It was built in a phenolic plate, with wires mounting in a series configuration thus probe´s electrical resistance corresponding to the sum of each filament resistance (10 pieces) it increases the electrical power dissipated for the set. Shows a skecth for design and built device (probe dimensions and electrical circuit control), Wheatstone bridge electrical resistors are indicated as R1 (potentiometer for bridge balance), R2 and R3, while RW is probe´s electrical resistance. Thus better indicated for CTA design e) Tungsten wire achieves constant temperatures for lower speeds, thus better (Constantan, 1.5 and 1.7 m.s-1) approach to HWA-CCA behavior with constant ΔT c) Tungsten filament presentsīetter behavior than Constantan, in low speeds (< 1.0 m.s-1) d) Constantan achieves higher temperature variation, Test range conditions, approaching an HWA-CVA behavior b) The temperature achieved in higher airspeed Main conclusions are: a) Electrical voltage is practically constant in the HWA, and data acquisition through Arduino. In-house fabrication intends to have a low-cost device in comparison to commercial HWA prototypes are built with Constantan and Tungsten filament materials, providing measurements when operating Thermal anemometry is an appealing option, once its able to measure low speeds conditions and itsįluctuations, for velocities (as in turbulent flow) or temperature (as in magnetic field interference). Fluid velocity measurement systems with low-cost are desired in industry and scientific researchĪpplications.