National Instruments NI 9233 User Manual

Substitution of components may impair 

suitability for Class I, Division 2.

For Zone 2 applications, install the system 

in an enclosure rated to at least IP 54 as defined by 
IEC 60529 and EN 60529.

For Zone 2 applications, connected signals must 

be within the following limit:

Capacitance .......................... 0.2 

μF max

This equipment has been evaluated as EEx nC 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 NI 9233 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 
EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.