The Doppler Solid Flow Switch and Microwave Solid Flow Meters are based on state-of-the-art technology, providing Non Contact Measurement for Solid Flow/ No Flow and  Continuous Solid Mass Flow Measurement.  Doppler Non Contact Solid Flow Switch The Doppler flow switch emits a low power microwave signal toward the material being monitored. Part of this signal is reflected off the material back to the antenna of the Doppler Flow Switch. This reflected signal combines with the emitted signal to produce a beat frequency, which is the difference in frequency between the two signals. If the material being monitored is not moving, the reflected signal will be the same frequency as the emitted signal, and there will be no beat frequency produced. However, if the material is moving, the reflected signal will be shifted in frequency, and a difference, or beat frequency, will be produced. This shift in frequency is called the Doppler effect. The presence or absence of this beat frequency is sensed by the Doppler Flow Switch to detect a flow or no flow condition.

• Suitable for most industries, including feed, grain, milling, food, cement, mining, power, and plastics
• In hazardous locations where there is the threat of combustible dust