1
Seberger Stephen G, Grumstrup Bruce F, Gassman George W: Communication system and method.. Fisher Controls Int, April 13, 1994: EP0591926-A2 (11 worldwide citation)

The present invention relates to a circuit which is connected to a two-conductor control system for a variable analog DC input and that also enables bidirectional digital communication along the two conductors for diagnostic operations of a transducer. The novel circuit includes a switch circuit tha ...


2
Seberger Stephen G, Grumstrup Bruce F, Gassmann George W: Electro-pneumatic converter calibration.. Fisher Controls Int, April 13, 1994: EP0591925-A2 (5 worldwide citation)

A temperature compensation method for a microprocessor based electro-pneumatic converter device (10) including an initial calibration sequence, a compensation sequence, and an operation sequence. Linearization of an electro-pneumatic positioner including the steps of adjusting the positioner feedbac ...


3
Grumstrup Bruce F, Seberger Stephen G: Emergency shutdown test system. Fisher Controls Int, December 12, 2001: EP1161636-A1 (1 worldwide citation)

An emergency shutdown system for a process control system includes an emergency shutdown (ESD) valve (12) and an associated valve actuator (18). An emergency shutdown (ESD) controller (46) provides output signals to the ESD valve in the event of a failure in the process control system. A solenoid va ...


4
Grumstrup Bruce F, Johnson Bruce A, Snowbarger Jimmie L: Acquisition of characteristic data of control device during its operation. Fisher Controls Int, August 19, 1998: EP0858625-A1 (1 worldwide citation)

Data samples (A-L) are obtained from a control device (10, 11, 12, 16, 17) while in use to control a material process (13). Selected ones of these samples are stored which represent results of operating the device over portions of its characteristics, and they are selectively combined to provide an ...


5
Seberger Stephen G, Grumstrup Bruce F, Gassmann George W: Electro-pneumatic converter calibration. Fisher Controls Int, August 19, 1998: EP0859302-A2

A temperature compensation method for a microprocessor based electro-pneumatic converter device (10) including an initial calibration sequence, a compensation sequence, and an operation sequence. Linearization of an electro-pneumatic positioner including the steps of adjusting the positioner feedbac ...


6
Seberger Stephen G, Grumstrup Bruce F, Gassman George W: Etalonnage dun convertisseur electro-pneumatique, Electro-pneumatic converter calibration. Fisher Controls International, Fisher Controls International, RIDOUT & MAYBEE, January 8, 2002: CA2107624

A temperature compensation method for a microprocessor based electro-pneumatic converter device including an initial calibration sequence, a compensation sequence, and an operation sequence. Linearization of an electro-pneumatic positioner including the steps of adjusting the positioner feedback lin ...


7
Grumstrup Bruce F, Johnson Bruce A, Snowbarger Jimmie L: Acquisition de donnees caracteristiques dun dispositif de regulation en cours de fonctionnement, Acquisition of characteristic data of control device during its operation. Fisher Controls International, Fisher Controls International, RIDOUT & MAYBEE, May 9, 1997: CA2236257

Data samples (A-L) are obtained from a control device (10, 11, 12, 16, 17) while in use to control a material process (13). Selected ones of these samples are stored which represent results of operating the device over portions of its characteristics, and they are selectively combined to provide an ...


8
Grumstrup Bruce F, Junk Kenneth W, Snowbarger Jimmie L, Taylor Eugene R Jr: Procede et dispositif permettant de faire des mesures deterministes pour un parametre dun dispositif de commande de processus alors que le processus est en cours, Method of and apparatus for deterministically obtaining measurements of a process control device parameter while a process is operating on-line. Fisher Controls International, Fisher Controls International, RIDOUT & MAYBEE, April 8, 1999: CA2304518

A diagnostic test unit for deterministically measuring one or more parameters, such as dead band, dead time, response time, gain, or overshoot, of a process control device that is connected in a process control loop during operation of a process includes a switch controller, a signal generator, a sw ...


9
Snowbarger Jimmie L, Taylor Eugene R Jr, Grumstrup Bruce F, Junk Kenneth W: Procede et appareil permettant dobtenir en ligne et de maniere non invasive des mesures dun parametre de dispositif de commande de processus, Method of and apparatus for nonobtrusively obtaining on-line measurements of a process control device parameter. Fisher Controls International, Fisher Controls International, RIDOUT & MAYBEE, April 8, 1999: CA2304616

An apparatus for nonobtrusively determining one or more parameters, such as dead band, dead time, or response time of a process control device that is connected on-line in a process control loop includes a measurement unit and a processing unit (30). The measurement unit is coupled to the process co ...


10
Grumstrup Bruce F, Seberger Stephen G: Systeme de controle darret durgence, Emergency shutdown test system. Fisher Controls International, Fisher Controls International, RIDOUT & MAYBEE, September 8, 2000: CA2372138

An emergency shutdown system for a process control system includes an emergency shutdown (ESD) valve (12) and an associatedvalve actuator (18). An emergency shutdown (ESD) controller (46) provides output signals to the ESD valve in the event of a failure inthe process control system. A solenoid valv ...