KROHNE BM 100A ATEX EN - Manual (Page 5)

Section 1 – Main safety-relevant characteristics
10/2001 BM 100 A ATEX 5
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1.1 Approved categories
1.1.1 1/2 G and 1/2 D
The signal converter is installed in hazardous locations requiring Category 2 G or 2 D equipment.
The probe is installed in hazardous locations requiring Category 1 G or 1 D equipment. The
devices are suitable for use in explosive atmospheres of all flammable substances of Gas Group
IIA, IIB and IIC.
Please take note of the following exceptions:
•
Plastic-coated probes may not be used in connection with Gas Group IIC substances.
•
Devices with plastic-coated probes may not be used for applications requiring Category 1/2 D
equipment, unless effective measures have been taken to avoid electrostatic discharge.
1.1.2 2 G and 2 D
BM 100 A level gauges are installed in areas requiring Category 2 G or 2 D equipment. The
devices are suitable for use in explosive atmospheres of all combustible substances of Gas Group
IIA, IIB and IIC.
Please take note of the following exceptions:
•
Plastic-coated probes may not be used in connection with substances of Gas Group IIC.
•
Devices with plastic-coated probes may not be used for applications requiring Category 2 D
equipment, unless effective measures have been taken to avoid electrostatic discharge.
1.2 Electrical limits
1.2.1 Intrinsically safe I/O functions
Intrinsically safe circuits for I/O functions of the BM 100 A are safety-separated from ground and
also from each other (test voltage > 500 V AC). In addition, all intrinsically safe circuits are safety-
separated from the non-intrinsically safe power circuits up to a peak voltage of 375 V.
Only certified intrinsically safe equipment with EEx ia IIC type of protection may be connected to
the I/O output circuits. This requirement applies independent of the required category and also in
cases where the device is not operated in the hazardous location.