Hazardous Area Classification; Protection Approaches - Mettler Toledo PANTHER Guide D'installation

METTLER TOLEDO PANTHER Panel-Mount Terminal Division 2 Installation Guide
Hazardous Area
Classification

Protection Approaches

1-2 (7/03)
A hazardous (explosive) area is classified as a Division 2 area when the hazard is either
not present during normal operating conditions or is present only for very short periods of
time. This typically happens in an area adjacent to a Division 1 area. The area must be
classified by an agent of the customer. METTLER TOLEDO DOES NOT CLASSIFY
HAZARDOUS AREAS.
The PANTHER panel-mount terminal has been Factory Mutual approved for use in areas
classified as:
Class I, II, III, Division 2, Groups A, B, C, D, F, G
when installed in a nationally recognized, test laboratory-approved, dust-tight enclosure
appropriate for the environment and installed per METTLER TOLEDO control drawing
155907R.
THE PANTHER PANEL-MOUNT TERMINAL HAS A TEMPERATURE RATING OF
°
T4a (120 C). IT MUST NOT BE USED IN AREAS WHERE THE AUTO IGNITION
TEMPERATURE OF THE HAZARDOUS MATERIAL IS BELOW THIS RATING.
Various protection methods are used by manufacturers of equipment located within a
Division 2 classified area. METTLER TOLEDO uses non-incendive circuits. All inputs and
outputs to the PANTHER panel-mount terminal have been classified as incendive (capable of
arcing or sparking – such as switches or relays) or non-incendive (incapable of arcing or
sparking). Depending upon how a specific input or output is defined, it must be protected
accordingly. For installation in the United States, refer to the current version of the National
Electrical Code (NFPA 70, Articles 500 – 504) and ANSI/ISA-RP12.6 for specific
requirements. For locations outside the US, refer to the electrical regulations for the country
of installation for the specific wiring requirements.
As a general guide, if a signal is rated as non-incendive and is connected to another non-
incendive device and the non-incendive field circuit parameters agree in the correct manner,
no special protection of the signal is required. The 155907R control drawing and this
manual both contain a list of field circuit parameters for each non-incendive output from the
PANTHER panel-mount terminal, including voltage, current, capacitance and inductance
values. Comparing these values from the PANTHER panel-mount terminal with those of
other approved apparatuses (such as load cells) enable the PANTHER panel-mount terminal
to be used with METTLER TOLEDO's or other manufacturers' load cells in an approved
system. (Refer to Chapter 2.)
Temp = T4a
WARNING