Fluid_Trac Water Level Sensor for Wastewater Holding Tanks

This application note covers the Fluid-Trac® 2-wire water level sensor used as a replacement for a standard 33-240 Ohm resistive float water level sender, reed-switch tube sensors, or capacitive tube senders in gray water and black water holding tanks. Waste water holding tank monitoring systems on RVs, motor homes and boats consists of two components - a water level sender and a gauge. The water level sender measures the level of the water in the holding tank and sends the information to the gauge to display the water level. A traditional float water level sender is a 33-240 Ohm resistive float level sender. It consists of a float attached to an actuating arm (rod) with a variable resistor (potentiometer) mounted at the end of this rod. The resistive float water level sender interfaces with the gauge via a wiper that slides across the resistive material of the potentiometer.