312C, 315C, 318C, 319C, 320C, 321C, 322C, 325C, 330C and M325C Excavators and 325C MHPU and 330C MHPU Mobile Hydraulic Power Units Engine and Pump Control – V2 – Senders

Fuel Level Sender



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Fuel Level Sender

The fuel level sender is attached to a float in the fuel tank. As the fuel level changes, the float inside the tank moves. The movement of the float will change the resistance of the sender. The voltage to the controller will change as the resistance of the sender changes. The controller will monitor this voltage and the controller will compare this voltage to values that are known. This comparison will determine the level of fuel in the tank.

Temperature Sender



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Engine Coolant

The resistance of the sender will change as the temperature of the coolant changes. The voltage to the controller will change as the resistance of the sender changes. The controller will monitor this voltage and the controller will compare this voltage to values that are known. This comparison will determine the temperature of the coolant.

Hydraulic Oil

The resistance of the sender will change as the temperature of the fluid changes. The voltage to the controller will change as the resistance of the sender changes. The controller will monitor this voltage and the controller will compare this voltage to values that are known. This comparison will determine the temperature of the hydraulic oil.