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Water Level Sensor and Datalogger Testing and Demonstration www.itrc.org/reports/pdf/WaterLevelSensor.pdf ITRC Report No. R 99-002 Figure 5. TeleSAFE RTU panel. Control Room Monitoring Computer Power Distribution Box Volumetric Tank RTU Enclosure Weir Plate UPS System Pump Contactors RS-232 to 485 Converter RS-485 Communication 120 VAC 120 VAC 4” PVC Water Supply Line Pumps Figure 6. Sensor Testing Setup at the ITRC Water Delivery Facility.