FCS Probe Monitors

TURCK probe style flow monitors detect the speed of liquids and gases without using mechanical parts. These solid state flow monitors operate on the calorimetric principle: the measure of heat transfer from an object to a fluid. The TURCK solid state flow monitors use two temperature dependent resistors. One of the resistors (R1) monitors the temperature of the surrounding fluid. The other resistor (R2) is connected to a heating element. The heating element heats R2 to a temperature that is slightly above the surrounding fluid temperature. When there is no fluid flow, the difference in resistance between R1 and R2 is a fixed value. As fluid moves over the flow monitor probe, heat is conducted away from the heating element causing the temperature on R2 to decrease. This heat loss changes the difference in resistance between R1 and R2. The resistance difference is measured by a Wheatstone bridge circuit. A change in resistance difference causes a change in the bridge voltage. The flow set point is determined by comparing the bridge voltage to a reference voltage.

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