ISG Fluid Level Sensor

The Fluid Level Sensor detects and reports the presence or absence of fluid by immersion without moving parts.

Working Principle

Uses the non-linear properties of doped silicon to detect a liquid or excessive heat in conjunction with a current limiter and heat sink.
As the temperature of the sensor changes, so does the voltage across it - thermally variable resistor.
The change is modest within the operating window, but extreme once removed from fluid.
Uses "self heating property"
Select trigger V between in fluid and air.