6
SERVICE
18
OPTISWIRL 4070
www.krohne.com
05/2016 - 4001268803 - AD OPTISWIRL 4070C Ex-II3G R04
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.
•
Checking the measuring unit and the indicator for dust deposits.
6.2 Dismantling
General notes
The cover must be opened using a suitable tool (e.g. strap wrench) to avoid damage to the cover.
If at all possible, the meter should be electrically isolated before removing and replacing the
indicator. 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.
After opening the converter, grease the converter's cover threads including the cover seals if
necessary.
Display
The display can be rotated in 90
°
increments. It is connected to the connector pictured on the
next page.
Exchanging the converter insert
It is permitted to replace the entire VFC070 signal converter insert with a version identical in
construction.
CAUTION!
Converter inserts operated with non-intrinsically safe power supplies may not be installed in
equipment belonging to equipment category II 2 G.
