Operating Conditions - KROHNE BM 26 BASIC Supplementary Instructions Manual

LIMIT SWITCH
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3.1.4 Categories: Ex ia-approved devices
The Ex ia-approved device has the markings that follow:
II 1 GD
Ex ia IIC T4...T6* Ga
Ex ia IIIC T135°C...T85°C* Da
* The ambient temperature for the device must agree with the temperature class data on page
15.
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 IIA, IIB and IIC. It is certified for applications requiring
Category 1 G (gases, vapours or mists) and EPL Ga or Category 2 G and EPL Gb equipment. It
also agrees with temperature class T3, T2 and T1 (Gas Groups) if the temperature limits are
obeyed. For more data, refer to
Category 1 G equipment are used in zone 0. Category 2 G equipment are used in zone 1.
The Ex ia-approved device is suitable for use in potentially explosive atmospheres of all
flammable substances in Dust Groups IIIA, IIIB and IIIC. It is certified for applications requiring
Category 1 D (dust) and EPL Da or Category 2 D and EPL Db equipment, when fitted with the
appropriate options. The surface temperature of the housing (without a layer of dust) cannot be
more than +85°C / +185°F if no other heat is supplied from the measured process.
Category 1 D equipment are used in zone 20. Category 2 D equipment are used in zone 21.
The limit switch agrees with protection category IP6X for dust. The housing has an M16×1.5
plastic cable gland.
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Operating conditions

on page 15.
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BM 26 BASIC/ADVANCED
06/2016 - 4000347104 - AD ATEX BM 26 Bas-Adv R04 en