In a Solid State Oil Quantity Tank Unit, what is used as the sensing element?

In a Solid State Oil Quantity Tank Unit, what is used as the sensing element?

• A. A Float
• B. Nickel Alloy Wire
• C. A Capacitive Plate
• D. A Magnetic Strip

Answer: (B)

In a solid-state oil quantity tank unit, the sensing element is a nickel alloy wire that acts as a resistance-based temperature sensor and heater. A small current passes through the wire, heating it, while oil around the wire acts as a heat sink. The amount of oil changes how effectively the wire is cooled: with more oil, the wire stays cooler (lower resistance, since nickel alloys have a positive temperature coefficient), and with less oil, it heats up more (higher resistance). The circuit measures this resistance and converts it into an oil quantity reading. Nickel alloy wire is chosen because it provides a predictable, stable resistance change with temperature and can withstand the operating conditions without moving parts.

In a solid-state oil quantity tank unit, the sensing element is a nickel alloy wire that acts as a resistance-based temperature sensor and heater. A small current passes through the wire, heating it, while oil around the wire acts as a heat sink. The amount of oil changes how effectively the wire is cooled: with more oil, the wire stays cooler (lower resistance, since nickel alloys have a positive temperature coefficient), and with less oil, it heats up more (higher resistance). The circuit measures this resistance and converts it into an oil quantity reading. Nickel alloy wire is chosen because it provides a predictable, stable resistance change with temperature and can withstand the operating conditions without moving parts.