HOMER LEWIS GREER
Engineers in Bryn Athyn, PA

4307617, Dec 29, 1981

May 12, 1980

6/150414

Homer L. Greer - Bryn Athyn PA
John R. Malloy - Drexel Hill PA
Clark M. Rosenblum - Glenside PA

Honeywell Inc. - Minneapolis MN

G01L 900, H01L 4306

73753

An indicating and control apparatus uses Hall effect elements arranged on one side of a non-magnetic wall separating the elements from selectively positionable respective magnets. The magnets are selectively positioned adjacent to the non-magnetic wall to energize respective ones of the Hall effect elements by a code disc which is selectively positionable and displaceable with respect to the wall. The code disc is attached to a manually rotatable knob projecting from a housing enclosing the selectively positionable magnets and having a dial face on the exterior surface of the housing to cooperate with an indicator on the knob. The Hall effect elements, in turn, are located on a printed circuit board and are connected to associated circuitry to bias the Hall effect elements and to utilize output signals from the Hall effect elements. In a specific embodiment the printed circuit board is associated with a pressure sensor which is arranged to supply electrical signals representative of respective fluid pressures to signal storage elements on the printed circuit board in combination with the output signals from the Hall effect elements for utilization as data and control signals, respectively, by a data processing system connected to the indicating and control apparatus.

3980939, Sep 14, 1976

May 13, 1974

5/469345

Homer L. Greer - Bryn Athyn PA

Honeywell Inc. - Minneapolis MN

G05B 1128

318599

A process control system including a control station responds to the departure of a process variable from a set point to provide a direct current signal in a two-wire transmission line in a direction dependent upon the direction of such departure and time-proportioned in accordance with the magnitude of the departure. A solid state power relay that accepts the d-c signal at a single pair of input terminals includes high-current rating triacs that are adapted selectively to be fired by triggering pulses generated in response to the d-c signals to supply alternating current power from a source of single-phase or three-phase alternating current to a heavy-duty motorized valve for operation of the latter in one direction or the other and at a speed in accordance with the signals. The power relay is characterized in its provisions for synchronizing the triggering pulses to the triacs with the time of zero voltage across the triac, precluding such firing of a triac when the voltage across an associated triac is less than a predetermined value, delaying for a predetermined time such firing upon a command for reversal in the direction of operation of said motorized valve, locking-out to prevent further firing of the triacs upon rapid reversal of input commands, and monitoring of the triacs to provide an alarm and/or to effect deenergization of the power relay and motorized valve when the triacs fail to fire in accordance with the command.

3990310, Nov 9, 1976

Jul 28, 1975

5/599726

Homer L. Greer - Bryn Athyn PA
William F. Newbold - Philadelphia PA

Honeywell Inc. - Minneapolis MN

G01L 902

73398AR

A closed system couples the inlet and outlet pressures generated by a centrifugal pump to a pair of flexible diaphragms which seal the flow tube in a pressure rebalance system for measuring fluid flow. The system is filled with a conducting fluid which forms certain resistance paths whose resistance varies with diaphragm position. This resistance change is used to generate signals which control the pump motor to the end that the diaphragms maintain a predetermined position and the pump head is equal to the differential pressure.

3939708, Feb 24, 1976

Sep 12, 1974

5/505758

Homer L. Greer - Bryn Athyn PA
William F. Newbold - Philadelphia PA

Honeywell, Inc. - Minneapolis MN

G01F 138, G01L 708

73205R

A closed system couples the inlet and outlet pressures generated by a centrifugal pump to a pair of flexible diaphragms which seal the flow tube in a pressure rebalance system for measuring fluid flow. The system is filled with a conducting fluid which forms certain resistance paths whose resistance varies with diaphragm position. This resistance change is used to generate signals which control the pump motor to the end that the diaphragms maintain a predetermined position and the pump head is equal to the differential pressure.