Ametek 900

5-56 | Model 900 ADA / Model 930 Sulfur Pit Analyzers
Examining and Caring For the Flamepaths
The analyzer is designed with flamepaths that will prevent flame propa-
gation from within the analyzer and its Ex d Disconnect Enclosure to the
outside, should an internal explosion occur.
The flamepaths on the analyzer consist of:
• The Ex d Disconnect Enclosure joining surfaces (enclosure door and hous-
ing) and its cable entry ports, seal entries, and pressure switch entries.
During each analyzer maintenance, use a feeler gauge to check the
flamepath gap of the Disconnect Enclosure flange (enclosure door and
housing joining surfaces). The gap must not exceed 0.15 mm; if the gap
exceeds this value, contact AMETEK for advice. See Warning below.
• All separable joints in the Heater Plate Assembly and Seal Body. These
parts include the joining surfaces of the Heater Plate, the joining
surfaces of the Seal Body and its cover, the RTD mounting locations
(whether RTDs are installed or their holes are plugged), and both the
threaded and cylindrical end of the Thermal Insulation Tube between
the Heater Plate and Seal Body.
During each analyzer maintenance, use a feeler gauge to check
the flamepath gap of the Heater Plate Assembly flange (upper/
lower Heater Plate joining surfaces, inside the Analyzer Oven). The
gap must not exceed 0.1 mm; if the gap exceeds this value, contact
AMETEK for advice. See Warning below.
Take extreme care to avoid damaging the threads on the cable entry
glands on the Disconnect Enclosure and all threaded parts on or in
the Heater Plate/Seal Assemblies. Clean, defect-free threads are essen-
tial to ensure a flameproof connection.
When performing equipment maintenance in hazardous areas, all
safety standards and procedures must be followed, as specified by the
Owner Company, local electrical-inspection authority, and National/
EU regulations.
Purged Analyzer (Hazardous Location) Applications
Do not apply power to the analyzer if there is damage (scratches,
indentations, or wear) to any flamepath (on the Oven Heater or
Disconnect Enclosure). Applying power to an analyzer with a dam-
aged flamepath is dangerous and could result in serious injury or
death, or serious damage to equipment. Review this section for com-
plete information about caring for the flamepaths.
Replace parts immediately if damage or wear is apparent. Contact
AMETEK if there is any doubt about the integrity of any flamepath.
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CAUTION
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WARNING
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WARNING