KROHNE BM 70A EEx EN - Manual (Page 18)

07/2010 - 4000662402 MA BM70x-Ex-AD-R02-en www.krohne.com 18
5. Assembly and installation
Assembly and installation shall, in accordance with the valid installation standards for hazardous
locations (e.g. EN 60079-14 / VDE 0165), be carried out by specialist personnel who have received
‘training in explosion protection’.
In this connection, take note of the information given in the Installation and Operating Instructions and
in these Supplementary Installation and Operating Instructions (‘Ex’) as well as the EC Type Test
Certificate (see Annex A.1).
Check the suitability of the level gauge by comparing the information given on the nameplate with that
given in Section 3.2.1 (Categories / Zone allocation), Section 2 (Type Code) and Section 4 (Identifying
marking).
Attention is drawn in particular to the following points.
5.1. Flange systems
5.1.1. Flange system V96
Install appropriately to avoid mechanical loads and sparking caused by blows at the antenna and the
extensions (e.g. by agitators).
5.1.1.1.
Flange system V96 with heating
The operator shall ensure that the temperature of the heating medium, when used in Zone 0 or 1, shall
not exceed 80% of the ignition temperature (in °C) of the products inside the tank, and shall not
exceed the maximum allowable flange temperature as a factor of the Temperature Class, see Section
3.2.1.
The pressure of the heating medium should not exceed 6 bar. In addition, make sure that inlet and
outlet are correctly connected when the system is operated (see information labels on the flange).
5.1.1.2.
Flange system V96 with purging system
The locking screw for the purging system, together with the screw thread of the tank mounting flange,
forms a flameproof joint when given at least five full turns. The quality grade of the thread of the
inserted screw is ‘medium’ in accordance with DIN 13 and ISO 965.
This screw must be removed before the purge connection can be used. But do not remove the screw
unless the tank is in non-pressurized condition. Adopt suitable measures to ensure that the purge
connection is fitted with a flame trap. Together with the thread in the tank mounting flange, the
connection screwed into the tank mounting flange must form a flameproof joint in conformity with
EN 60079-1 (note thread quality grade and threaded length).
The choice of a suitable purging medium and operation of the purge connection are the responsibility
of the operator.
When the purge connection is used, the operator shall ensure that no impermissible changes are
made to the process conditions (e.g. temperature, pressure, etc.).
5.1.1.3.
Flange system V96 with heating and purging devices
Please refer to the information given in Section 5.1.1.1 and 5.1.1.2.