National Instruments NI 9411 Operating Instructions And Specifications page 22

Caution
for measurements within Measurement Categories II,
III, or IV.
Hazardous Locations
U.S. (UL) .......................................... Class I, Division 2,
Canada (C-UL) ................................. Class I, Division 2,
Europe (DEMKO)............................. Ex nC IIC T4
Safety Standards
This product meets the requirements of the following standards of
safety for electrical equipment for measurement, control, and
laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
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Do not connect the NI 9411 to signals or use
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nC IIC T4
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nC IIC T4
21 NI 9411 Operating Instructions and Specifications