The weber Sensors 4120.5xM Flow Captor is a calorimetric flow switch designed for reliable, maintenance-free monitoring of water-based liquid flow in industrial processes. Its fully encapsulated stainless steel construction and IP67 rating make it suitable for harsh environments where mechanical flow switches would fail due to corrosion or wear.

How does the LED chain display improve commissioning and diagnostics?

Unlike conventional flow switches that only indicate a binary on/off state, the Flow Captor features an integrated LED chain that displays real-time flow rate relative to the adjustable setpoint. During commissioning, the technician can see the actual flow signal and set the switching threshold precisely without external measuring equipment. In operation, the green-to-red colour change provides immediate visual confirmation of flow status without opening the control cabinet.

What maintenance advantages does calorimetric technology offer?

With no mechanical moving parts, the 4120.5xM eliminates the sticking, fouling, and mechanical wear common to paddle and vane-type flow switches. The sensor probe is heated slightly above the media temperature; as flow increases, the cooling effect changes the electrical resistance of the sensing element. This solid-state design ensures consistent switching accuracy over millions of cycles without recalibration or component replacement.