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Control of drying time in a container - where 2 probes determine contents level and allow calculation of an operational dwell time which is compared with a preset dwell period
Control of drying time in a container - where 2 probes determine contents level and allow calculation of an operational dwell time which is compared with a preset dwell period
A control system for filling and emptying a drying chamber is described. In the upper area of the container are two probes a small distance apart. A time measurement commences when the contents drop below the upper probe and ends when the level falls below the lower probe. An operational dwell time is calculated by a control unit which assesses the measured time, probe separation, container volume and cross-section. The calculated dwell time is compared with a pre-set minimum dwell time. If the minimum dwell time is not reached the container outlet closes and if the dwell time is exceeded the contents can be released. USE/ADVANTAGE - For drying granulated materials, particularly plastics. Residence time in the container is carefully controlled to prevent insufficient drying or overheating.
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