Practical Control - Level Detection

Question 1

What are two simple examples of level detection in tanks?

Answer 1

Sight Glass or a dipstick

Question 2

Electrically operated float gauges use what component to determine the difference in angular moment caused by the floating?

Answer 2

A potentiometer

Question 3

Aeroplanes use what kind of level detection?

Answer 3

Capacitance probes

Question 4

How do Capacitance probes use the change in relative permittivity?

Answer 4

As the fuel reduces the difference between the two cylinders in the probes change giving a difference electrical output.

Question 5

What emits a sound wave towards a liquid and measures the time difference between the wave reflecting off the surface and the bottom of the tank?

Answer 5

Ultrasonic level indicator

Question 6

How can you use load cells to determine level?

Answer 6

4 in a wheatstone bridge arrangement using the potential difference in output would show which section was off level