Limit Switch; General Safety Information; Scope; Device Description - KROHNE BM 26 BASIC Supplementary Instructions Manual

LIMIT SWITCH

2

2.1 General safety information

2.1.1 Scope

These instructions are applicable only to the explosion-protection version of the bistable limit
switch. For all other data, use the Quick Start and Handbook for the magnetic level indicator. If
you do not have these documents, please contact the nearest sales office or download them
from the website www.krohne.com.
WARNING!
Installation, commissioning and maintenance may only be carried out by "Personnel trained in
explosion protection".
WARNING!
The information in this chapter only contains Ex data applicable to the limit switch. For more
data on use of this option with the measuring chamber, refer to Assembled equipment on page
21
.
INFORMATION!
The information in this ATEX supplement only contains the data applicable to explosion
protection. The technical data in the handbook for the non-Ex version shall be valid in its current
version, provided that they are not rendered invalid or are replaced by this ATEX supplement.

2.1.2 Device description

The limit switch uses a bistable reed switch to detect the level of the liquid. It is attached
adjacent to the measuring chamber of the magnetic level indicator.
This accessory is approved for use in potentially explosive atmospheres when equipped with the
appropriate options.

2.1.3 Standards and approvals

DANGER!
In compliance with European Directive 94 / 9 / EC (ATEX 100a), the ATEX versions of the limit
switch described in these Supplementary Instructions conform to European Standards
EN 60079-0:2006, EN 60079-11:2007, EN 60079-26:2004. The Ex ia version is certified for use in
hazardous areas by INERIS under INERIS 08ATEX0045 X.
WARNING!
Carefully read the ATEX approval certificate for the limit switch. Obey the boundary conditions.

2.1.4 Categories

The limit switch is designed for ATEX applications when the appropriate options are selected
(type code *F40**1**).The limit switch is suitable for use in potentially explosive atmospheres of
all flammable substances in Gas Group II.
INFORMATION!
Category 1 Category 1
Category 1 Category 1
The device is installed in hazardous areas requiring Category 1 G equipment.
10 www.krohne.com 12/2011 - 4000347102 - AD ATEX BM 26 Bas-Adv R02 en
BM 26 BASIC/ADVANCED