Abstract: A control system (method and apparatus) is adaptive on-line with changing process conditions, for example, the specific heat of a liquid used in a process. The system regulates a variable of a process (temperature of the liquid used in the process) and has a fast dynamic response to handle temperature transients while adapting to changing process conditions. The system uses feedforward and feedback control loops, which in the case of the process involving the temperature control of a liquid are respectively responsive to the temperature of the liquid before and after a control point. The system exercises adaptive control of the feedforward control function from the feedback loop. The system is preferably implemented with a digital computer. The fast dynamic response is enhanced by applying microwave energy from a microwave generator to heat the liquid at the control point with the feedforward and feedback control loops controlling the microwave generator.

Abstract: For use with weighting apparatus of the electromagnetic-load-compensation type, where a stirring or other magnet creating an external magnetic field is disposed near such apparatus, a protective shield is interposed between that magnet and the apparatus, in flux-transmitting relation to the magnet, so as to shield the apparatus from the externally created field. The shield is formed from ferromagnetic material of sufficiently high permeability to provide a path of least reluctance for transmitting flux from the external field, thereby preventing such flux from interfering with intended operation of the apparatus.

Abstract: For use with weighing apparatus of the electromagnetic-load-compensation type, where a stirring or other magnet creating an external magnetic field is disposed near such apparatus, a protective shield is interposed between that magnet and the apparatus, in flux-transmitting relation to the magnet, so as to shield the apparatus from the externally created field. The shield is formed from ferromagnetic material of sufficiently high permeability of provide a path of least reluctance for transmitting flux from the external field, thereby preventing such flux from interfering with intended operation of the apparatus.