KROHNE BM 70 M - Manual (Page 99)

BM 70M-EEx/ BM 70Mi-EEx 13
6 Initial start-up
Check the following before initial start-up:
• Verify suitability of the materials used for the flange system (e.g. flange, antennas, gaskets)
for adequate resistance to corrosion from the tank product.
•
Compare the data on the nameplates of the signal converter and flange with actual operating
data.
•
Check that signal converter and flange system are properly assembled.
• Check that the level gauge is properly mounted on the tank, including any optional
equipment
such as purging and/or heating system, and the signal converter.
• Check that the equipotential bonding system is properly connected.
•
Check the connection for supply power and I/O functions.
• Check that the covers of the terminal and electronics compartments are firmly in place, that
special locks have been tightened down.
7 Operation
Do not open the covers of terminal compartment and electronics compartment during operation
in the presence of a potentially explosive atmosphere.
Should parameterization of the device become necessary in the presence of an explosive
atmosphere, this can be done by using the supplied programming bar magnet and applying it to
the glass window of the electronics compartment, without opening the housing, or digitally via
the signal output.
8 Preventive maintenance
8.1 Signal Converter
The signal converter is maintenance-free under normal operating conditions and when used for
the intended purpose.
Caution:
If any cleaning is required, avoid build-up of electrostatic charge, e.g. through
friction.
Should it prove necessary to open the flameproof enclosure of the electronics compartment in
the presence of a potentially explosive atmosphere, make sure that the device is disconnected
from supply. Before opening the Flameproof Enclosure, be absolutely sure to allow the waiting
time specified on the nameplate of the converter (27 minutes) to elapse first.
Should it prove necessary to open the flameproof enclosure of the electronics compartment in
the presence of a potentially explosive atmosphere, make sure that the device is disconnected
from supply. Before opening the Flameproof Enclosure, be absolutely sure to allow the waiting
time specified on the nameplate of the converter (27 minutes) to elapse first.
Before connecting or disconnecting the device interconnecting cables, make sure that all cables
leading into the signal converter are isolated from the ground (reference potential) of the
hazardous area. This also applies to safety conductors (PE) and equipotential bonding
conductors (PA).