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6/08 ST 3000 Release 300 and SFC Model STS103 User’s Manual 47
4.4 Wiring ST 3000 Transmitter, Continued
Process Sealing
Explosionproof
Conduit seal
The ST 3000, Series 100, 100e, 600, and 900, Smart Pressure
Transmitters are CSA certified as “Dual Seal” devices in accordance
with ANSI/ISA–12.27.01–2003, Requirements for Process Sealing
between Electrical Systems and Flammable or Combustible Process
Fluids.
Transmitters installed as explosionproof in a Class I, Division 1, Group
A Hazardous (Classified) Location in accordance with ANSI/NFPA 70,
the US National Electrical Code (NEC), require a “LISTED”
explosionproof seal to be installed in the conduit, within 18 inches of
the transmitter. Crouse-Hinds® type EYS/EYD or EYSX/EYDX are
examples of “LISTED” explosionproof seals that meets this
requirement.
Transmitters installed as explosionproof in a Class I, Division 1, Group
B, C or D Hazardous (Classified) Locations do not require an
explosionproof seal to be installed in the conduit.
NOTE: Installation should conform to all national and local electrical
code requirements.
WARNING
When installed as explosionproof in a Division 1 Hazardous Location,
keep covers tight while the transmitter is energized. Disconnect power
to the transmitter in the non-hazardous area prior to removing end caps
for service.
When installed as nonincendive equipment in a Division 2 Hazardous
Location, disconnect power to the transmitter in the non-hazardous area,
or determine that the location is non-hazardous prior to disconnecting or
connecting the transmitter wires.
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