Abstract: In a machine having rotating components, in which a substance is processed in continuous form, a sensor generates signals representative of the instantaneous supply rate of the substance at one or more selected locations in the machine. A processor performs a Fast Fourier Transform (FFT) analysis on such signals, to determine the amplitude harmonic value at each frequency over a spectrum of frequencies. The measured FFT values are compared to reference values at the corresponding frequencies in order to identify out-of-spec values and generate an error signal. Preferably also, the processor matches the frequency corresponding to the out-of-spec amplitude to a corresponding harmonic frequency value of one of the rotating machine components.

Abstract: A sortation system for separating products such as returned cigarette packs. A conveyor system moves the products in a predetermined orientation and minimum spacing past a bar code reader. A turnstile device contains a plurality of diverting bars which are selectively rotatable across the conveyor path in either direction to eject selected products either to the right or left as desired. A processor controls the turnstile device based upon bar code information to separate selected products and to allow the remaining products to remain on the conveyor.

Abstract: A disinfestation system for agricultural products, for example recovered tobacco, comprises a disinfestation unit which is releasably connected to plural containers. The disinfestation unit supplies a disinfestation gas (CO.sub.2) through the conduit means to the container, and periodically withdraws sample gas from said container. A thermal conductivity detector produces an electrical signal representation of the level of CO.sub.2 in the container, which is supplied, along with a temperature dependent signal, to a computer. The processor controls the introduction of additional CO.sub.2 throughout the process. Preferably, the system also includes heater elements, and the processor generates control signals for controlling temperature in the container. The computer controls the disinfestation process of multiple containers such multiple disinfestation processes can be carried out simultaneously.