Abstract:
PROBLEM TO BE SOLVED: To provide a driving method for a fluid circuit control valve used for analysis equipment, which contributes to improvement in properties of valve closing and the like.SOLUTION: An embodiment 10 of a valve includes: an inlet 14, an outlet 16 and a passageway 18 connecting the inlet 14 and the outlet 16; a flow determining component 22 for allowing communication/blocking of the passageway 18; and a voice coil-type linear positioning component 26 that is arranged to operate the flow determining component 22 to determine communication/blocking of a flow path, wherein a control signal directed to the linear positioning component 26 is computer-controlled to achieve reliable valve sealing properties, rapid responsiveness, and improved controllability in a small flow rate, and the displacement of an actuator 38 for operating the flow determining component 22 is detected to improve control accuracy.
Abstract:
PROBLEM TO BE SOLVED: To provide an assembly for mixing fluids (i.e., gases or liquids).SOLUTION: Disclosed is an assembly that accurately mixes two or more high-pressure fluid sources and is adapted for use in applications, such as, for example, chromatography. A mixer assembly 100 includes, inter alia, a housing 10, an inlet fitting 40, and a mixer cartridge assembly 60. The housing 10 has a fluid receiving section 16 and a fluid discharge section 18 with an outlet 20 formed therein. A central bore 22 extends between the fluid receiving section 16 and the fluid discharge section 18. The inlet fitting 40 is engaged with the housing 10 and has a first port 42 and a second port 44 formed therein that extend from the fitting exterior to the fluid receiving section 16 of the housing 10.
Abstract:
PROBLEM TO BE SOLVED: To improve the signal-to-noise ratio of measurements made using a self-scanned photodiode array to detect UV, visible, and IR portions of a spectrum in a spectro-photometer.SOLUTION: A self scanning photodiode array allows low signal pixels to accumulate charge for multiples of predetermined exposure time tbefore being read. The pattern of exposures, the integers M, where i runs from 1 to N, the number of pixels in the array, is chosen such that the pixels accumulate as much charge as possible without exceeding saturation.
Abstract translation:要解决的问题:提高使用自扫描光电二极管阵列进行的测量的信噪比,以检测分光光度计中的光谱的UV,可见光和IR部分。 解决方案:自扫描光电二极管阵列允许低信号像素在读取之前对预定曝光时间t 0 SB>的倍数累积电荷。 曝光模式,整数M i SB>,其中我从1到N运行阵列中的像素数,使得像素累积尽可能多的电荷 不超过饱和。 版权所有(C)2012,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide nano-scale microfluidic HPLC instruments that offer similar ease-of-use and reliable operation to that of prior analytical-scale or microbore-scale instruments by providing any or all of the following advantages of the reduced length and/or number of sections of interconnect tubing, easier fabrication, lower-cost fabrication, improved ease-of-use of capillary-scale and nano-scale LC, reduced dead-volume, reduced size, disposable devices, integrated devices, small devices, and high-pressure liquid chromatography in diffusion-bonded monoliths.SOLUTION: An HPLC apparatus includes a heat exchanger formed from diffusion-bonded first and second titanium substrates. At least two conduits for counterflow are defined between the first and second substrates.
Abstract:
The present disclosure relates to methodologies, systems and apparatus for cooling pump heads and providing balanced cooling and heat transfer between multiple pump heads. Multi-pump systems that are used to pump fluids that vary greatly in density with minor changes in temperature, such as the mobile phase of a C02-based chromatography system, require highly stable temperature conditions. In order to achieve a substantially equal average heat transfer between multiple pump heads and a coolant fluid, coolant fluid may be flowed through coolant passageways within the pump heads in a recursive and/or parallel coolant flow patterns. Such recursive and/or parallel coolant fluid flow patterns provide increased stability in temperature, compressibility, and density of the fluids passing through a multi-pump system.
Abstract:
The present disclosure relates to methodologies, systems and apparatus for cooling a supersaturated or mixed-phase solution to increase the solubility of gases dissolved therein. In a fluid chromatography system, the mobile phase may include a pressurized mixture including a gas, such as C02, and prior to fraction collection and/or detection a portion of the gas is extracted via a gas/liquid separator. Cooling the substantially liquid phase eluent exiting the gas/liquid separator increases the solubility of any remnant gas still dissolved within the eluent. The increased solubility of the remnant gas prevents out gassing, provides more consistent flow of the eluent through the system, and results in more efficient collection and analysis of a desired sample.
Abstract:
A liquid chromatography system includes a gradient proportioning valve in fluidic communication with sources of solvent. From the solvent sources, the gradient proportioning valve produces a low-pressure gradient stream. A first pump is in fluidic communication with the gradient proportioning valve to receive, pressurize, and move the pressurized low-pressure gradient stream to a flow-combining device. A second pump operates in parallel with the first pump and moves a pressurized solvent stream to the flow-combining device where the pressurized solvent stream combines with the low-pressure gradient stream to produce a high-pressure gradient stream. A second gradient proportioning valve can produce, from a second plurality of sources of solvent, a second low-pressure gradient stream, wherein the solvent stream moved by the second pump to the flow-combining device and combined with the other low-pressure gradient stream comprises the second low-pressure gradient stream.
Abstract:
The invention generally provides methods for improving the dynamic range of an absorbance detector and absorbance detectors having improved dynamic range. In an exemplary embodiment, the method includes receiving calibration data for a plurality of samples, the calibration data comprising an absorbance for a concentration of each of the samples, calculating a contribution of stray light to the calibration data, and correcting subsequent data by removing the contribution of stray light.
Abstract:
Exemplary embodiments of the present disclosure include systems, apparatuses, and methods that are directed to controlling pressure in a pressurized flow system, such as a C02-based chromatography system or other pressurized flow systems. Exemplary embodiments of the present disclosure comprise one or more apparatuses, systems or methods for implementing multiple pressure regulators to control pressure. In addition to providing pressure control, apparatuses, systems and methods described herein dampen damaging thermal effects caused by pressure drops of a mobile phase including C02.