NI 9237 Operating Instructions and Specifications 4 ni.com
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Zone 2 applications, install the system
in an enclosure rated to at least IP54 as defined by
IEC60529 and EN 60529.
Caution For Zone 2 applications, connected signals must
be within the following limits:
Capacitance.......................... 0.2 μF max
Inductance............................ 80 mH max
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as EExnC IIC T4 equipment
under DEMKO Certificate No. 03 ATEX 0324020X. Each module
is marked II 3G and is suitable for use in Zone 2 hazardous
locations. If you are using the NI9237 in Gas Group IIC hazardous
locations or in ambient temperatures of –40°C ≤Ta ≤70 °C, you
must use the device in an NI chassis that has been evaluated as
EExnC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.