1
Coy L Hays, Thomas A Brunson, Gary A Lenz: Method and apparatus for diagnosing a pump system. Innovation Management Group, Head Johnson & Kachigian, July 10, 2001: US06260004 (165 worldwide citation)

An apparatus and method for diagnosing rotating equipment commonly used in the factory and process control industry are provided. The apparatus and method are intended for use in assisting a maintenance engineer in the diagnosis of turbines, compressors, fans, blowers and pumps. The preferred embodi ...


2
Coy L Hays, Gary A Lenz: Method and apparatus for diagnosing a pump system. Innovation Management Group, Head Johnson & Kachigian, December 11, 2001: US06330525 (116 worldwide citation)

An apparatus and method for diagnosing rotating equipment commonly used in the factory and process control industry are provided. The apparatus and method are intended for use in assisting a maintenance engineer in the diagnosis of turbines, compressors, fans, blowers and pumps. The preferred embodi ...


3
Hehong Zou, Kale P Hedstrom, Jogesh Warrior, Coy L Hays: Field based process control system with auto-tuning. Rosemount, Westman Champlin & Kelly P A, November 25, 1997: US05691896 (28 worldwide citation)

A process control system controls a process through a control output signal based on a set point and a measured process variable. The process control system includes a control circuit having a set point input, a process variable input and a control output. The control circuit generates the control o ...


4
Hehong Zou, Coy L Hays: Process controller having non-integrating control function and adaptive bias. Rosemount, Westman Champlin & Kelly P A, September 22, 1998: US05812428 (9 worldwide citation)

A process controller controls an integrating-type process based on a measured process variable and a set point. The process controller includes an error generating circuit, a non-integrating control circuit and an adaptive bias circuit. The error generating circuit generates an error signal based on ...