| 摘要 |
A level sensor (80) for detection of fluid levels or interfaces between fluids including flowable particulate solids comprises a hollow probe body (81) having located therein a plurality of spaced sensors (85) responsive to changes in heat capacity or dielectric constant of a surrounding fluid medium due to changes in fluid level. In an alternative form an oscillator (98) is moved within the hollow probe to detect a fluid level by a change in dielectric constant of a surrounding medium to activate or deactivate the oscillator. |
