Based on the thermal principle, there are two resistors in the closed probe, one of which is heated as the probe resistance and the other is not heated as the reference resistance. When the medium flows, the heat on the heating resistance is taken away. The resistance value is changed. The difference between the two resistances is used as the basis for determining the flow rate.

No moving parts, maintenance-free, easy installation, one model for a variety of pipe diameter requirements. Continuous adjustable switching quantity, very low pressure loss, compact structure. LED display flow trend and switch status.

Gas-liquid dual-use, can be used for pneumatic and hydraulic systems, can be used for circulating water, cutting fluid and lubricating oil cut-off monitoring, and pump idling protection.