NI 9426 Operating Instructions and Specifications
4
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Ex nA IIC T4 hazardo
u
s locations; and nonhazardo
u
s locations
only. Follow these g
u
idelines if yo
u
are installing the NI 9426 in a
potentially explosive environment. Not following these g
u
idelines
may res
u
lt in serio
u
s inj
u
ry or death.
Caution
Do
not
disconnect I/O-side wires or connectors
u
nless power has been switched off or the area is known
to be nonhazardo
u
s.
Caution
Do
not
remove mod
u
les
u
nless power has been
switched off or the area is known to be nonhazardo
u
s.
Caution
S
u
bstit
u
tion of components may impair
s
u
itability for Class I, Division 2.
Caution
For Zone 2 applications, install the system
in an enclos
u
re rated to at least IP 54 as defined by
IEC 60529 and EN 60529.
Caution
For Zone 2 applications, install a protection
device that prevents the V
s
u
p
voltage from exceeding
42 V if there is a transient overvoltage condition.
