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Chromatograph

A chromatograph and thermostat technology, applied in the field of chromatograph

Active Publication Date: 2020-12-22
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if you want to measure with multiple wavelengths, you need to install multiple LED elements with different wavelengths

Method used

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  • Chromatograph
  • Chromatograph
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Examples

Experimental program
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Effect test

Embodiment approach

[0045] (1) In the liquid chromatograph 1 described above, although the LED control unit 31a is configured to calculate the upper limit value I of the driving current based on the ambient temperature t and the thermal resistance (for example, 45°C / W) of the UVLED element 21a and the UVLED element 21b UP , but instead, it may also be configured to use "ambient temperature t - upper limit value I of drive current UP table" to calculate the upper limit value of the drive current I UP .

[0046] (2) In the above-mentioned liquid chromatograph 1, although the LED control unit 31a is configured to calculate the upper limit value I of the driving current after the temperature control unit 41a judges that the temperature t' of the thermostat is stable at the set temperature, UP , but instead of it, it may also be configured to execute the calculation of the upper limit value I of the driving current only when the user inputs " UP function", calculate the upper limit value of the driv...

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Abstract

To provide an absorbance detector and a chromatograph that can always obtain the maximum amount of light without suppressing the driving current even if they are arranged in a column oven. The absorbance detector is equipped with: absorbance detector pool (20), including: a light emitting part (21) having an LED element (21a), an LED element (21b), a light receiving part (22) having a photodiode (22a) and a light emitting part arranged on The pool part (23) between the part (21) and the light receiving part (22) and accommodates the sample; the LED control part (31a) outputs the drive current to the LED element (21a) and the LED element (21b); the temperature sensor (21d ), detect the ambient temperature of the LED element (21a) and the LED element (21b), and the LED control unit (31a) decides to output to the LED element (21a), the LED element (21b) based on the ambient temperature detected by the temperature sensor (21d). The upper limit value of the drive current.

Description

technical field [0001] The present invention relates to a chromatograph equipped with an absorbance detector. Background technique [0002] Absorbance photometry is also used as an official method for quantifying various substances, and is adopted in various fields as a highly versatile measurement method. In order to perform measurement by such absorptiometry, an absorbance detector for detecting the degree of absorption of light by a sample to be measured, that is, the absorbance is required. [0003] The absorbance detector is composed of a light-emitting unit, a light-receiving unit, and a cell for accommodating a sample, and the cell is arranged on a measurement optical path between the light-emitting unit and the light-receiving unit. Although the light emitting part differs depending on the wavelength to be measured, when measuring the wavelength in the visible light region, a tungsten lamp or a halogen lamp is used, and the light from the light source is separated b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33G01N21/01
CPCG01N21/31G01N2201/0627G01N2201/069H05B45/18G01N30/74G01N2030/3084G01N21/01G01N21/33G01N30/02G01N2030/027
Inventor 中村恭章
Owner SHIMADZU SEISAKUSHO CO LTD