KROHNE OPTIFLUX 2000-4000-5000-6000-7300-IFC 300 Ex EN - Manual (Page 37)

MAINTENANCE AND SERVICE
5
37
OPTIFLUX
www.krohne.com 07/2010 - 7309482600 - AD EX IFC 300 R06 en
5.1 Maintenance
The flowmeters are maintenance free with respect to the flowmetering properties. Within the
scope of periodic inspections required for electrical equipment installed in hazardous areas it is
recommended to check the housing for signs of damage or corrosion.
This is especially important for following Ex d flowsensor housings:
• OPTIFLUX 2300 C or 4300 C, sizes DN25...150
• OPTIFLUX 5300 C, sizes DN25...100
• OPTIFLUX 7300 SW/C, sizes DN25...100
• In case of replacement of one (or more) of the four M6 hexagon socket head cap screws with
wich the IFC converter housing is connected tot the OPTIFLUX 7000 flowmeter, equivalent
types must be used, that are M6x16 hexagon socket head cap screws to EN ISO 4762, steel
quality A2-70 or A4-70.
• If needed, contact the manufacturer for information on the dimensions of the flameproof
joints.
5.2 Before and after opening
Before opening:
• Make absolutely sure that there is no explosion hazard!
• Gas-free certificate!
• Make sure that all connecting cables are safely isolated from all external sources!
• Allow the elctronics to de-energize before opening the electronics compartment of the
converter housing. Wait at least 35 minutes for T6 and 10 minutes for T5 before opening.
When the instructions above are strictly followed, the display cover (includes glass window) of
the electronics compartment may be removed. First unscrew the head screw with internal
hexagon socket set (size M4) of the interlocking device by a No. 3 Allen key, until the cover can
rotate freely.
After opening:
• Before the cover is screwed back onto the housing, the screw-thread must be clean and well-
greased with an acid and resin-free grease, e.g. PTFE grease.
• Screw the cover as tight as possible into the housing by hand, until it cannot be opened by
hand anymore. Fixate the screw of the interlocking device tight with the No. 3 Allen key.
WARNING!
the following instructions must always be carefully followed, if the housing of the signal
converter has to be opened respectively closed again.