The company received the unit for investigation.The company was able to duplicate the customer complaint.Initially, the concentration at 10lpm was 94%.After running for approximately 1.5 hours, the unit stalled and alarmed.The manifold pressure was higher than normal at 37 psi.The compressor current was at 9 amps.The company investigated the sieve beds and took the product caps off.The beds were properly filled, springs were present, and the feed cap baffles were properly installed.Beds appeared to be fine.Beds were reassembled and reinstalled back in the concentrator.The concentrator operated for 374 hours, did not shut down and operated within specification.As a result, the company could not determine what the root cause of the failure was.Based on the symptoms it is possible that debris got into the system causing an intermittent high pressure condition.
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