Note
When module terminals are hazardous voltage LIVE (>42.4 V
pk
/
60 V DC), you must ensure that devices and circuits connected to the
module are properly insulated from human contact. You must use the
NI-9927 connector backshell kit with the NI-9474 with screw terminal and
the NI-9981 connector backshell kit with the NI-9474 with spring terminal
to ensure that the terminals are not accessible.
Safety Guidelines for Hazardous Locations
The NI-9474 is suitable for use in hazardous locations; , and hazardous locations;
and nonhazardous locations only. Follow these guidelines if you are installing the
NI-9474 in a potentially explosive environment. Not following these guidelines may
result in serious injury or death.
Caution
Do not disconnect I/O-side wires or connectors unless power has
been switched off or the area is known to be nonhazardous.
Caution
Do not remove modules unless power has been switched off or
the area is known to be nonhazardous.
Caution
Substitution of components may impair suitability for Class I,
Division 2, or Zone 2.
Caution
The system must be installed in an enclosure certified for the
intended hazardous (classified) location, having a tool secured cover/door,
where a minimum protection of at least IP54 is provided.
Special Conditions for Hazardous Locations Use in Europe and
Internationally
The NI-9474 has been evaluated as equipment under DEMKO ATEX and is IECEx
certified. Each NI-9474 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-9474
© National Instruments
5
NI-9474 Getting Started