The Ozone Converter is used to protect the air separation modules (ASMs) from the damaging effects of ozone by reducing the level of ozone in the bleed air stream. The ASM fiber is a plastic that is damaged by exposure to ozone. The normal ozone level in the bleed air stream is more than an order of magnitude higher than the minimum level acceptable to maintain the ASM life guarantees.
This ozone converter is only provided as part of a complete inerting system. It is not sold by Parker as a discrete item.
The ozone converter's core consists of a precious-metal formulation and a high surface area wash coat deposited on a substrate. This proven catalyst formulation and core configuration is presently used in aircraft inerting systems. The primary failure mode for the ozone converter is through very gradual deactivation of the catalyst, due to contamination. Deactivation is quantified by the failure of the catalyst to reduce O3 to O2.
Deactivation occurs when contaminants in the bleed air, most notably phosphorus, silica, and/or sulfur, find their way to the surface of the catalyst. These contaminants cover the surface of the catalyst and reduce its exposure to the ozone, thus preventing the O3 to O2 reaction from occurring. The required contamination levels for failure are low. Therefore, no visible evidence appears on the catalyst, nor is there a detectable increase in the pressure drop. The contamination's deactivation effect can be controlled to a large extent by the catalyst technology, thus, accounting for the proprietary nature of this technology.
The ozone converter is a line-replaceable unit with a defined maintenance cleaning interval. Cleaning removes contaminants from the surface of the catalyst that prevent the ozone from contacting the active catalyst sites. For a reaction to occur, ozone must contact the catalyst.
The core does not need to be removed from the converter to be cleaned as it is tested for ozone efficiency after cleaning. Its shelf life is indefinite and there are no limitations on storage temperature or humidity.
APPLICATIONS:
• Commercial Aircraft
• Regional Jets
• Military transports
• Military fighter jets
FEATURES AND ATTRIBUTES:
• Varying sizes to accommodate the bleed air flow
• The ozone converter can be covered with insulation to prevent its external temperature from exceeding 135°C with an inlet temperature of up to 260°C
• In-line mounting of the ozone converter can be supported via the inlet and outlet interfaces and by a welded bracket
• No special tools or test equipment are required for scheduled maintenance
• 6000 operational hours before cleaning
• The converter housing is welded stainless steel construction
• Mounting: standard couplings, V-band flanges, or bracket mounting
