Abstract: A liquid level sensor used for determining liquid levels in a sealed container includes a heat source bonded to the container, a first temperature sensor mounted on the container adjacent the heat source, and a second temperature sensor mounted on the container spaced from the heat source. The temperatures at the first and second temperature sensors are sensed while the heat source is operating, and the differential in the temperatures is measured and used to control power to the heater. Changes in the differential in temperature between the first and second temperature sensors indicates when the heat conductivity between the first and second temperature sensors changes, due to presence or absence of a liquid in the container at the level of the temperature sensors.

Abstract: A liquid level sensor is used on a sealed container comprises a heat source bonded to the container, a first temperature sensor mounted on the container adjacent the heat source, and a second temperature sensor mounted on the container spaced from the heat source. The temperatures at the first and second temperature sensors are sensed while the heat source is operating, and the differential in the temperatures is measured and used to control power to the heater. Changes in the differential in temperature between the first and second temperature sensors indicates when the heat conductivity between the first and second temperature sensors changes, due to presence or absence of a liquid in the container at the level of the temperature sensors.

Abstract: An apparatus and method for use in a wireless communication system. The system having a driver accepting a data bit signal as input and converting the data bit signal into an output signal. The system also having an electromagnetic signal generator accepting the output signal from the driver and generating a signal suitable for wirelessly communicating the data represented by the data bit signal. The driver also causing a brief, high amplitude spike to travel to the signal generator as a component of the output signal to output a corresponding brief, high amplitude signal to also be wirelessly communicated.

Abstract: A clamp for securing a heater element to an injector barrel that includes a tube disposed about the heater element having a slit extending along the entire length of the tube which forms slit edges extending between ends of the tube. Clips extend about the tube and have central clip portions slidably engaging the tube by the slit edges. The clips are joined to a pair of clip pivots which define a pivotal axis substantially normal to the slit edges and extend through the tube at a location spaced away from the slit edges. The clips pivot with respect to the tube by using adjustment screws such that the central clip portion slides along the length of the tube to compress the tube around the heater element.