Honeywell stt850 SMARTLINE User Manual page 83

A.5 Conditions of Use" for Ex Equipment", Hazardous
Location Equipment or "Schedule of Limitations":
Consult the manufacturer for dimensional information on the flameproof joints for repair.
Painted surface of the STT850 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.
Intrinsically Safe: Must be installed per drawing 50091227
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.
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.
The enclosure is manufactured from low copper aluminium 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.
Revision 3
STT850 Temperature Transmitter User's Manual
Page 73