KROHNE OPTISWIRL 4070 ATEX II2G EN - Manual (Page 17)

SERVICE
6
17
OPTISWIRL 4070
www.krohne.com 04/2013 - 4000077105 MA OPTISWIRL4070 II2G AD R05 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 conduit entry/entries and the feed lines for corrosion and/or
damage.
• Checking the measuring section and the piping connections for leaks.
• Checking the measuring section 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.
Any replacement or dismantling 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.
After opening the converter, grease the flameproof threaded joints of the converter´s cover
including the cover seals if necessary. Use the multi-purpose grease NONTRIBOS
® , type Li EP2.
Display
The display can be freely rotated in 90° increments. It is connected to the connector pictured on
the next page. The device should be de-energised before opening the flameproof enclosure.
Observe warning without fail.
Exchanging the device insert
It is permitted to replace a complete device insert VFC070 with a version constructed in the same
way.
CAUTION!
If it is absolutely necessary to open the flameproof enclosure of the electronics compartment in
the presence of a potentially explosive atmosphere, the device must be de-energised.
Strictly observe the 1 minute waiting time prior to opening the flameproof enclosure. This is
indicated on the nameplate of the converter for temperature classes T6 and T5.
The waiting period is not necessary for any of the other temperature classes.
AD_OPTISWIRL4070_II2G_R05_en_077105_PRT.book Page 17 Tuesday, April 23, 2013 2:17 PM