operating
conditions and when used for the intended purpose. Within the scope of checks required to be
carried out in hazardous areas to maintain systems in proper working order, the following visual
inspections should be carried out at regular intervals:
• Inspection of the housing, cable entries and incoming cables for signs of damage.
• Inspection of the measuring unit for leaks and signs of damage to the glass cone.
• Include the flowmeter in the periodic pressure testing of the process piping.
Depending on application, however, the measuring function may in unfavourable cases become
impaired through soiling of the measuring cone and/or float. The measuring unit should then be
cleaned as described in the Installation and Operating Instructions for the non-hazardous-duty
versions. In this connection, refer to the notes on dismantling.
6.2 Dismantling
Electrical connection
If at all possible, dismantling should be carried out after the flowmeter has been disconnected
from supply. If not possible, observe the boundary conditions for intrinsic safety (e.g. no
grounding or connection of different intrinsically safe circuits) during dismantling.
Process connections
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.
CAUTION!
Pressurized pipes to be depressurized before removing the flowmeter. Avoid uncontrolled
discharge of residual fluid from the measuring unit. Where environmentally critical products are
concerned, carefully decontaminate the wetted parts of the measuring tube after dismantling.
Removal and installation are the responsibility of the operator.
AD_DK46_800_II2G_R04_en_430903_PRT.book Page 14 Tuesday, August 21, 2012 9:47 AM