Abstract: A control device utilizing multidigit binary coded position signals generated in a selected sequential format by a position transmitter to indicate the position of an element movable between limits in increments of the travel path of the element. The position signals are supplied to a comparator device. A process signal reflective of a range of a process condition is supplied as a binary coded digital process signal to a reference device which generates digital binary coded command position signals in selected sequential format compatible with the binary coded position signals so each binary coded command signal indicates a desired position of the movable element. The binary coded command position signals are supplied to the comparator device.

Abstract: Control and positioning devices wherein a digital position signal is generated indicative of the position of a moveable element between limits and is supplied to a comparator device and where a digital signal is also provided to the comparator device indicative of a selected position of the element where the comparator device compares the two digital signals and operates actuator device to move the element in a corrective direction toward the selected position where movement terminates upon arrival of the element at the selected position.

Abstract: A control arrangement particularly useful in solar heat collecting systems utilizing a heat transfer medium which is heated during circulation through first and second solar collectors and emitted to a receiver. The first and second solar collectors, including absorber plates to be heated by the sun, are disposed in generally planor relation. The control arrangement compares a first signal responsive to the temperature of the first solar collector absorber plate with a second signal responsive to a selected reference temperature and provides an output signal to control means which operate valve means to control flow of the heat transfer fluid to the first and second solar collectors.

Abstract: A control system for operating process controller means to initiate corrective action to maintain a selected process condition in a selected range including first sensor means to sense the process condition and provide a first condition output signal, a second sensor means to sense a second condition which affects the process condition to provide a second condition output signal reflective of the second condition, amplifier means to selectively amplify the process condition output signal and provide a modified process condition output signal, summing means to selectively sum the process condition output signal and the second condition output signal and provide a reference signal, comparator means to compare the modified process condition output signal and the reference signal to provide a first comparator output signal when the modified process condition output signal exceeds the reference signal and to provide a second output signal when the reference signal exceeds the modified process condition output sign

Abstract: Flow control arrangement for use in a heating process utilizing multiple heat sources at different temperatures to transfer heat to a selected fluid circulated through the sources including at least one first heat source at a first temperature and having a fluid inlet means to receive the fluid and fluid outlet means adapted to emit the fluid, first valve means to control flow of fluid to the first heat source inlet, at least one second heat source at a second temperature having fluid inlet means to receive the fluid and fluid outlet means to emit the fluid, second valve means to control flow of fluid to the second heat source, a source of fluid adapted to supply the fluid to the first and second valve means, conduit means connecting the second heat source fluid outlet with the first valve, conduit means connecting the first heat source fluid outlet with the second valve means and controller means to actuate the first and second valve means and the source of fluid to direct fluid flow to one of the first and

Abstract: A security cap to be attached to a union nut of a piping union where the union nut is provided with at least one radially outwardly extending post where the security cap includes: a cylinder of friable material of selected wall thickness defining an internal chamber of selected diameter at least as great as the diameter of the union nut having an opening defined by an open end of the cylinder and adapted to receive the union nut where cover means are provided to cover the end of the cylinder opposite the opening; and elongate slot means cut in the cylinder sidewall means where the slot means extend from the open end of the cylinder and at an oblique angle relative to a line drawn parallel to the longitudinal axis of the cylinder where the slot is adapted to receive the union nut post to retain the union nut within the chamber defined by the cylinder; and means to retain the union nut within the chamber.