MSA ZGARD S - Page 3

General Warnings
U WARNING
1. The ZGARD S & DS gas sensors
described in this manual must be
installed, operated, and maintained
in strict accordance with the labels,
cautions, warnings, instructions,
and within the limitations stated.
2. The ZGARD S & DS gas sensors
must not be installed in outdoor
areas or in locations where
explosive concentrations of
combustible gases or vapors might
occur in the atmosphere: Class 1,
Group A, B, C, and D areas as
defined by the NEC. Because the
gas sensors are not explosion-
proof, they must be located in non-
hazardous areas.
3. Do not paint the ZGARD S & DS
gas sensors.
4. The only absolute method to assure
the proper overall operation of a
gas detection instrument is to check
it with a known concentration of the
gas for which it has been calibrated.
Consequently, a calibration check
must be included as part of the
installation and as a routine
inspection of the system.
5. Use only genuine MSA replacement
parts when performing any
maintenance procedures provided
in this manual. Failure to do so may
seriously impair instrument
performance. Repair or alteration of
the ZGARD S & DS gas sensors,
beyond the scope of these
maintenance instructions or by
anyone other than authorized MSA
service personnel, could cause the
product to fail to perform as
designed, and persons who rely on
this product for their safety could
sustain serious personal injury or
death.
6. The ZGARD S & DS gas sensors
must be installed, located and
operated in accordance to all
applicable codes. These codes
include, but are not limited to, the
National Fire Prevention Code and
National Electric Code.
7. Do not exceed the relay contact
ratings listed in this manual.
Otherwise, the relay operation may
fail, which can result in personal
injury or death.
Failure to comply with the above warnings
can result in serious personal injury or
death.