National Instruments 9201 用户手册

Do not disconnect I/O-side wires or connectors 

unless power has been switched off or the area is known 
to be nonhazardous.

Do not remove modules unless power has been 

switched off or the area is known to be nonhazardous.

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, install a protection 

device between the input signal and the NI 9201/9221 
input terminal. The device must prevent the input 
channel-to-COM voltage from exceeding 85 V if there is 
a transient overvoltage condition.

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