National-instruments 24-Bit Half/Full-Bridge Analog Input Module NI 923 User Manual download pdf (Page 29)

measurements of voltages from specially protected secondary

circuits. Such voltage measurements include signal levels, special

equipment, limited-energy parts of equipment, circuits powered by

regulated low-voltage sources, and electronics.

Caution Do not connect the NI 9237 to signals or use for

measurements within Measurement Categories II,

III, or IV.

Hazardous Locations

U.S. (UL) .......................................... Class I, Division 2,

Groups A, B, C, D, T4;

Class I, Zone 2,

AEx nC IIC T4

Canada (C-UL) ................................. Class I, Division 2,

Groups A, B, C, D, T4;

Class I, Zone 2,

Ex nC IIC T4

Europe (DEMKO)............................. EEx nC IIC T4

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National-instruments 24-Bit Half/Full-Bridge Analog Input Module NI 923 User Manual Page 29