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A20 Catalyst Monitoring System
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An overnight test to check the status of the catalyst. 'Green' signifies the catalyst is working correctly; 'amber' signifies the catalyst performance is reduced; and 'red' signifies that the catalyst should be changed to maintain good anaerobic conditions. This is the 230V model. The Catalyst Monitoring System is patented by DWS ( (Nos. EP2577281 / 602011043352 / US9157900).
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