US20060239665A1 - Gas chromatograph having a radiant oven for analytical devices - Google Patents
Gas chromatograph having a radiant oven for analytical devices Download PDFInfo
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- US20060239665A1 US20060239665A1 US11/111,111 US11111105A US2006239665A1 US 20060239665 A1 US20060239665 A1 US 20060239665A1 US 11111105 A US11111105 A US 11111105A US 2006239665 A1 US2006239665 A1 US 2006239665A1
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Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/0033—Heating devices using lamps
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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Definitions
- a chromatograph comprises an inlet where the sample is introduced, an oven containing an analytical column where the separation takes place, and a detector where the constituents of the sample are detected and recorded.
- Each of these parts of the instrument is temperature-controlled to ensure the integrity and repeatability of the analysis.
- An analysis performed at a constant controlled temperature is referred to as isothermal.
- the analytical column is typically placed in a temperature-controlled chamber, often referred to as an oven that is preheated to the desired temperature.
- a non-isothermal analysis where the column temperature is gradually raised over time, is also common, especially for samples with relatively massive components that would otherwise take a long time to elute from the column.
- an electromagnetic radiant source such as a microwave or infrared source.
- EM electromagnetic
- capillary columns which represent the overwhelming majority of analytical columns used in gas chromatographic analyses today, are typically fabricated from fused silica glass, which is transparent to radiant energy.
- the analytical column must be coated, or otherwise treated, with a material or substance that can absorb the radiation emitted from the radiant source and convert the radiant energy to heat.
- determining the precise temperature of an analytical column heated by a radiant source is difficult because it is difficult to ensure that a temperature probe absorbs and converts the radiant energy to heat in the same way as the column to provide an accurate measure of the column temperature.
- the directional or “line-of-sight” nature of an EM radiant source adds a potential source of temperature gradients across the column that would not be present in a conventional convection oven.
- a radiant oven comprises a radiant energy source configured to provide radiant electromagnetic energy, an insert configured to receive the radiant electromagnetic energy and convert the radiant electromagnetic energy into heat, and an additional element configured to receive the heat.
- FIG. 1 is a schematic diagram illustrating a simplified chromatograph in which a radiant oven constructed in accordance with an embodiment of the invention may reside.
- FIG. 2 is a schematic diagram illustrating a perspective view of an embodiment of the radiant oven of FIG. 1 .
- FIG. 3 is a schematic diagram illustrating a cross-sectional view of the radiant oven of FIG. 2 .
- FIGS. 4A and 4B are schematic views collectively illustrating plan and side views of an embodiment of the insert of FIGS. 2 and 3 .
- FIG. 5 is a schematic view illustrating an alternative embodiment of the insert of FIG. 3 .
- FIG. 6 is a flowchart illustrating the operation of a method for efficiently heating an analytical column.
- the radiant oven to be described below can be used in any analysis application where it is desirable to quickly and efficiently heat and cool an analytical column or other device.
- FIG. 1 is a block diagram illustrating a simplified gas chromatograph 100 , which is one possible device in which the radiant oven of the invention may be implemented.
- the radiant oven of the invention may also be used in any gas phase sampling device or in any analytical device, and may also be useful for liquid chromatography applications.
- the radiant oven can be used in a stand-alone application.
- the radiant oven can be used to quickly and efficiently heat a capillary column, a packed column, or other analytical apparatus.
- the gas chromatograph 100 includes an inlet 112 , which receives a sample of material to be analyzed via connection 102 and provides the sample via connection 114 to, for example, a chromatographic column 116 , also referred to as a capillary column, an analytical column, or just a column.
- a chromatographic column 116 also referred to as a capillary column
- an analytical column or just a column.
- the analytical column 116 may be heated to temperatures well above ambient temperature.
- the temperature to which the analytical column 116 is heated is dependent on the type of sample being analyzed and may vary during a sample run to analyze multiple compounds and elements from a single sample.
- the analytical column 116 is located in a temperature chamber, also referred to as an oven.
- the oven is a radiant oven 200 constructed in accordance with embodiments of the invention.
- the output of the column 116 is connected via connection 118 to a detector 126 in the gas chromatograph 100 .
- the output of the detector 126 , via connection 128 is a signal representing the result 132 of the analysis.
- FIG. 2 is a schematic diagram illustrating a perspective view of an embodiment of the radiant oven 200 of FIG. 1 .
- the radiant oven 200 includes a housing 202 having a recess 204 .
- the recess 204 is configured to releasably receive an insert 300 .
- the insert 300 is also sometimes referred to as a basket.
- An analytical column 116 which in this example is a chromatographic column, is wrapped around the insert 300 so that the analytical column 116 can be efficiently and uniformly heated and cooled in the oven 200 .
- the analytical column 116 can be either tightly or loosely wrapped around the outer surface of the insert 300 , depending on application. In one embodiment, the analytical column 116 is tightly wrapped around the insert 300 to minimize the amount of exposed column surface area so that heat absorption is maximized.
- the input and output of the analytical column 116 is omitted for drawing clarity.
- a temperature sensor 208 can be secured to the outer surface of the insert 300 to precisely determine the temperature of the insert 300 and the analytical column 116
- the oven 200 also includes a radiant source 206 and control circuitry 212 configured to control the duty cycle of the power supplied to the radiant source.
- the control circuitry 212 uses information fed back from the temperature sensor 208 to determine the power required to achieve and maintain the temperature in the radiant oven 200 at a set point prescribed by the analysis.
- the duty cycle is the fraction of ON time of the radiant source relative to the total cycle (ON+OFF) time.
- a duty cycle of 20% can be achieved with an ON time of 2 minutes vs. a total time of 10 minutes or an ON time of 2 seconds vs. a total time of 10 seconds, etc.
- the duty cycle is the same, the total cycle times are quite different.
- the total cycle time (10 minutes, 10 seconds, 10 milliseconds, etc.) plays an important role for radiant sources having fast reaction times such as a quartz halogen infrared (IR) radiant source.
- IR infrared
- the filament can cool significantly between cycles. Repeated heating and cooling of the filament in a quartz halogen IR radiant source causes fatigue and shortens the life of the filament.
- quartz halogen radiant source manufacturers suggest using “phase-angle fired” control where the total cycle time can be as small as a fraction of one cycle of the AC input power.
- the radiant oven 200 optionally includes a fan 214 , or other means for quickly cooling the oven 200 .
- the radiant source 206 can be mounted on a pedestal 216 .
- the radiant source 206 is a quartz halogen IR bulb having a cylindrical profile.
- the shape of the radiant source 206 may differ.
- the radiant source can be an infrared (IR) source as mentioned above, a microwave source, an ultraviolet (UV) source, a visible (VIS) source, an X-ray source, or any other electromagnetic (EM) radiant source.
- the radiant source 206 may be one that emits radiant EM energy at multiple wavelengths, one that emits radiant EM energy at a single wavelength, such as a laser, and one that emits both visible and invisible IR, UV, or any combination thereof.
- a cover is omitted from the radiant oven 200 for clarity.
- the analytical column 116 is typically fabricated from fused silica, which is transparent to EM radiant energy, the radiant EM energy output of the radiant source 206 must be converted to heat to be transferred to the analytical column 116 .
- an inner surface of the insert 300 is coated with a substance that receives and absorbs radiant EM energy from the radiant source 206 and converts the radiant EM energy to heat. The heat is transmitted via conduction through the wall of the insert 300 and, in one embodiment, directly transmitted via conduction to the analytical column 116 , which is in direct contact with the outer surface of the insert 300 .
- the analytical column 116 can be separated from the outer surface of the insert 300 by an air gap, in which case the heat from the insert 300 is transmitted to the analytical column 116 via convection.
- the insert 300 can be fabricated using, for example, aluminum, copper, or another material that can be treated, coated, or otherwise configured to absorb EM radiant energy on one surface, convert the radiant EM energy to heat, and transfer the heat to another surface.
- FIG. 3 is a schematic diagram illustrating a cross-sectional view of the radiant oven 200 of FIG. 2 .
- the radiant oven 200 includes a housing 202 in which the insert 300 is located.
- the housing 202 also includes the radiant source 206 and pedestal 216 .
- the control circuitry 212 is depicted as a separate element, but in practice would likely be integrated within the housing 202 .
- an analytical column 116 is tightly wrapped around an outer surface 306 of the insert 300 .
- the temperature sensor 208 is secured, for example by bonding, to the outer surface 306 of the insert 300 .
- An inner surface 304 of the insert 300 is treated or otherwise coated with a substance 310 that is configured to absorb the radiant EM energy emitted from the radiant source 206 and convert the radiant EM energy to heat.
- the insert 300 can be aluminum and the inner surface 304 can be anodized to form a black, or dark, surface. The dark surface absorbs the radiant EM energy emitted from the radiant source 206 and converts the radiant EM energy to heat.
- the heat is transmitted through the wall of the insert 300 via conduction.
- the heat is then transferred to the analytical column 116 via, in this embodiment, conduction.
- the radiant oven 200 also includes an upper reflector 232 and a lower reflector 234 .
- the upper reflector 232 and the lower reflector 234 reflect radiant EM energy toward the inner surface 304 of the insert 300 .
- the upper reflector 232 and the lower reflector 234 are preferably fabricated from a material that is reflective at the wavelength of the output of the radiant source 206 .
- a typical IR reflector material is metal, preferably gold, which is highly resistant to oxidation.
- the radiant oven 300 also includes insulation portions 222 , 224 and 226 to maintain the interior of the oven 200 at the desired temperature. In this embodiment, the insulation 224 and the upper reflector 232 form a cover 236 .
- the temperature sensor 208 precisely determines the temperature of the outer surface 306 of the insert 300 , and therefore, the temperature of the analytical column 116 .
- the temperature sensor 208 still provides a precise temperature measurement of the analytical column 116 by locating the temperature sensor in the air gap.
- a feedback signal provided from the temperature sensor 208 via connection 238 to the control circuitry 212 can be used to control the duty cycle at which the radiant source operates, and thereby precisely control the temperature in the radiant oven 200 .
- Positioning the insert 300 vertically in the oven 200 minimizes radiant energy gradients due to natural convection when the diameter of the insert is larger than the height. Positioning the insert so that the smaller of the diameter or the height in the direction of the plane of gravity minimizes the effects of natural convection.
- the radiant source 206 may be controlled, or modified, to minimize the effects of natural convection.
- the insert may be positioned horizontally if the height is larger than the diameter.
- FIGS. 4A and 4B are schematic diagrams collectively illustrating plan and side views of an embodiment of the insert of FIGS. 2 and 3 .
- FIG. 4A is a plan view of the insert 300 .
- the insert 300 comprises a body 302 that can be fabricated from an efficient heat conductive material, such as, for example, aluminum or copper.
- the insert 300 comprises an inner surface 304 and an outer surface 306 .
- the insert 300 is aluminum and the inner surface 304 is anodized to form a dark, and preferably black, surface.
- the inner surface 304 is configured to absorb the radiant EM energy emitted by the radiant source 206 and convert the radiant EM energy to heat. The heat is conducted through the wall between the inner surface 304 and the outer surface 306 .
- an analytical column 116 is either in direct contact with or in close proximity to the outer surface 306 . In this manner, heat from the outer surface 306 is coupled, either via conduction or convection, to the analytical column 116 .
- the dark inner surface 304 can alternatively have a coating 310 with a property that allows it to absorb the radiant EM energy emitted by the radiant source 206 and convert the radiant EM energy to heat.
- FIG. 4B is a schematic side view of the insert 300 of FIG. 4A .
- An analytical column 116 is tightly wrapped around the outer surface 306 of the insert 300 .
- the insert 300 is approximately 123.5 millimeters (mm) in diameter, 66.9 mm in height and has a wall thickness of approximately 1 mm.
- the insert may take other shapes or profiles.
- the insert 300 may take a shape in which the height is greater than the diameter.
- FIG. 5 is a schematic view illustrating an alternative embodiment 400 of the insert 300 of FIG. 3 .
- the analytical column 116 is attached to the outer surface 406 of the insert 400 in such a way so that an air gap 415 is created between the analytical column 116 and the outer surface 406 .
- the analytical column 116 may be loosely wound around the outer surface 406 and attached using mounting points 410 , approximately as shown. Heat is transferred from the outer surface 406 across the air gap 415 to the analytical column 116 via convection. While not in direct contact with the outer surface 406 , the temperature of the analytical column 116 is still precisely controlled, and can be rapidly heated and cooled.
- FIG. 6 is a flowchart 500 illustrating the operation of a method for efficiently heating an analytical column.
- the blocks in the flowchart illustrate the operation of one embodiment of the invention and can be executed in the order shown, out of the order shown or in parallel.
- a radiant source is provided in block 502 .
- the output of the radiant source is directed to the inner surface of the insert 300 .
- the insert 300 converts the radiant energy to heat.
- an analytical column is secured around the outer surface of the insert 300 .
- heat is transferred form the insert 300 to the analytical column 116 .
Abstract
Description
- Many chemical separation analyses, such as gas and liquid chromatography, require the chemical sample to be temperature-controlled throughout the analysis. A chromatograph comprises an inlet where the sample is introduced, an oven containing an analytical column where the separation takes place, and a detector where the constituents of the sample are detected and recorded. Each of these parts of the instrument is temperature-controlled to ensure the integrity and repeatability of the analysis. An analysis performed at a constant controlled temperature is referred to as isothermal. To perform an isothermal analysis, the analytical column is typically placed in a temperature-controlled chamber, often referred to as an oven that is preheated to the desired temperature. A non-isothermal analysis, where the column temperature is gradually raised over time, is also common, especially for samples with relatively massive components that would otherwise take a long time to elute from the column.
- Conventional chromatographic ovens typically use convection technology to heat and maintain the interior of the chamber, and hence the column, at the desired temperature. However, conventional ovens are relatively large in comparison to an analytical column which they are intended to heat and, as a result, are very power inefficient. In addition to cost, a side effect of power inefficiency is that the oven is slow to heat and cool, resulting in reduced sample throughput and productivity.
- One prior solution to reduce power consumption when heating an analytical column is to use a resistively heated analytical column. Unfortunately, this technology requires a specially fabricated column that may be incompatible with existing chromatography systems. In addition, an analytical column is susceptible to contamination at its input usually due to sample build-up over time. The contaminated portion of the analytical column is typically removed so the column can be reused. This is difficult or impossible to do when using a resistively heated column since the column and heating element are bundled together. Further, it is difficult to precisely determine the temperature of a resistively heated analytical column because it is difficult to place a temperature probe so that its temperature tracks the temperature of the resistively heated column precisely.
- Another prior solution to reduce power consumption when heating an analytical column is to use an electromagnetic (EM) radiant source, such as a microwave or infrared source. Unfortunately, capillary columns, which represent the overwhelming majority of analytical columns used in gas chromatographic analyses today, are typically fabricated from fused silica glass, which is transparent to radiant energy. To take advantage of being heated by radiant energy the analytical column must be coated, or otherwise treated, with a material or substance that can absorb the radiation emitted from the radiant source and convert the radiant energy to heat. Also, as with the resistively heated analytical column, determining the precise temperature of an analytical column heated by a radiant source is difficult because it is difficult to ensure that a temperature probe absorbs and converts the radiant energy to heat in the same way as the column to provide an accurate measure of the column temperature. Finally, the directional or “line-of-sight” nature of an EM radiant source adds a potential source of temperature gradients across the column that would not be present in a conventional convection oven.
- Therefore, it would be desirable to efficiently heat a conventional analytical column and accurately determnine its temperature.
- According to one embodiment, a radiant oven comprises a radiant energy source configured to provide radiant electromagnetic energy, an insert configured to receive the radiant electromagnetic energy and convert the radiant electromagnetic energy into heat, and an additional element configured to receive the heat.
- Other embodiments and methods of the invention will be discussed with reference to the figures and to the detailed description of the preferred embodiments.
- The invention will be described by way of example, in the description of exemplary embodiments, with particular reference to the accompanying figures.
-
FIG. 1 is a schematic diagram illustrating a simplified chromatograph in which a radiant oven constructed in accordance with an embodiment of the invention may reside. -
FIG. 2 is a schematic diagram illustrating a perspective view of an embodiment of the radiant oven ofFIG. 1 . -
FIG. 3 is a schematic diagram illustrating a cross-sectional view of the radiant oven ofFIG. 2 . -
FIGS. 4A and 4B are schematic views collectively illustrating plan and side views of an embodiment of the insert ofFIGS. 2 and 3 . -
FIG. 5 is a schematic view illustrating an alternative embodiment of the insert ofFIG. 3 . -
FIG. 6 is a flowchart illustrating the operation of a method for efficiently heating an analytical column. - While described below for use in a gas chromatograph, the radiant oven to be described below can be used in any analysis application where it is desirable to quickly and efficiently heat and cool an analytical column or other device.
-
FIG. 1 is a block diagram illustrating asimplified gas chromatograph 100, which is one possible device in which the radiant oven of the invention may be implemented. The radiant oven of the invention may also be used in any gas phase sampling device or in any analytical device, and may also be useful for liquid chromatography applications. In addition, the radiant oven can be used in a stand-alone application. The radiant oven can be used to quickly and efficiently heat a capillary column, a packed column, or other analytical apparatus. - The
gas chromatograph 100 includes aninlet 112, which receives a sample of material to be analyzed viaconnection 102 and provides the sample viaconnection 114 to, for example, achromatographic column 116, also referred to as a capillary column, an analytical column, or just a column. To effectively separate compounds of interest during chromatography, theanalytical column 116 may be heated to temperatures well above ambient temperature. The temperature to which theanalytical column 116 is heated is dependent on the type of sample being analyzed and may vary during a sample run to analyze multiple compounds and elements from a single sample. Accordingly, theanalytical column 116 is located in a temperature chamber, also referred to as an oven. In this example, the oven is aradiant oven 200 constructed in accordance with embodiments of the invention. - The output of the
column 116 is connected viaconnection 118 to adetector 126 in thegas chromatograph 100. The output of thedetector 126, viaconnection 128 is a signal representing theresult 132 of the analysis. -
FIG. 2 is a schematic diagram illustrating a perspective view of an embodiment of theradiant oven 200 ofFIG. 1 . Theradiant oven 200 includes ahousing 202 having arecess 204. Therecess 204 is configured to releasably receive aninsert 300. Theinsert 300 is also sometimes referred to as a basket. Ananalytical column 116, which in this example is a chromatographic column, is wrapped around theinsert 300 so that theanalytical column 116 can be efficiently and uniformly heated and cooled in theoven 200. Theanalytical column 116 can be either tightly or loosely wrapped around the outer surface of theinsert 300, depending on application. In one embodiment, theanalytical column 116 is tightly wrapped around theinsert 300 to minimize the amount of exposed column surface area so that heat absorption is maximized. The input and output of theanalytical column 116 is omitted for drawing clarity. Atemperature sensor 208 can be secured to the outer surface of theinsert 300 to precisely determine the temperature of theinsert 300 and theanalytical column 116. - The
oven 200 also includes aradiant source 206 andcontrol circuitry 212 configured to control the duty cycle of the power supplied to the radiant source. Thecontrol circuitry 212 uses information fed back from thetemperature sensor 208 to determine the power required to achieve and maintain the temperature in theradiant oven 200 at a set point prescribed by the analysis. The duty cycle is the fraction of ON time of the radiant source relative to the total cycle (ON+OFF) time. In addition to controlling the duty cycle of theradiant source 206 it is often important to control the total cycle time as well. For example, a duty cycle of 20% can be achieved with an ON time of 2 minutes vs. a total time of 10 minutes or an ON time of 2 seconds vs. a total time of 10 seconds, etc. Although the duty cycle is the same, the total cycle times are quite different. The total cycle time (10 minutes, 10 seconds, 10 milliseconds, etc.) plays an important role for radiant sources having fast reaction times such as a quartz halogen infrared (IR) radiant source. When the total cycle time is too long for a quartz halogen IR radiant source, the filament can cool significantly between cycles. Repeated heating and cooling of the filament in a quartz halogen IR radiant source causes fatigue and shortens the life of the filament. Many quartz halogen radiant source manufacturers suggest using “phase-angle fired” control where the total cycle time can be as small as a fraction of one cycle of the AC input power. - The
radiant oven 200 optionally includes afan 214, or other means for quickly cooling theoven 200. Theradiant source 206 can be mounted on apedestal 216. In one embodiment, theradiant source 206 is a quartz halogen IR bulb having a cylindrical profile. However, the shape of theradiant source 206 may differ. The radiant source can be an infrared (IR) source as mentioned above, a microwave source, an ultraviolet (UV) source, a visible (VIS) source, an X-ray source, or any other electromagnetic (EM) radiant source. In addition, theradiant source 206 may be one that emits radiant EM energy at multiple wavelengths, one that emits radiant EM energy at a single wavelength, such as a laser, and one that emits both visible and invisible IR, UV, or any combination thereof. A cover is omitted from theradiant oven 200 for clarity. - Because the
analytical column 116 is typically fabricated from fused silica, which is transparent to EM radiant energy, the radiant EM energy output of theradiant source 206 must be converted to heat to be transferred to theanalytical column 116. In accordance with an embodiment of the invention, and as will be further described below, an inner surface of theinsert 300 is coated with a substance that receives and absorbs radiant EM energy from theradiant source 206 and converts the radiant EM energy to heat. The heat is transmitted via conduction through the wall of theinsert 300 and, in one embodiment, directly transmitted via conduction to theanalytical column 116, which is in direct contact with the outer surface of theinsert 300. In an alternative embodiment, theanalytical column 116 can be separated from the outer surface of theinsert 300 by an air gap, in which case the heat from theinsert 300 is transmitted to theanalytical column 116 via convection. Theinsert 300 can be fabricated using, for example, aluminum, copper, or another material that can be treated, coated, or otherwise configured to absorb EM radiant energy on one surface, convert the radiant EM energy to heat, and transfer the heat to another surface. -
FIG. 3 is a schematic diagram illustrating a cross-sectional view of theradiant oven 200 ofFIG. 2 . Theradiant oven 200 includes ahousing 202 in which theinsert 300 is located. Thehousing 202 also includes theradiant source 206 andpedestal 216. InFIG. 3 , thecontrol circuitry 212 is depicted as a separate element, but in practice would likely be integrated within thehousing 202. - As shown in
FIG. 3 , ananalytical column 116 is tightly wrapped around anouter surface 306 of theinsert 300. Thetemperature sensor 208 is secured, for example by bonding, to theouter surface 306 of theinsert 300. Aninner surface 304 of theinsert 300 is treated or otherwise coated with asubstance 310 that is configured to absorb the radiant EM energy emitted from theradiant source 206 and convert the radiant EM energy to heat. For example, theinsert 300 can be aluminum and theinner surface 304 can be anodized to form a black, or dark, surface. The dark surface absorbs the radiant EM energy emitted from theradiant source 206 and converts the radiant EM energy to heat. The heat is transmitted through the wall of theinsert 300 via conduction. The heat is then transferred to theanalytical column 116 via, in this embodiment, conduction. - The
radiant oven 200 also includes anupper reflector 232 and alower reflector 234. Theupper reflector 232 and thelower reflector 234 reflect radiant EM energy toward theinner surface 304 of theinsert 300. Theupper reflector 232 and thelower reflector 234 are preferably fabricated from a material that is reflective at the wavelength of the output of theradiant source 206. A typical IR reflector material is metal, preferably gold, which is highly resistant to oxidation. Theradiant oven 300 also includesinsulation portions oven 200 at the desired temperature. In this embodiment, theinsulation 224 and theupper reflector 232 form acover 236. - The
temperature sensor 208 precisely determines the temperature of theouter surface 306 of theinsert 300, and therefore, the temperature of theanalytical column 116. In another embodiment in which theanalytical column 116 may be separated from theouter surface 306 of theinsert 300 by an air gap, thetemperature sensor 208 still provides a precise temperature measurement of theanalytical column 116 by locating the temperature sensor in the air gap. A feedback signal provided from thetemperature sensor 208 viaconnection 238 to thecontrol circuitry 212 can be used to control the duty cycle at which the radiant source operates, and thereby precisely control the temperature in theradiant oven 200. - Positioning the
insert 300 vertically in theoven 200 minimizes radiant energy gradients due to natural convection when the diameter of the insert is larger than the height. Positioning the insert so that the smaller of the diameter or the height in the direction of the plane of gravity minimizes the effects of natural convection. Alternatively, theradiant source 206 may be controlled, or modified, to minimize the effects of natural convection. In another embodiment, the insert may be positioned horizontally if the height is larger than the diameter. -
FIGS. 4A and 4B are schematic diagrams collectively illustrating plan and side views of an embodiment of the insert ofFIGS. 2 and 3 .FIG. 4A is a plan view of theinsert 300. Theinsert 300 comprises abody 302 that can be fabricated from an efficient heat conductive material, such as, for example, aluminum or copper. Theinsert 300 comprises aninner surface 304 and anouter surface 306. In one embodiment, theinsert 300 is aluminum and theinner surface 304 is anodized to form a dark, and preferably black, surface. Theinner surface 304 is configured to absorb the radiant EM energy emitted by theradiant source 206 and convert the radiant EM energy to heat. The heat is conducted through the wall between theinner surface 304 and theouter surface 306. As described above, ananalytical column 116 is either in direct contact with or in close proximity to theouter surface 306. In this manner, heat from theouter surface 306 is coupled, either via conduction or convection, to theanalytical column 116. The darkinner surface 304 can alternatively have acoating 310 with a property that allows it to absorb the radiant EM energy emitted by theradiant source 206 and convert the radiant EM energy to heat. -
FIG. 4B is a schematic side view of theinsert 300 ofFIG. 4A . Ananalytical column 116 is tightly wrapped around theouter surface 306 of theinsert 300. In one embodiment, theinsert 300 is approximately 123.5 millimeters (mm) in diameter, 66.9 mm in height and has a wall thickness of approximately 1 mm. However, the insert may take other shapes or profiles. For example, theinsert 300 may take a shape in which the height is greater than the diameter. -
FIG. 5 is a schematic view illustrating analternative embodiment 400 of theinsert 300 ofFIG. 3 . InFIG. 5 , theanalytical column 116 is attached to theouter surface 406 of theinsert 400 in such a way so that anair gap 415 is created between theanalytical column 116 and theouter surface 406. For example, theanalytical column 116 may be loosely wound around theouter surface 406 and attached using mountingpoints 410, approximately as shown. Heat is transferred from theouter surface 406 across theair gap 415 to theanalytical column 116 via convection. While not in direct contact with theouter surface 406, the temperature of theanalytical column 116 is still precisely controlled, and can be rapidly heated and cooled. -
FIG. 6 is aflowchart 500 illustrating the operation of a method for efficiently heating an analytical column. The blocks in the flowchart illustrate the operation of one embodiment of the invention and can be executed in the order shown, out of the order shown or in parallel. In block 502 a radiant source is provided. Inblock 504 the output of the radiant source is directed to the inner surface of theinsert 300. In block, 506, theinsert 300 converts the radiant energy to heat. Inblock 508, an analytical column is secured around the outer surface of theinsert 300. Inblock 510, heat is transferred form theinsert 300 to theanalytical column 116. - The foregoing detailed description has been given for understanding exemplary implementations of the invention and no unnecessary limitations should be understood therefrom as modifications will be obvious to those skilled in the art without departing from the scope of the appended claims and their equivalents.
Claims (24)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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US11/111,111 US7130534B1 (en) | 2005-04-21 | 2005-04-21 | Gas chromatograph having a radiant oven for analytical devices |
DE102005052291A DE102005052291A1 (en) | 2005-04-21 | 2005-11-02 | Radiant furnace for analysis devices |
CNU200620019005XU CN200962103Y (en) | 2005-04-21 | 2006-03-29 | Radiation cavity for analysis device |
JP2006116730A JP4764762B2 (en) | 2005-04-21 | 2006-04-20 | Radiation oven for analyzer |
GB0607820A GB2425701B (en) | 2005-04-21 | 2006-04-20 | Radiant Oven For Analytic Devices |
US11/523,180 US7409850B2 (en) | 2005-04-21 | 2006-09-19 | Systems and methods for maximizing heat transfer efficiency to and minimizing thermal gradients in an analytic column |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US11/111,111 US7130534B1 (en) | 2005-04-21 | 2005-04-21 | Gas chromatograph having a radiant oven for analytical devices |
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US11/434,963 Continuation-In-Part US7559226B2 (en) | 2005-04-21 | 2006-05-16 | Radiant thermal energy absorbing analytical column |
US11/523,180 Continuation-In-Part US7409850B2 (en) | 2005-04-21 | 2006-09-19 | Systems and methods for maximizing heat transfer efficiency to and minimizing thermal gradients in an analytic column |
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US11/523,180 Active US7409850B2 (en) | 2005-04-21 | 2006-09-19 | Systems and methods for maximizing heat transfer efficiency to and minimizing thermal gradients in an analytic column |
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US20070266767A1 (en) * | 2006-05-16 | 2007-11-22 | Traudt Sammye E | Radiant thermal energy absorbing analytical column |
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Also Published As
Publication number | Publication date |
---|---|
GB0607820D0 (en) | 2006-05-31 |
CN200962103Y (en) | 2007-10-17 |
GB2425701B (en) | 2008-12-03 |
US20070009241A1 (en) | 2007-01-11 |
DE102005052291A1 (en) | 2006-11-02 |
JP2006300951A (en) | 2006-11-02 |
US7130534B1 (en) | 2006-10-31 |
JP4764762B2 (en) | 2011-09-07 |
GB2425701A (en) | 2006-11-01 |
US7409850B2 (en) | 2008-08-12 |
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