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GENERAL SAFETY INFORMATION
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OPTIWAVE-M 7400
www.krohne.com
10/2018 - 4007039501 - AD ATEX OPTIWAVE-M 7400 R01a
1.4 Device categories
The device has the markings that follow:
PP Drop antenna
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II 1/2 G Ex ia IIC T6...T5 Ga/Gb
All other versions
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II 1/2 G Ex ia IIC T6...T3 Ga/Gb
The device is suitable for use in potentially explosive atmospheres of all flammable substances
in Gas Groups IIA, IIB and IIC. It is certified for applications requiring Category 1/2 G and
EPL Ga/Gb or Category 2 G and EPL Gb equipment, when fitted with the appropriate options. It
agrees with temperature classes T6 thru T1 (Gas Groups) if the temperature limits are obeyed.
For more data, refer to
Ambient and process connection temperatures
on page 8.
Category 1/2 G equipment is used in zone 0, but it is installed in the boundary wall between zone
0 and zone 1 (the antenna is in zone 0 and the signal converter is in zone 1). Category 2 G
equipment is used in zone 1.
WARNING!
Make sure that the installation of the device between zone 0 and zone 1 agrees with
EN 60079-26.
