OREC™ Catalytic Destruct Unit: Description
0500 Series Ozone Test Chamber with CDU
0500 with Catalytic Destruct Unit
The OREC™ Ozone Catalytic Destruct Units (CDUs) are designed for the OREC™ 0500 – 0900 series Ozone Chambers. The ozone that is discharged from the test chamber is “catalyzed” ... turning it back into oxygen, eliminating the need for complicated and costly external ducting. The CDUs are completely self-contained units which can be serviced separately from the chamber.
Utilizing a proprietary metal oxide catalyst, the CDU is able to achieve over 99% destruct efficiency for concentrations of up to 250 PPHM. Comparatively, alternative technologies that employ activated carbon, which chemically reacts with the ozone, generates carbon dioxide and small amounts of carbon monoxide.
Another disadvantage of this process is that it consumes the activated carbon. Unlike activated carbon, which requires frequent replacement, the OREC™ CDU Catalyst is not rapidly diminished by ozone, a replenishment cycle of 18 to 24 months is recommended. The catalyst replacement cycle is dependent on the frequency of use and the concentration of ozone that is typically used for testing. It is necessary to return the CDU to the factory for the replacement of the catalyst, where it receives a full operational inspection, testing and certification.
The Catalytic Destruct Unit is constructed of high–grade stainless steel. It rests on 4 replaceable ozone and heat resistant elastomeric supports which ensure stability and reduces the effects of vibration. Cut-Away View of the Catalytic Destruct Unit
Cut-Away View of the CDU
The CDU is coated with an industrial hybrid powder coat finish which is color matched to the OREC™ Chambers. A stainless steel mesh screen covers the exhaust port preventing entry of foreign material. The CDU is internally sealed for maximum efficiency.
The illustration shows a cut–away view of the Catalytic Destruct Unit. The primary structural pieces are shown in red, while green represents the heater and heater support brackets.
The metal oxide catalyst is contained within the blue structure and yellow identifies the blower. The ozone laden air enters through the opening in the bottom just below the heater.
OREC™ Catalytic Destruct Unit: Operation
OREC™ Model 0900 with a Catalytic Destruct Unit Ozone laden air enters the process through an opening on the bottom of the unit. The blower intakes fresh air at a rate approximately 5 times of the chamber exhaust volume, generating a low pressure area above the chamber exhaust port. The fresh air / ozonated exhaust mixture is then passed through a heating chamber to reduce ambient moisture, dramatically increasing catalyst efficiency.
The heated fresh air / ozonated air mixture is routed downward through a filtration system, preventing airborne particulates from entering the process, then drawn through the catalytic chamber. It is at this point that the ozone is catalyzed.
The de–ozonated air then enters the blower compartment and is exhausted into the atmosphere. Flow rate, flow direction, chamber configuration, and catalytic chamber volume have all been carefully designed and tested to provide maximum residence time, thus high efficiency. The "S" shaped flow pattern reduces the overall size of the CDU, making it the most compact available at the efficiency level.
Ozone Control Standards
Current EPA 1-Hour Standard: 0.12 PPM
Proposed EPA 8-Hour Standard: 0.08 PPM
OSHA 8-Hour Standard: 0.10 PPM
Health Affects of Ozone
Perceivable Through Smell 0.03 PPM
Probability of Headaches 0.10 PPM
Lung Function Impairment 0.16 — 0.20 PPM
Reduced Physical Strength 0.24 — 0.70 PPM
Inflammatory Reaction of Tissue 0.80 PPM
Chromosome Damage Begins After 6 – 10 Hours 1.00 PPM
Please refer to the Adobe® PDF Document OREC™ Ozone Material Safety Data Sheet (MSDS)
OREC™ Catalytic Destruct Unit: Specifications
Full Operation Range: 0-250 PPHM
Efficiency: ≥ 99%
Air Flow: 750 CFM
Heater Energy: 250 Watt
Catalyst Life: 18 — 24 Months
Catalyst Volume: 0.5 Ft³
Catalyst Mass: 12.5 kg (27.6 lb)
Total Unit Weight: 27.2 kg (60 lb)
Dimensions (WxDxH): 610 x 350 x 290 mm (24 x 13¾ x 11¼ in.)
Power Requirements: 115 VAC, 60 Hz, 1 P
Warranty: 1 Year Parts/Workmanship
NIST Direct Traceability & ISO/IEC 17025 Accredited Calibration Laboratory
National Institute of Standards & Technology
Reports of Analysis
Direct (Primary) Traceability
NIST Report of Analysis 839.03-03-155
NIST Report of Analysis 839.03-05-168
NIST Report of Analysis 839.03-08-004
NIST Report of Analysis 839.03-09-142
NIST Report of Analysis 639.03-11-163
American Association for Laboratory Accreditation
American Association for Laboratory Accreditation
Instrument Calibration Certificate 1424.01
Mechanical Testing Certificate 1424.02

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Index Terms: OREC, OREC, 0500, 0900, ozone test chambers, ozone, ozone destruction, ozone generation, ozonator, ozone generator, ozone test chamber, ozone monitor, Osmonics, ASTM D518, ASTM D1149, ASTM D1171, ASTM D3395, ASTM D4575, ASTM D470, ISO 1431, ozone research, rubber cracking, ozone resistance, rubber, crack growth, weathering, rubber deterioration, surface cracking, ozone cracking, ozone measurement, rubber test, ultraviolet, UV.

© 2013 OREC, a Division of CCSi, Inc.
All Rights Reserved • Published: March, 2013
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