Liquid Flow Measurement Well-Suited for Limited-Space Flow Control Solutions

Editor: Wolfgang Ernhofer

The new Out-of-Liquid element from IST provides users with the flexibility of easily adapting the element to their application and at a lower cost.

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Out of Liquid flow sensor with heater and sensor on stainless steel tube.
Out of Liquid flow sensor with heater and sensor on stainless steel tube.
(Picture: IST)

Thermal mass flow sensors and measuring systems are well-known devices that are offered in a wide range of products by a handful of suppliers in the marketplace. Most of the designs are compact, ready to use systems with an inlet and an outlet, and a channel including a passive or an active output. These systems are sufficient for many general-purpose applications where component price and size are less significant, but most of them are not well-suited for price-sensitive and limited-space flow control solutions.

In such cases, IST thermal mass flow sensor elements offer considerable solutions and the option to customize various parameters to meet users requirements at a beneficial pricing.

Measuring flow directly in a liquid channel has proven a difficult task without dramatically shortening the lifetime and damaging the sensor especially because of debris and other contaminating elements in aggressive liquids. The principle used is thermal mass flow measuring principle. A heater and a sensor chip, both with backside metallization, are soldered on the tube’s outer surface providing a thermal contact with the liquid without being in direct contact with the medium, meaning the Out-of-Liquid element is even suitable for aggressive fluids.