This instrument offers three control functions for user selection.
1. When the water level to be controlled is below Sensor 1 (indicator light on), and the water level of the supply system is above Sensor 2 (indicator light off), the control power is activated. When the water level to be controlled rises above Sensor 1 or the supply system water level drops below Sensor 2, the control power is disconnected.
As shown in MODE A-1
Gear "A" has another function: without connecting Sensor 2, when the water level to be controlled is above Sensor 1, the control power is disconnected. When the water level to be controlled is below Sensor 1, the control power is activated.
As shown in MODE A-2
2. Place both Sensor 1 and Sensor 2 into the water to be controlled. When the water level is above Sensor 1, the control power is disconnected; when the water level is below Sensor 1, the control power is activated. This function provides insurance, preventing any sensor damage from affecting water level control.
As shown in MODE B
3. Insert Sensor 1 and Sensor 2 into the water to be controlled. When the water level is below both sensors simultaneously, the control power is activated and remains on until the water level rises above both sensors, at which point the control power is disconnected and stays off until the water level drops below both sensors again. This function maintains the water level between the two sensors.