National Instruments NI 9375 Getting Started Manual page 7

IECEx UL 14.0089X certified. Each NI 9375 is marked
and is suitable for use in Zone 2 hazardous locations, in ambient
temperatures of -40 °C ≤ Ta ≤ 70 °C. If you are using the NI 9375
in Gas Group IIC hazardous locations, you must use the device in
an NI chassis that has been evaluated as Ex nC IIC T4, Ex IIC
T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
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You must make sure that transient
Caution
disturbances do not exceed 140% of the rated voltage.
The system shall only be used in an area of
Caution
not more than Pollution Degree 2, as defined in
IEC 60664-1.
The system shall be mounted in an
Caution
ATEX/IECEx-certified enclosure with a minimum
ingress protection rating of at least IP54 as defined in
IEC/EN 60079-15.
The enclosure must have a door or cover
Caution
accessible only by the use of a tool.
II 3G