New Product: 4120.30 Analog Insertion Flow Meter

In 1968 Weber introduced the very first thermal flow switch for liquids called the 4120. Because it was specifically built for the harsh environments of the steel industry where instruments are judged on their longevity, an additional innovation ensured the instrument would maintain its accuracy almost indefinitely. As illustrated below, a typical thermal flow sensor uses two perfectly matched elements to measure flow. One element is heated above the temperature of the medium while the other is not. By measuring the heat loss of the heated element compared to the non-heated element, flow can be measured very accurately.

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