Nordson Corporation

Fire Sentry Systems, Inc.

Robert C Lindrud

David A Castleman

Don R Scarbrough

A system and method for coincidence detection of ungrounded or inadequately grounded parts during the electrostatic coating process in order to improve production flow, provide an overall cost saving by efficient use of the coating material and prevention of accidental fires and false shutdown during production. The present invention utilizes a coincidence detection technique which performs a test for radio-frequency electromagnetic energy radiated by sparking and/or corona discharge caused by ungrounded parts outside a electrostatic coating area and a test for sensing and discriminating spurious radio-frequency electromagnetic energy radiated by sparking and/or corona discharge caused by any other external source. In accordance with one specific embodiment, the test performed outside the booth may include a further test for detecting ultraviolet energy radiated by the sparking and/or corona discharge. Upon detecting an ungrounded part, the part may be removed from the production line and appropriate steps to properly ground it may be taken. Performing coincident tests thus prevents false shutdowns in the production line.

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Santa Fe, NM, United States of America

Robert C Lindrud