For most non-voltage producing devices located in a hazardous
area, a single zener barrier that is negative-earth-grounded can
be used for intrinsic safety. Instrumentation that produces an
output (signal conditioners) usually requires two barriers, one for
each "floating" lead. Here, a dual-channel barrier can be provided
or for applications in which the instrument signal return level cannot
be reduced, a supply barrier and a low resistance return barrier can be
supplied.
Approvals: UL, CSA
Classes: I, II
Divisions: 1, 2*
Hazardous Location Group D
* Certified by CSA for mounting inside a suitable enclosure in Div. 2
or non-hazardous locations and must be connected by means of the
two studs provided to a grounded copper busbar or equivalent.
