Safety Guidelines For Hazardous Locations - National Instruments NI 9375 Getting Started Manual

electrical supply system that powers equipment. This category is
for 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
signals or use for measurements within Measurement
Categories II, III, or IV.
Note
equivalent. These test and measurement circuits are not
intended for direct connection to the MAINS building
installations of Measurement Categories CAT II,
CAT III, or CAT IV.

Safety Guidelines for Hazardous Locations

The NI 9375 is suitable for use in Class I, Division 2, Groups A,
B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4
and Ex nA IIC T4 hazardous locations; and nonhazardous
locations only. Follow these guidelines if you are installing the
NI 9375 in a potentially explosive environment. Not following
these guidelines may result in serious injury or death.
Do not connect the NI 9375 with DSUB to
Measurement Categories CAT I and CAT O are
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