Emerson Rosemount 935, Reference Manual

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• The certification of this equipment relies upon the following materials used in its
construction:
— Enclosure: Stainless steel 316
— Windows: sapphire glass
— Seals: EPDM
• If the equipment is likely to come into contact with aggressive substances, then it is
your responsibility to take suitable precautions that prevent it from being adversely
affected, thus ensuring that the type of protection provided by the equipment is not
compromised.
— Aggressive substances: For example, acidic liquids or gases that may attack metal or
solvents that may affect polymeric materials.
— Suitable precautions: For example, regular checks as part of routine inspections or
establishing from the material's safety data sheets that it is resistant to specific
chemicals.
4.5 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
2
, as detailed in Table 4-3 .
Table 4-3: Flamepaths
Flamepath description Type of joint Minimum width "L" Maximum gap "i
c
"
Cylindrical section of spigot
(both ends of Ex d
compartment) Cylindrical 0.59 in (15 mm) 0.003 in (0.1 mm)
1.2 in (30 mm) diameter
window fitted against
enclosure Flanged 0.42 in (11 mm) 0.001 in (0.03 mm)
1.6 in (39.5 mm) diameter
window fitted against
enclosure Flanged 0.39 in (10 mm) 0.001 in (0.03 mm)
• Gaps, "i
c
", should not be modified to be any larger, and widths, "L", should not be
modified to be any shorter than the values in Table 4-3 .
• 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.
Installation Reference Manual
May 2022 00809-0100-4035
28 Emerson.com/Rosemount