Honeywell STT700 SmartLine User Manual page 54

A.6 Conditions of Use" for Ex Equipment", Hazardous
Location Equipment or "Schedule of Limitations":
The installer shall provide transient over-voltage protection external to the equipment such
that the voltage at the supply terminal of the equipment does not exceed 140% of the
voltage rating of the equipment.
Intrinsically Safe: Must be installed per drawing 50133855
Division 2: This equipment is suitable for use in a Class I, Division 2, Groups A, B, C, D; T4 or
Non-Hazardous Locations Only.
Transmitter only selection:
For ATEX Category 3 or Zone 2 Locations, the Transmitter must be installed within an
enclosure with a minimum degree of protection of IP54 in accordance with:
For US Installations: in a tool-secured enclosure which meets the requirements of
ANSI/ISA 60079-0 and ANSI/ISA 60079-15 and the ultimate application.
For ATEX or IECEx: in a tool-secured enclosure which meets the requirements of
EN/ IEC 60079-0 and EN/ IEC 60079-7 and the ultimate application.
Transmitter in Enclosure Selections:
Consult the manufacturer for dimensional information on the flameproof joints for repair.
Painted surface of the STT700 may store electrostatic charge and become a source of
ignition in applications with a low relative humidity less than approximately30% relative
humidity where the painted surface is relatively free of surface contamination such as dirt,
dust or oil. Cleaning of the painted surface should only be done with a damp cloth.
The enclosure is manufactured from low copper aluminum alloy. In rare cases, ignition
sources due to impact and friction sparks could occur. This shall be considered during
Installation, particularly if equipment is installed a Zone 0 location.
If a charge-generating mechanism is present, the exposed metallic part on the enclosure is
capable of storing a level of electrostatic that could become Incendive for IIC gases.
Therefore, the user/ installer shall implement precautions to prevent the buildup of
electrostatic charge, e.g. earthing the metallic part. This is particularly important if
equipment is installed a Zone 0 location.
For Installation of the NPT Plug or Adapter follow instructions as outlined in 34-XY-33-03.
Page 46
STT700 Temperature Transmitter User's Manual
Revision 1