1. Municipal Water Tower Automated Supply Control
Automating the water supply of elevated municipal water towers. By installing the 61F-11 inside a standard 61F-G controller, three electrodes of varying lengths (common, low-level pump start, high-level pump stop) are suspended in the reservoir. When the water level falls below the medium electrode, the 61F-11 triggers the supply pump via its 5A contact rating until water reaches the short electrode, where it then switches off.
Problem SolvedEliminates traditional mechanical float switch issues such as physical jams, mineral encrustation, and structural corrosion, resulting in a maintenance-free, high-reliability autonomous supply loop.
Conductive level sensing8 VAC inter-electrode voltageAutomatic water supplyPF113A SocketSelf-holding circuit
2. Industrial Wastewater Sump Automatic Drainage
Controlling heavy-duty drainage pumps in industrial sumps to prevent liquid overflow. As wastewater rises and bridges the gap to the highest electrode, the 61F-11 energizes its internal relay to activate drainage pumps. Once the liquid level drops below the lower boundary electrode, the relay de-energizes, shutting down the pump to avoid dry-running.
Problem SolvedPrevents hazardous wastewater overflows and floor flooding. Conductivity-based detection operates reliably even in highly turbulent, dirty, or contaminated water where optical, ultrasonic, or mechanical float sensors are prone to fouling and failure.
Wastewater drainageConductive level controlRelay contact output11-pin plug-in relayElectrode holder
3. Agricultural Irrigation Sump Dry-Run Protection
Protecting submersible irrigation pumps from dry-running in deep wells or suction sumps. By deploying the 61F-11 in a 61F-G1 controller configuration, an additional low-level alarm electrode is monitored. If water falls below the safe minimum suction level, the relay de-energizes immediately (within an 80 ms response time), tripping the pump contactor and preventing operation without fluid.
Problem SolvedEliminates pump motor burnout and impeller damage caused by dry-run thermal and mechanical stress, securing high-cost agricultural pumping infrastructure against water source depletion.
Idling preventionDry-run protectionLow-level alarm80 ms response timeConductive level detection
