What are the two main types of contents gauges?

• A. Variable resistance type and Capacitance type
• B. Pressure gauge and Float gauge
• C. Digital gauge and Analog gauge
• D. Mechanical gauge and Electrical gauge

Answer: (A)

Fuel contents are read using two main electrical principles. In the variable resistance type, a float rides with the fuel surface and is linked to a resistance network; as the level changes, the resistance output varies, and the transmitter converts that change into a quantity reading on the gauge. In the capacitance type, a probe acts as part of a capacitor; the fuel height changes the effective dielectric and thus the capacitance, which the transmitter converts into a signal for the gauge to display the quantity. Capacitance gauges have no moving parts and can offer good linearity, while variable resistance gauges are simple and robust but involve moving parts that can wear and be affected by slosh. This is why the two main categories are variable resistance and capacitance.