KROHNE IFC 110 Converter - Manual (Page 56)

Sect. 6.1 Part C Special applications, functional checks, service, and order numbers
56 IFC 110 F 05/2003
6.1.3 Installation
and electrical connection
Type IFC 110 F - EEx signal converters are type tested as associated electrical apparatus.
They are installed outside the hazardous area.
The PE/PA connection (housing) must have protective bonding with the potential of the hazardous
area (PA).
Insulation ratings
The insulation of signal converters Type IFC 110 F - EEx is rated in conformity with
VDE 0110-1, equivalent to IEC 664-1, and the following rated values have been taken
into consideration:
• overvoltage category for the line circuit: III
• overvoltage category for the signal and measuring circuits: II
• insulation pollution degree: 2
Important, please note without fail!
• The buffer barrier for the intrinsically safe electrode circuit is an integral part of the
IFC 110 F - EEx signal converter and is safety galvanically isolated.
• The cable entry for the interconnecting cable of the intrinsically safe electrode circuit
is marked in light blue.
• The terminals of the intrinsically safe electrode circuit may only be connected to
intrinsically safe circuits, even if the device is operated in the non-hazardous area.
• Electrical connection between front panel and potential to ground to be made by
way of the fastening screws on the front panel. These must therefore always be
properly tightened down (torque approx. 1.3 Nm).
Start-up
Check the following points before starting up:
• that the line voltage (power supply) agrees with the details given on the nameplate.
• that the nominal value of the fuse for field current protection agrees with the maximum
permissible nominal value specified for the flow sensor.
Evidence shall be furnished of the intrinsic safety for the electrode circuit together with the safety-
relevant data of the interconnecting cable and of the flow sensor.
Operation
Operator control of the signal converter is permitted during operation. For this purpose, remove
the cover of the electronic compartment. Definitely avoid ingress of dirt and moisture when the
housing cover is open.
Preventive maintenance
The signal converter does not require any maintenance 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, visual inspection of the housing, cable entries and interconnecting cables
for signs of damage should be carried out at regular intervals.
Maintenance
Maintenance work of a safety-relevant nature within the meaning of explosion protection may only
be carried out by the manufacturer, his authorized representative or under the supervision of
authorized inspectors.
Please note !
Safety data see Sect. 10.1 !