Abstract: A shielding apparatus for an electronic component includes a first insulative encapsulant surrounding at least a portion of the component and a second encapsulant surrounding said first encapsulant and having conductive particles dispersed therein for absorbing ionizing radiation.

Abstract: A material or liquid level sensing system is disclosed having a first triggerable pulse generator connected to a level sensor which is in turn connected to a second triggerable pulse generator wherein the first triggerable pulse generator supplies a pulse to the level sensor which transmits the pulse to trigger the second pulse generator for supplying an output both to an output device and to the first triggerable pulse generator to trigger another pulse to the level sensor and so on. In this manner, the first pulse generator supplied a subsequent pulse to the level sensor depending on whether or not the second triggerable pulse generator has received the previous pulse from the first triggerable pulse generator. Thus, the system continuously supplies pulses to the level sensor as long as the second triggerable pulse generator continues to receive pulses, but these pulses are blocked when the material or liquid being sensed is at a predetermined level and the output means is appropriately activated.

Abstract: A level sensing apparatus is disclosed having a source for supplying a signal having a predetermined frequency, a level sensor connected to the source and having an output for supplying an output signal having the predetermined frequency as long as the material, the level of which is being sensed, is not at a predetermined level, a frequency sensitive circuit for receiving the output signal from the level sensor and for providing an output whenever the frequency of the signal is above or below the predetermined frequency, and a load which is connected to be responsive to the output from the frequency sensitive circuit.