NI 9157/9159 Operating Instructions and Specifications
2
ni.com
Safety Guidelines
Operate the NI 9157/9159 only as described in these operating instructions.
Safety Guidelines for Hazardous Locations
The NI 9157/9159 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T4 hazardous locations; Class 1, Zone 2, AEx nA IIC T4 and Ex nA
IIC T4 hazardous locations; and nonhazardous locations only. Follow these
guidelines if you are installing the NI 9157/9159 in a potentially explosive
environment. Not following these guidelines may result in serious injury or
death.
Caution
Do
not
disconnect the power supply wires and connectors from the controller
unless power has been switched off.
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 IP 54
as defined by IEC 60529 and EN 60529.
Special Conditions for Hazardous Locations Use
in Europe
Some chassis have been evaluated as Ex nA IIC T4 equipment under
DEMKO Certificate No. 07 ATEX 0626664X. Each such chassis is marked
II 3G and is suitable for use in Zone 2 hazardous locations, in ambient
temperatures of 0
Ta
55 °C.
Special Conditions for Marine Applications
Some chassis 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 chassis.
Caution
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 to modules. Power supply and module cables must be
separated on opposite sides of the enclosure and must enter and exit through opposing
enclosure walls.
