National Instruments NI 9411 Operating Instructions And Specifications page 5

Caution
suitability for Class I, Division 2.
Caution
in an enclosure rated to at least IP 54 as defined by
IEC 60529 and EN 60529.
Caution
device between the V
The device must prevent the V
exceeding 42 V if there is a transient overvoltage
condition.
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as Ex nC IIC T4 equipment
under DEMKO Certificate No. 03 ATEX 0324020X. Each module
is marked
locations, in ambient temperatures of –40 °C  Ta  70 °C. If you
are using the NI 9411 in Gas Group IIC hazardous locations, you
must use the device in an NI chassis that has been evaluated as
Ex nC IIC T4, EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4
equipment.
NI 9411 Operating Instructions and Specifications
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Substitution of components may impair
For Zone 2 applications, install the system
For Zone 2 applications, install a protection
terminal and the COM terminal.
sup
-to-COM voltage from
sup
II 3G and is suitable for use in Zone 2 hazardous
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