Thomas Products Ltd., of Southington, Conn., has launched its new Model 2600 flow switch. This unit operates by a unique two-mode design—set point and by-pass. The set point is achieved either by increasing or decreasing liquid flow at the calibrated set point. A magnet-equipped shuttle being displaced at the calibrated set point actuates the hermetically sealed reed switch housed within the removable bonnet assembly. The by-pass mode operates to allow for high flow, but maintains the very low pressure drop.