KROHNE BM 70A EEx EN - Manual (Page 26)

07/2010 - 4000662402 MA BM70x-Ex-AD-R02-en www.krohne.com 26
6. Start-up
Check the following before initial start-up:
Check suitability of the materials used for the flange system (e.g. flange, gaskets and antenna)
for adequate corrosion resistance to the product.
Compare the data on the nameplates of the signal converter and flange with existing 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 purge 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 compartment 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 an 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.
If necessary the converter BM 702-Ex / BM 702 A-Ex may be opened.
Please note: when opening the housing no dirt and no humidity may enter into the housing and it must
be excluded, that the electronic will be damaged.
8. Preventive maintenance
8.1. Signal converter
The signal converter requires no maintenance under normal operating conditions and when ‘used as
prescribed’.
Should it prove necessary to open the flameproof enclosure of the electronics compartment in the
presence of an explosive atmosphere, first make sure that the device is disconnected from the supply.
Before opening the flameproof enclosure, be absolutely sure to allow the waiting time, specified on the
nameplate of the signal converter (22 minutes for BM 70..-Ex and 10 minutes for BM 700-Ex), to
elapse first.
Before connecting or disconnecting the device interconnecting cables, make sure that all cables
leading into the signal converter are isolated from ground (reference potential) of the hazardous
location. This also applies to safety conductors (PE) and equipotential bonding conductors (PA).
Exception: intrinsically safe operated converter of type BM 702-Ex / BM 702 A-Ex.
After any maintenance work has been carried out, be sure to grease the flameproof cover thread of
the signal converter including seals with a resin-free and acid-free all-purpose grease again.
Use the multi-purpose grease NONTRIBOS®, type Li EP2.
Within the scope of checks required to be carried out in hazardous locations to maintain systems in
proper working order, the following visual inspections should be carried out at regular intervals:
Inspection of the housing, cable entries and incoming cables for signs of corrosion and damage.
Inspection of the tank connections for leakages.