Emerson Rosemount 935 Quick Start Manual page 10

Quick Start Guide
1.4 Special conditions for safe use from ATEX IECEx
certificate
The dimensions of the flameproof joints differ from the relevant minimum
or maximum values required by Table 2 of IEC/EN 60079-1: 2007 for IIB + H
as detailed in
Table 1-3: Flamepaths
Flamepath
description
Cylindrical section of
spigot (both ends of
Ex d compartment)
1.2-in. (30 mm)
diameter window
fitted against
enclosure
1.6-in. (39.5 mm)
diameter window
fitted against
enclosure
• Gaps, "i
not be modified to be any shorter than the values in
• Connections to the intrinsically safe (I.S.) port on the side of the detector
enclosure should be made using equipment that maintains the
intrinsically safe levels of protection.
• The Um should be installed in accordance with one of the following:
— The Um is 18 to 32 Vdc in a SELV/PELV system.
— Via a safety isolating transformer, complying with the requirements
of IEC 61588-2-6 or technically equivalent standard.
— Directly connected to apparatus, complying with IEC 60950, IEC
61010-1, or technically equivalent standard.
— Fed directly from cells or batteries.
• If the product is to be used as a safety related device, an appropriate
independent certification, would be required meeting all the
requirements.
10
Table 1-3.
Type of joint
Cylindrical
Flanged
Flanged
", should not be modified to be any larger, and widths, "L", should
c
Minimum width "L"
in inches
(millimeters)
0.59 (15)
0.42 (10.7)
0.39 (10)
April 2021
Maximum gap "i " in
c
inches (millimeters)
0.003 (0.08)
0.001 (0.02)
0.001 (0.02)
Table 1-3.
Emerson.com/Rosemount
,
2