ISG Fluid Level Sensor

By Type of Fluid (Viscosity, thermal carrying capacity)

The ability of a fluid to wick away heat is what makes these sensors work. The more viscous the fluid, the less able it is to keep the die cool so that its resistance doesn’t drop. Thus, a given sensor will not be able to withstand as high a voltage in oil as it does in coolant. This is compounded if the fluid is also hot, as it won’t take as much extra heating to overwhelm the sensor’s ability to withstand a higher voltage, so the hotter the fluid, the lower the withstanding voltage.

K12 die


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