The FSW-6000\/7000 Series are thermal flow switch monitors designed to monitor flow status and also used to detect level of liquids, air and gas. A chain of 8 LED’s gives the user a visual indication of the flow rate. In addition, there isalso a dichromatic LED, which shows the switch point status of the unit. The sensing element and connection of the FSW-6000\/7000 Series are made with 316 SS. The standard enclosure is glass-filled nylon and is also available in an aluminum enclosure for hazardous environments. The FSW-6000\/7000 Series can be made with a great variety of process connections such as threaded, flange, or sanitary.The FSW-6000\/7000 Series line of thermal flow switch monitors is based on the principle of thermal dispersion. A typical configuration uses two platinum Resistance Temperature Detectors (RTD’s) set within the tip of the sensor. One RTD is heated a few degrees above the temperature of the medium and the other RTD is used as a reference, sensing the actual process temperature. The second RTD also monitors the temperature of the medium, as any changes in temperature must be compensated for in the first RTD. As the process medium flows over the tip of the sensor it disperses some of theheat from the first RTD. The temperature change between the two RTD's signals the probe’s electronics and the switch changes state once the set point has reached.