National Instruments 8-Channel Solid-State Relay (SSR) Digital Output NI 9485 - Manual (Page 5)

© National Instruments Corp. 5 NI 9485 Operating Instructions
Caution Do not disconnect I/O-side wires or connectors
unless power has been switched off or the area is known
to be nonhazardous.
Caution Do not remove modules unless power has been
switched off or the area is known to be nonhazardous.
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.
Caution For Zone 2 applications, install a protection
device across the positive and negative terminals of the
external power supply (or supplies). The device must
prevent the external power supply from exceeding
80 V if there is a transient overvoltage condition.