MLS Series Liquid Level Switches with 2-inch NPT and 1-1/2-inch NPT mounting, are float activated to operate an electrical SPDT reed switch for alarm or shutdown of an engine or electric motor.. The wrong wiring can lead to faulty operation of the level switch, which may lead to unpredictable results and dangerous situations. Therefore, technicians should pay attention to the wiring diagrams and make sure that all the components are correctly connected and installed.
Make the electrical wiring connections according to appropriate wiring diagrams for the alarm or shut-down system used. The electrical connection is 1⁄2-inch-14 NPT. Insulate all electrical connections and install the cover before reconnecting electrical power. Verify all pressure connections are tight before pressurizing the system.. Level Switch Wiring Diagram This circuit is connected as per the diagram shown above. In the above circuit, adjust the resistor 'R1' by placing the probes within the water tank to turn ON the K1 relay. After that, take out two probes from the water tank & observe the K1 relay turned OFF.