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721Ex
Users Manual
4
Ex-Hazardous Areas
An Ex-hazardous area as used in this manual refers to an
area made hazardous by the potential presence of
flammable or explosive vapors. These areas are also
referred to as hazardous locations.
The Product has been designed for use in Ex-Hazardous
Areas. These are areas where potentially flammable or
explosive vapors may occur. These areas are referred to
as hazardous (classified) locations in the United States,
as Hazardous Locations in Canada, as Potentially
Explosive Atmospheres in Europe and as Explosive Gas
Atmospheres by most of the rest of the world. The
Product is designed as intrinsically safe. This means that
connecting the Product to equipment that is used within
intrinsically-safe circuits will not cause an ignition-capable
arc as long as the entity parameters are suitably
matched.
 Warning
To prevent possible personal injury, check
entity parameters before making any
connections to this device.
Measuring Pressure
Warning
For safe operation and maintenance of the
Product, Refer to the table of ranges and
resolutions at the back of the manual for
information about overpressure and burst
pressure ratings. Pressure sensors can be
damaged and personnel injury can occur due
to improper application of pressure. Vacuum
should not be applied to any gauge pressure
sensor. The Product display shows “OL”
when an inappropriate pressure is applied. If
“OL” is seen on any pressure display, reduce
or vent pressure immediately to prevent
equipment damage or possible personnel
injury. “OL” is shown when pressure >120 %
of the nominal range of the sensor or when a
vacuum >2 PSI is applied on gauge range
sensors.
12


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