Patent Application
20200057040
This invention relates to preparing a certified referential material, which is to be used for identifying certain gaseous compounds within a room or area. Commercial companies (such as Linde and Air Gas) and National Institute of Standards and Technology (NIST) provide premade standardized compounds, also known as “reference materials”, that are used for comparison with an air sample, which is collected by a laboratory. Once the air sample is compared to the reference material, the tested-for volatile compounds are then quantitated accordingly. However, the current system for providing standardized testing in laboratories becomes problematic when a lab requires a different concentration than those provided by Air Gas or Linde or NIST. Additionally, the current system requires shipment of high pressure cylinders which requires special shipping methods. In the current system, when the pressurized cylinders have reached their expiration date, they either need to be shipped back to the supplier for recertification or disposed of, both of which creates complications for laboratories. In other words, as technology advances and labs require different concentrations of reference materials, the invention described and claimed herein allows such labs to create a desired reference material onsite and avoid the complications of sending and receiving certified pressurized cylinders.
The gas phase standard preparation device described herein allows laboratories to request a custom certified reference material for the requested air quality analytes. This is accomplished by providing a premade sealed ampule that contains the requested chemical cocktail at the requested concentrations. The ampule is then placed into a flexible steel coated sleeve and the sleeve is sealed. The sleeve is then placed into a gas phase standard preparation station, which is comprised of three to four separate compartments. In a first embodiment the preparation station provides four compartments. In a second embodiment the preparation station provides three compartments. The first compartment provides two connections for a vacuum pump and for nitrogen gas and a several tubes that bring the nitrogen gas to a proportional valve and then a pressure sensor. Another tube or tube is extended from the pressure sensor into a separate compartment and connected to the ampule sleeve which is placed in its own compartment. The ampule sleeve is then connected to a gas cylinder which is placed in its own compartment.
The preparation station is further comprised of a first lid and a second lid. The first lid provides a mandrel that breaks the ampule in the sleeve when the first lid is closed. The second lid encloses the cylinder in its respective compartment. When the ampule breaks from closure of the first lid, the nitrogen pushes the reference material into the cylinder and fills the cylinder with the reference material and the nitrogen.
This invention is for a device and method of use for a gas phase standard preparation device for providing a certified reference material, which is to be used for identifying a specific gaseous compound or multiple gaseous compounds within a sample of air taken from a room or area. This invention allows for the certified referential material to be created in a laboratory instead of ordering premade, high pressure cylinders that are to be utilized in the lab or at an off-site location. This invention additionally allows for the certified referential material to be tailored or customized for the lab that it is to be used in. This is beneficial when the companies that produce these reference materials or the National Institute of Standards and Technology (NIST) are incapable of providing a premade standardized reference material. This is also beneficial for the laboratory and the environment in the reduction of waste cylinders because the high-pressure cylinders could be reused. This invention would also result in drastically lower shipping costs due to the fact that a sealed ampule would be shipped as compared to a premade, high pressure cylinder.
This invention is comprised of a sealed ampule tube 5 which is comprised of an ampule 10, an ampule sleeve 15, and compression fitting plugs 25. The ampule 10 is placed within the ampule sleeve 15 and the ampule sleeve 15 should be made of air tight, inert or passivated materials. This is usually accomplished by providing a stainless steel sleeve internally coated with a passivation material such as a silica ceramic. The ampule sleeve 15 provides a first end and a second end with each end having a compression fitting 25, which can be seen in
The ampule sleeve 15, which contains the ampule 10, is then placed within a preparation station. The preparation station is described herein as two separate embodiments: a first embodiment 50 and a second embodiment 100. The first embodiment and second embodiment are described respectively below.
This first embodiment 50 is a preparation station that is comprised of a housing, a sealed ampule tube 5, a first lid 51 with a clasp 53, a second lid 52, and hinge 54 that the first lid 51 and second lid 52 are attached to, a heated mandrel 70, a lid mandrel 75, an electronics control board 80. This embodiment is further comprised of a load sensor 110, an IR sensor 115, and a formed adapter 120. Although, the first embodiment 50 of the preparation station is shown and described as having four separate compartments, it is anticipated that the location, number, and orientation of the compartments may be altered without departing from the novel aspects of the invention being claimed and described herein.
The first compartment provides a first connection and a second connection in the exterior side of the housing for linking a vacuum pump 55 and diluent gas cylinder 60 respectively. The vacuum pump 55 is then connected to a vacuum pump valve 56 and the diluent gas cylinder 60 is attached to a diluent gas valve 61. A set of tubes extend from the vacuum pump valve 56 and the diluent gas valve 61 and converge into a tube 64 as seen in
The flexible gas supply line 66 that is used to supply the nitrogen gas to the ampule sleeve 5 and also remove any room air from within ampule sleeve 5 prior to supplying the nitrogen gas. The flexible gas supply line 66 has a first end and a second end. The first end of the flexible gas supply line 66 is linked to the tube 64 and the second end of the flexible gas supply line 66 is linked to the first end of the ampule sleeve 15 which contains the ampule 10.
The ampule sleeve 15 extends into a third compartment within the preparation station 50. The third compartment provides insulated walls 85 and the heated mandrel 70. The heated mandrel 70 provides heat at the location, or substantially at the location, of the ampule 10 within the ampule sleeve 15. The heated mandrel 70 is electrically linked and controlled by the electronics control board 80 in the first compartment. The second and third compartments within the preparation station are adjacent to one another and are provided above the first compartment. The first lid 51 is provided above the second and third compartments, which is shown in
The second end of the ampule sleeve 15 is linked to a reference material cylinder 40 with a formed adapter 120. The reference material cylinder 40 is provided in the fourth compartment and receives the certified reference material. A heat sink 90 is provided in the fourth compartments, which is accessible through the second lid 52. The heat sink 90 provides a level of security in the event that the integrity of the reference material cylinder 40 is compromised and also assists with absorbing heat as gas is compressed into the reference material cylinder 40. The insulation 85 is provided for conserving energy due to heat loss. When an individual desires to remove a reference material cylinder 40 or place a reference material cylinder 40 in the fourth compartment, the second lid 52 should be lifted.
A lid mandrel 75 is provided on the first lid 51. The lid mandrel 75 and heated mandrel 70 provide arcuate surfaces, which are shown in
The electronics control board 80 is electronically linked to various electrical components within the gas standard preparation device. provides thermocouple control, pressure sensor control, valve control, and heater control. In the present invention the electronics control board 80 controls the thermocouple provided in the compartment housing the reference material cylinder 40, the pressure sensor 65, the vacuum pump valve 56, the diluent gas valve 61, and a heater control which is connected to the heated mandrel 70. In addition, it is anticipated that the lid mandrel 75 may provide heating elements and be electronically linked to the electronics control board 80.
The infrared (“IR”) sensor 115 is provided to detect the temperature of the reference material cylinder 40 as it is being filled with gas. It is anticipated that the IR sensor 115 is electronically linked to the electronics control board 80 and assists with ensuring that the reference material cylinder is not overheating due to compression.
The load sensor 110 is placed under the formed adapter 120. The formed adapter 120 is provided to link the ampule tube 5 to the reference material cylinder 40. The formed adaptor 120 provides a fulcrum point of contact for the reference material cylinder 40 to the load sensor 110 to measure the mass of gas added to the cylinder 40. The formed adapter is held down by the second lid 52, thereby causing the cylinder 40 to pull down as a cantilevered weight at the fulcrum point. Accordingly, an accurate weight can be observed as the cylinder 40 is filled.
The use of the formed adapter 120 and load sensor 110 in combination with the IR sensor 115 is significant because it avoids providing a weight sensor directly on each reference material cylinder 40 placed into the gas standard preparation device.
Prior to creating a certified reference material with the preparation station 50, the second lid 52 is lifted, the reference material cylinder 40 is placed in the fourth compartment, the first lid 51 is lifted, and the sealed ampule tube 5 is installed in the preparation station. The sealed ampule tube 5 is installed by connecting the first end of sealed ampule tube 5 to the second of the flexible gas supply line 66 and joining the second end of sealed ampule tube 5 to the reference material cylinder 40. A vacuum pump 55 is joined to the vacuum pump valve 56 and a diluent gas cylinder 60 filled with diluent gas is joined to the diluent gas valve 61. The vacuum pump 55 is used to remove any room air from the tubes and sealed ampule tube 5 within in the preparation station and perform a leak check. Once the room air is removed, the reference material cylinder 40 is opened and a trickle flow of nitrogen gas from the diluent gas cylinder 60 is released into the preparation station. Accordingly, the first lid 51 is closed, thereby breaking the ampule 10 and releasing the material within the ampule 10 into the ampule sleeve 15. A preparation program is then started.
The preparation program is comprised of: (1) Heating the mandrel 70 up to 240 degrees Celsius; (2) Flowing the nitrogen gas through the ampule sleeve 15 containing the broken ampule 10; (3) Monitor temperature on the reference material cylinder 40; (4) pressurize the cylinder to the final pressure; (4) Close the cylinder valve; and (5) Verify the concentration.
This second embodiment 100 shares many components of the first embodiment 50, however this second embodiment additionally utilizes a plurality of bearings 105. At least one bearing is placed on the lid mandrel 75 and at least one bearing of the plurality of bearings 105 is placed proximate to the heated mandrel 70, which is shown in
While the embodiments of the invention have been disclosed, certain modifications may be made by those skilled in the art to modify the invention without departing from the spirit of the invention.
