Capsule Weighing System Based on Microwave Resonance Method
WORK Microwave’s capsule weight sensor is designed for inline monitoring of tablets and filled capsules. The microwave resonance technology based system offers high accuracy, speed and can be easily integrated due to a small installation size. Several sensor heads can be mounted and run in parallel to increase the throughput.
In typically
the pharma industry, capsules are produced in batches, which
are then evaluated as a whole and either rejected or declared to be good. The decision is based on a sample of a relatively
small number. A random
sample out of the batch is weighed and a mathematical model is fed with the data. The outcome is usually yes or no. This approach is susceptible to statistical uncertainty and leads to an unnecessary high number of wrong rejects of good products – as well as the approval of bad products. Furthermore, the batch production is a method with a high amount of manual labour and is a discontinuous approach.
To overcome these drawbacks, WORK Microwave have designed a high speed inline sensor system that enables 100 % inspection of each capsule’s
weight.
This approach allows for a continuous production and the number of rejects is tremendously reduced, as the individual products, that
are beyond
tolerable weight limits, are identified. Besides the optimization of raw material usage, the number of man-hours that was intended for weighing purposes can be reallocated to different tasks. If demanded, a traceability of each individual product can be established.
WORK Microwave’s brand new capsule weighing system is based on the microwave resonance sensor
method. head The consists of a cavity certain
resonator with an operating frequency of roughly 2.5 GHz. It is mounted around an electrically non-conductive transporting tube (e.g. out of Teflon, PEEK or glass) in which the capsules are guided. The capsules are dynamically characterized while they move through the resonator. Only one capsule is allowed to be inside the resonator at the same time. If a capsule enters the resonator, it interacts with the electro-magnetic standing wave. This leads to a detuning of resonance frequency. The effect is proportional to the capsule’s weight.
WORK Microwave GmbH With more than 30 years’ expertise in RF electronics, WORK Microwave is a leading provider of high-precision inline sensor solutions for a wide range of measurements and applications used by the food, pharmaceutical, chemical, textile, paper processing, tobacco and many more industries.
www.work-microwave.com/sensors-and-measurement/ Sales: +49 8024 6408 222
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