Enclosure; Areas With Different Classifications - Mettler Toledo IND780 Guide D'installation

Chapter 3
Special Requirements
When an IND780 terminal is installed inside an area classified as Division 2 or
Zone 2/22, some special requirements must be considered. This chapter discusses
these items. The METTLER TOLEDO control drawing 64069877 and the ATEX
approval certificate must also be reviewed for any special requirements.

Enclosure

Only IND780 terminals that are factory-labeled as Category 3 or approved for
Division 2 may be installed into a Division 2 or Zone 2/22 hazardous area. Also
note that a Nationally Recognized Test Laboratory approved dust tight enclosure is
also required for proper installation of the panel-mount terminal in the U.S. and
Canada. This note is on the METTLER TOLEDO control drawing 64069877.

Areas with Different Classifications

The IND780 terminal has been approved for use in an area classified as Division 2
or as Zone 2 or Zone 22. This approval DOES NOT mean that the IND780 terminal
can be used in Division 1 or Zone 0/1 areas. Different precautions must be taken
when installing equipment into these areas. METTLER TOLEDO offers other
terminals for use in Division 1 or Zone 0/1 areas.
If any portion of the installation involves an area classified as Division 1 or Zone
0/1, then the complete system should be configured to be compatible with a
Division 1 or Zone 0/1 classification. For instance, if the IND780 terminal will be
installed in a Division 2 area but the load cells will be located within a Division 1
area, a load cell barrier is required. These barriers are available through METTLER
TOLEDO.
Some IND780 options are not approved for all areas. Please consult the METTLER
TOLEDO control drawing 64069877 for specific details. Applications involving a
mixture of Division ratings or a mixture of Zone ratings should be discussed with
METTLER TOLEDO. Please consult your local METTLER TOLEDO representative
regarding these types of applications.
WARNING
EARLIER MODELS OF THE IND780 TERMINAL THAT ARE NOT
LABELED AS DIVISION 2 or Zone 2 APPROVED OR MARKED AS
EUROPEAN CATEGORY 3 MUST NOT BE INSTALLED IN A DIVISION 2
OR ZONE 2/22 ENVIRONMENT.
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