DM8116type

MWDXRF micro sulfur analyzer

satisfyNational V, NationalVIUltra low for automotive gasoline and dieselStesting requirements

Low detection limit（300s）：

0.33 ppm

use

monochromeExcitation wavelength dispersionXX-ray fluorescence(MWDXRF)analysis technique

High diffraction efficiencyLogarithmic spiralrotational hyperboloid(LSDCC)intraocular lens

reasonablekV、mA、Target material combinationMicro focal spotThin beryllium windowXX-ray tube

Compliant with standards:

GB/T 11140

ISO20884

SH/T 0842

ASTM D2622

ASTM D7039

ASTM D7220

overview

DM8116Type monochrome excitation wavelength dispersionXX-ray fluorescence micro sulfur analyzer,abbreviationDM8116typeMWDXRFMicro sulfur analyzer,Our company has been collecting data for decadesXThe research experience of fluorescence spectrometer, in the company's existingDMseriesXFluorescence sulfur analyzerXFluorescence multi-element analyzer, wavelength dispersion analyzerXOur company has developed and launched its first point-to-point monochromatic excitation system based on X-ray fluorescence multi-channel spectrometer and other technologiesXRFa spectrometer.It adopts the following technologies and devices,Make use of50WLight pipeDM8116With excellent reproducibility and stability, low detection limit, modern technology has been fully utilized.

Point to point focusing monochromatic excitation wavelength dispersionXX-ray fluorescence(MWDXRF)analysis technique

XDetection limit of X-ray fluorescence spectrometerLOD（Limit Of Detection）It refers to the standard deviation of the instrument background signal generated by the blank matrix3The corresponding amount of multiple value, namely:

（1）

In the formula,R_bCount the intensity of the background (background),NGiven the concentrationCThe counting intensity of low concentration samples,TTo measure time. From formula（1）It can be seen that the detection limit and sensitivity（N-R_b）/CInversely proportional to the backgroundR_bThe square root is proportional. To reduce the detection limit under a certain measurement time, it is necessary to increase sensitivity and/or reduce background.

picture1. MWDXRFSchematic diagram of analytical technology

DM8116Using point-to-point focusing monochromatic excitation wavelength dispersionXX-ray fluorescence(Monochromatic Excitation BeamWavelength Dispersive X-Ray Fluorescence)Analysis technology is to use a point-to-point focusing optical device in the excitation light path toXMonochromatization of the X-ray tube emission spectrum to reduce the continuous scattering background of the sample fluorescence spectrum, while achieving three-dimensional focusing to increase the required excitationXThe intensity of monochromatic lines or narrow energy bands of radiation is used to improve sensitivity. Another point-to-point focusing optical device is used in the detection path to separate the fluorescence spectrum for high-resolution detection. At the same time, three-dimensional focusing is achieved to increase the intensity of the required sample characteristic fluorescence lines to improve sensitivity, thereby greatly reducing the detection limit. Compared to traditionalEDXRF1Reduced2toAn order of magnitude, compared to traditional high-power (such as...)4kwofWDXRF

It's also much lower.picture2. The emission spectrum of the X-ray tube, andwarpLSDCCCharacteristics of monochromatizationX

X-ray incidence spectrum

High diffraction efficiency logarithmic spiral rotation point-to-point focusing artificial monochromatic crystalHyperbolic diffraction crystalDCC（Doubly CurvedCrystals）Except for meetingBragg2Law（

）In addition, it also achieves point-to-point focusing to have a large collection solid angle, so it has excellent monochromatization and extremely high efficiency. nλ=2dsinθ2（

）DCCAccording to its surface, it can be further divided into semi focusing（Johann）, Full Focus（Johansson）And logarithmic spiral（Logarithmic Spiral）Wait. Among them, semi focusing only partially satisfies the diffraction conditions and is the worst. Although full focusing fully satisfies diffraction conditions and is point-to-point focusing, its manufacturing process is extremely complex, requiring a grinding process in addition to bendingRThe process of curved surfaces is extremely difficult to grind natural crystals, while artificial crystals cannot be ground. In addition, natural crystals are usually monochromatized too well, which leads to the characteristics of the target materialX

Only a part of the radiation is diffracted, and the integral diffraction rate is low.3. pictureLSDCC

Principle diagram of point-to-point focusingDM8116The logarithmic spiral rotating dual surface artificial crystal usedDM30L2It is a collection of our company's technical elitesA patented product developed through years of diligent research and development.Logarithmic spiralDCCIt also fully satisfies the diffraction conditions. Although the focusing is not point-to-point, but on the opposite side of the point, it can be considered point-to-point due to the small size of this surface.It usesDM3Artificial crystal, whose integral diffraction rate is the same as that of natural crystals10arrive

So the efficiency of this crystal is currently the highest in the world. In addition, it only needs to be bent without grinding or splicing, making it easy to manufacture.reasonablekV、mAMicro focal spot thin beryllium window with target material combinationX

X-ray tubeStimulating the sampleXThe closer the radiation energy is to the absorption limit of the element being analyzed, the higher the excitation efficiency.DM30LCrystals only diffractXHigh intensity characteristics in the emission spectrum of the X-ray tubeXRadiation is emitted by the target material. So a reasonable selection of target materials can achieve the highest excitation efficiency. After selecting the target materialXWhen the maximum power of the ray tube is constant, such as50WReasonable high pressure of light tube（kV）And current（mA）The combination can achieve maximum excitation efficiency. Due to the use of point-to-point focusing, it is necessary to use micro focal spotsXLight tube. Due to the characteristics of the target materialXThe radiation energy is very low, so a thin beryllium window must be usedX

Radiation tube.DM8116useAgtarget50WMicro focal spot thin beryllium windowXRadiation tube, and forkV、mA

Make a reasonable combination.

scope of applicationSuitable for refineries, testing and certification agencies, oil depots, laboratoriesmeasureScope from1ppmarrive10%ofVarious types of oil products(Such as gasoline, diesel, heavy oil, residual fuel oil, etc)Additives, lubricants containing additives, and products during refining processesS

Measurement of elements.It is also applicable to any material in various industriesS

Measurement of Elements

characteristicFast and Accurate–The required measurement time is extremely short, usually giving the content result in a few tens of seconds.

Has extremely high reproducibility and reproducibility.Low detection limit–Adopting advanced technologyMWDXRFTechnology,LSDCC

Core technology achieves extremely low detection limits.long term stability–Adopting variable gain digital multi-channel,havePHAAutomatic adjustment, drift correction, deviation correction and other functions，

Has excellent long-term stability.Environmental protection and energy saving–Radiation protection meets exemption requirements.

During analysis, there is no contact or damage to the sample, no pollution, no need for chemical reagents, and no need for combustion.Easy to use–Touch screen operation. The sample is directly loaded into the sample cup, and after placing it in the instrument, simply press the button[start]

Just press the key, truly achieving one click operation.high reliability–Integrated design,High degree of integration, strong environmental adaptability, strong anti-interference ability, and high reliability

.high performance-price ratio–

No gas cylinder is required, and the operation and maintenance costs are extremely low. The price is half of similar foreign products. It is a truly cost-effective product.

calibration7Using known amountsindividualcontainS7Calibrate the instrument with the sample and obtain the graph

The work curve.picture5. S

Sample working curveThe correlation coefficient of this working curveγ0.999All greater than, indicatingDM8116

The linear error of the sulfur analyzer is extremely small.

accuracyIn order to further test the accuracy of the analysis, five samples of diesel and light oil with different sulfur contents were prepared, and each sample was loaded into two different sample cups for analysisS

Accuracy test:1. outsideDetermine with five unknown samplesS

gasoline1outsideThe measured concentration results are shown（ppm）, as well as comparison with nominal values. These results indicate that at low concentration levelsDM8116The spectrometer can achieveS

Excellent accuracy.

accuracyFor the three types, each containing seven different onesSample CupConduct gasoline sample testingS

Repetitive test:2.outsideSGasoline sampleSanalysisofRepeatability test

2.60%2outsideThese results indicate that at low concentration levelsDM8116The sulfur analyzer can achieveS

Excellent repeatability.