High purity chemical container with external level sensor and liquid sump
First Claim
1. A container for high purity chemicals comprising a shell with an external surface comprising a top surface, a side surface and a bottom surface, at least one orifice capable of being used as an inlet, at least one orifice capable of being used as an outlet, an ultrasonic level sensor affixed to the external bottom surface of said shell for determining the amount of high purity chemical in said container and a diptube connected to one of said orifices through which high purity chemical can be dispensed from said container or pressurized gas can be delivered to the container to dispensed chemical, a sump in said bottom surface into which a lower end of said diptube terminates, said sump sized to accommodate said lower end of said dip tube and a detection zone for said ultrasonic level sensor to determine the amount of high purity chemical in said sump, wherein said ultrasonic level sensor is positioned adjacent said sump to at least determine the amount of chemical in said sump.
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Accused Products
Abstract
A container for high purity chemicals having an externally placed level sensor to avoid contamination of such chemical and for ready serviceability and a removeable liquid out diptube to facilitate cleaning during refilling or refurbishing, both of which are situated adjacent a sump in the bottom of the container. The container can have a valved inlet and outlet and can be constructed of stainless steel which is electropolished.
80 Citations
18 Claims
- 1. A container for high purity chemicals comprising a shell with an external surface comprising a top surface, a side surface and a bottom surface, at least one orifice capable of being used as an inlet, at least one orifice capable of being used as an outlet, an ultrasonic level sensor affixed to the external bottom surface of said shell for determining the amount of high purity chemical in said container and a diptube connected to one of said orifices through which high purity chemical can be dispensed from said container or pressurized gas can be delivered to the container to dispensed chemical, a sump in said bottom surface into which a lower end of said diptube terminates, said sump sized to accommodate said lower end of said dip tube and a detection zone for said ultrasonic level sensor to determine the amount of high purity chemical in said sump, wherein said ultrasonic level sensor is positioned adjacent said sump to at least determine the amount of chemical in said sump.
- 9. A container for high purity chemicals having a metallic shell, a valved inlet, a valved outlet, an ultrasonic level sensor removeably affixed to an external bottom surface of said shell for determining the amount of high purity chemical in said container and a diptube removably connected to said outlet through which high purity chemical can be dispensed from said container by connection to a downstream high purity chemical delivery system, a sump in said bottom surface into which a lower end of said diptube terminates, said sump sized to accommodate said lower end of said dip tube and a detection zone for said ultrasonic level sensor to determine the amount of high purity chemical in said sump, said ultrasonic level sensor positioned below a portion of said sump unoccupied by said diptube.
- 12. A container for high purity chemicals comprising a metallic shell with an external surface comprising a top surface, a side surface and a bottom surface, a valved inlet, a valved outlet, an ultrasonic level sensor removeably affixed to the external bottom surface of said shell radially inside a skirt of said container and located above the plane defined by the bottom circumferential lower edge of said skirt, for determining the amount of high purity chemical in said container and a diptube removably connected to said outlet through which high purity chemical can be dispensed from said container by connection to a downstream high purity chemical delivery system, a sump in said bottom surface into which a lower end of said diptube terminates, said sump sized to accommodate said lower end of said dip tube and a detection zone for said ultrasonic level sensor to determine the amount of high purity chemical in said sump, said ultrasonic level sensor positioned below a portion of said sump unoccupied by said diptube.
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17. A method for determining the level of high purity chemical in a container of high purity chemical having a metallic shell with an external surface comprising a top surface, a side surface and a bottom surface, a valved inlet, a valved outlet, an ultrasonic level sensor affixed to the external bottom surface of said shell for determining the amount of high purity chemical in said container and a diptube connected to said outlet through which high purity chemical can be dispensed from said container, a sump in said bottom surface into which a lower end of said diptube terminates, comprising;
- positioning said ultrasonic level sensor below said sump, generating ultrasonic waves in said high purity chemical in said container, sensing the reflection of said generated ultrasonic waves by said sensor, and generating a signal proportional to said reflection.
- View Dependent Claims (18)
Specification