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A control system for a home ambulatory liquid oxygen system having an oxygen concentrator, condenser, cryocooler, a heater and a storage dewar, includes an oxygen concentration sensor which senses the concentration of oxygen gas generated by the oxygen concentrator and generates a first signal in re

A control system for a home ambulatory liquid oxygen system having an oxygen concentrator, condenser, cryocooler, a heater and a storage dewar, includes an oxygen concentration sensor which senses the concentration of oxygen gas generated by the oxygen concentrator and generates a first signal in response thereto; a liquid level sensor which senses the liquid level in the dewar and generates a second signal in response thereto; a temperature sensor which senses the temperature in the dewar and generates a third signal in response thereto; and a microprocessor for receiving the first, second and third signals for computing the flow concentration of gaseous oxygen out of the concentrator and into the condenser, the level of liquid oxygen in the dewar, the temperature in the dewar and for controlling the transfer of liquid oxygen from the storage dewar.

대표청구항 ▼

A control system for a home ambulatory liquid oxygen system having an oxygen concentrator, condenser, cryocooler, a heater and a storage dewar, includes an oxygen concentration sensor which senses the concentration of oxygen gas generated by the oxygen concentrator and generates a first signal in re

A control system for a home ambulatory liquid oxygen system having an oxygen concentrator, condenser, cryocooler, a heater and a storage dewar, includes an oxygen concentration sensor which senses the concentration of oxygen gas generated by the oxygen concentrator and generates a first signal in response thereto; a liquid level sensor which senses the liquid level in the dewar and generates a second signal in response thereto; a temperature sensor which senses the temperature in the dewar and generates a third signal in response thereto; and a microprocessor for receiving the first, second and third signals for computing the flow concentration of gaseous oxygen out of the concentrator and into the condenser, the level of liquid oxygen in the dewar, the temperature in the dewar and for controlling the transfer of liquid oxygen from the storage dewar. ed to the drive impact shaft by means of a taper fit. 19. An attachment for a percussive tool according to claim 18, wherein locking means are provided for holding the taper fit in engagement. 20. An attachment for a percussive tool according to claim 19, wherein the locking means for holding the taper fit in engagement includes the locating rod which screws into the end of the drive impact shaft. 21. A method for forming a hole in a wall comprising: providing an attachment for a percussive tool, said attachment having a plurality of rows of teeth arranged substantially parallel to and spaced apart from each other to form a shape substantially having rotational symmetry about a central axis; connecting the attachment to a percussive tool; placing the attachment in contact with the wall and causing percussive action of the attachment such that the rows of teeth form a plurality of parallel grooves and ridges in the wall; and rotating the attachment through an angle about the central axis and placing the attachment in contact with the wall in a position overlaying the plurality of parallel grooves and ridges and causing percussive action of the attachment to break up the ridges and form a hole of a substantially uniform depth. 22. A method for forming a hole in a wall according to claim 21, said method further comprising: first drilling a circular hole in the wall; providing a locating rod on the central axis of the attachment protruding beyond the extent of the teeth; locating the rod in the circular hole whilst forming the first set of parallel grooves; and locating the rod in the circular hole to locate the attachment as it is rotated. 23. A method for forming a hole in a wall according to claim 22, wherein the method is repeated partly overlapping the first hole to form a larger hole. 24. A method for forming a hole in a wall according to claim 21, wherein the method is repeated partly overlapping the first hole to form a larger hole. mply for the privacy enclosure. U.S. Pat. No. 6,302,053, however, shows a privacy region which is stored on the rear side of a rotatable seat. However, in this application, the deck space beneath the seat is readily available for the privacy enclosure. It is desirable to have a privacy enclosure assembly, where decking space is not readily available, to even further maximize deck space.