National Instruments 9221 User Manual

© National Instruments Corp.

locations. If you are using the NI 9201/9221 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.

Some modules are Lloyd’s Register (LR) Type Approved for 
marine applications. To verify Lloyd’s Register certification, visit 

ni.com/certification

 and search for the LR certificate, or 

look for the Lloyd’s Register mark on the module.

To meet radio frequency emission requirements 

for marine applications, use shielded cables and install 
the system in a metal enclosure. Suppression ferrites 
must be installed on power supply inputs near power 
entries to modules and controllers. Power supply and 
module cables must be separated on opposite sides of the 
enclosure and must enter and exit through opposing 
enclosure walls.