Emerson 781S - Reference Data

7 Reference data
For information on product specs, dimensional drawings, ordering
information or the complete reference manual, see Emerson.com.
Figure 7-1: Hazardous Location Installation
Option N:
Ex
No intrinsically safe
(IS) outputs, for
installation in safe
areas only
Option B
Ex [ic]
IS output for 781
installation in Zone
2/Cl1 Div 2
Option A:
Ex ex ec [ia]
IS output for 781
installation in Zone 0,
1+2 / Cl1 Div 1+2
(31ES-781S in Zone 1
or 2)
Option N:
External IS outputs
(24 Vdc and RS-485)
for installation of
1410S in safe areas
only: 781S may be
installed in Zone 2, 1,
or 0 (Cl1 Div 2/1)
October 2020 Quick Start Guide
Quick Start Guide 23