Nephelometric turbidimeter and method for detection of the contamination of a sample cuvette of a nephelometric turbidimeter

A technology of turbidimeter and test tube, which is applied in the direction of optical testing of flaws/defects, measuring devices, and measurement of scattering characteristics. It can solve problems such as heavy technical work, strong inhomogeneity of liquid samples, and unreasonable measurement results.

Active Publication Date: 2016-06-01
HACH LANGE HACH LANGE
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Problems solved by technology

It is technically laborious and strong inhomogeneities within the liquid sample can lead to unreasonable measurement results

Method used

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  • Nephelometric turbidimeter and method for detection of the contamination of a sample cuvette of a nephelometric turbidimeter
  • Nephelometric turbidimeter and method for detection of the contamination of a sample cuvette of a nephelometric turbidimeter
  • Nephelometric turbidimeter and method for detection of the contamination of a sample cuvette of a nephelometric turbidimeter

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Embodiment Construction

[0032]A nephelometer 10 for measuring and detecting the turbidity of a liquid sample 49 in a sample tube 40 is shown in the drawing. In this embodiment, the nephelometer 10 is a so-called process device rather than a so-called laboratory device. Thus, the nephelometer has a sample inlet and a sample outlet configuration (not shown in the figures) and pumps a liquid sample into the cuvette 40 continuously or discontinuously. The test tube 40 is not replaced for a long time, for example not for several days or even several months.

[0033] The turbidity of the liquid is an indication of the concentration of solid particles suspended in the liquid sample 49 . Turbidity is determined by projecting a light beam 62 into the liquid sample 49 and measuring the light intensity of light scattered by the liquid sample 49 at an angle of 90° with respect to the longitudinal axis of the light beam in the liquid sample 49 .

[0034] Nephelometer 10 has a housing with openings at its top en...

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Abstract

The invention refers to a nephelometric turbidimeter (10) for measuring a turbidity of a liquid sample (49) in a sample cuvette (40). The turbidimeter (10) comprises: a measurement light source (20) for emitting an axial parallel light beam (60) directed to the cuvette (40), a scattering light detector (30) arranged to receive scattered light (66) coming not-axially from the cuvette (40), and a switchable diffuser (50) with an optical diffuser body (52) and a diffuser actuator (54) for moving the diffuser body (52, 52') between a parking position in which the diffuser body (52) does not interfere with the emitted light beam (60) and a test position between the light source (20) and the cuvette (40) in which the diffuser body (52') interferes with the emitted light beam (60) to generate diffuse test light (63) entering the cuvette (40).

Description

technical field [0001] The present invention relates to a nephelometer for measuring the turbidity of a liquid sample in a transparent sample test tube. Background technique [0002] Nephelometers determine the concentration of solid particles suspended in a liquid sample within a sample tube by projecting a beam of light into the liquid sample within the tube. A light detector detects the amount of light scattered by the suspended solid particles at an angle of at least 30° relative to the axis of the beam, preferably at a right angle to the axis of the beam. However, not only particles suspended in a liquid sample produce scattered light, but any light contamination of the tube (such as a layer of dirt on the inner wall of a transparent tube or scratches on the body of the tube) may also scatter light. [0003] US2011 / 0043807A1 discloses a turbidimeter having two independent light sources and two independent light detectors, thereby providing different turbidity measureme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/15G01N21/51
CPCG01N21/15G01N21/51G01N21/94G01N2021/152G01N2021/157G01N2021/4726G01N2201/0634G01N21/47G01N21/4785G01N2021/473
Inventor M.巴特费尔德M.库斯曼B.德海B.加斯纳F.斯坦豪尔H-J.孔普赫A.莱耶M.库珀斯A.格利茨A.米特赖特C.汉施克L.海德曼斯
Owner HACH LANGE HACH LANGE
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