GA-116 ASTM D7039 ASTM D2622 ASTM D4294 High Precision 0.33 PPM WDXRF Sulfur Analyzer X-ray Fluorescence Sulfur Tester Electronic Petroleum Analysis Machine
Meet the requirements of national V and National VI for ultra-low S detection of automotive gasoline and diesel
Low detection limit (300s) :0.33ppm
Adopt monochromatic excited wavelength dispersive X-ray fluorescence (MWDXRF) analysis technique
High diffraction efficiency logarithmic spiral rotating hyperboloid (LSDCC) intraocular crystals
Micro focal spot thin beryllium window X-ray tube with reasonable combination of kV, mA and target
Meet the standard:
GB/T 11140
ISO 20884
SH/T 0842
ASTM D2622
ASTM D7039
ASTM D7220
GA-116 ASTM D7039 ASTM D2622 ASTM D4294 High Precision 0.33 PPM WDXRF Sulfur Analyzer X-ray Fluorescence Sulfur Tester Electronic Petroleum Analysis Machine
Overview
GA-116 monochromatic excited wavelength dispersive X-ray fluorescence trace sulfur meter, referred to as GA-116 MWDXRF trace sulfur meter, is the company's collection of decades of X-ray fluorescence spectrometer research experience, The company's first point-to-point monochromatic excited XRF spectrometer was developed on the basis of the company's original DM series X-ray fluorescence sulfur analyzer, X-ray fluorescence multi-element analyzer, wavelength dispersive X-ray fluorescence multichannel spectrometer, etc. It uses the following technologies and devices to make the GA-116 with 50W optical tube with excellent reproducibility and stability, low detection limits, and has actually taken the detection level to a new level.
Point-to-point focusing monochromatic excited wavelength dispersive X-ray fluorescence (MWDXRF) analysis technique
The Limit Of Detection (LOD) of X-ray fluorescence spectrometer refers to the corresponding amount of 3 times the standard deviation of the instrument background signal generated by the matrix blank, namely:
(1)
Rb is the background (background) counting intensity, N is the counting intensity of low-concentration samples with known concentration of C, and T is the measurement time. From formula (1), it can be seen that the detection limit is inversely proportional to the sensitivity (N-Rb) /C and proportional to the square root of background Rb. In order to reduce the detection limit when the measurement time is fixed, it is necessary to improve the sensitivity and/or reduce the background.
Figure 1. Schematic diagram of MWDXRF analysis technology
GA-116 ASTM D7039 ASTM D2622 ASTM D4294 High Precision 0.33 PPM WDXRF Sulfur Analyzer X-ray Fluorescence Sulfur Tester Electronic Petroleum Analysis Machine
GA-116 uses point-to-point focused Monochromatic Excitation Beam Wavelength Dispersive X-Ray Fluorescence analysis technology, That is, a point-to-point focusing optical device is used in the excitation optical path to monochromatize the emission spectrum of the X-ray tube to reduce the continuous scattering background of the sample fluorescence spectrum, and at the same time, three-dimensional focusing is achieved to increase the intensity of the required monochromatized line or narrow energy band of the excited X-ray to improve the sensitivity. In the detection optical path, another point-to-point focusing optical device is used to split the fluorescence spectrum for high-resolution detection, and three-dimensional focusing is realized to increase the intensity of the characteristic fluorescence lines of the sample to be collected to improve the sensitivity, thus greatly reducing the detection limit. It is 1 to 2 orders of magnitude lower than the traditional EDXRF, and much lower than the traditional high-power (such as 4kw) WDXRF.
Figure 2. The outgoing spectrum of the X-ray tube and the incident spectrum of the characteristic X-ray monochromatized by LSDCC
High diffraction efficiency logarithmic spiral rotation point-to-point focusing artificial monochromatic crystals
Doubly Curved Crystals DCC (Doubly Curved Crystals) not only satisfy Bragg's law (2), but also achieve point-to-point focusing and thus have a large collection solid Angle, so they have excellent monochromization and extremely high efficiency.
nλ=2dsinθ (2)
According to its surface, DCC can be divided into half focusing (Johann), full focusing (Johansson) and Logarithmic Spiral. Among them, half focus only partially satisfies the diffraction conditions, which is the worst. Although full focusing is fully meet the diffraction conditions and is point-to-point focusing, but its manufacturing process is extremely complex, in addition to bending it must have a grinding to R surface process, natural crystals are very difficult to grind, and artificial crystals are impossible to grind. In addition, natural crystals are usually too monochromatic, resulting in only a part of the characteristic X-rays of the target being diffracted, and the integral diffraction rate is low.
Figure 3. Schematic diagram of LSDCC point-to-point focusing
GA-116 ASTM D7039 ASTM D2622 ASTM D4294 High Precision 0.33 PPM WDXRF Sulfur Analyzer X-ray Fluorescence Sulfur Tester Electronic Petroleum Analysis Machine
GA-116 using logarithmic spiral rotating hyperboloid artificial crystal DM30L, is the company's technical elite after 2 years of hard research and development of patented products. The logarithmic spiral DCC also fully satisfies the diffraction condition, although the focus is not point-to-point, but opposite the point, but because the surface is small, it can be considered point-to-point. It uses a DM intraocular lens, which has an integral diffraction rate three to 10 times that of natural crystals. In addition, it only needs to bend without grinding and splicing, making it easy to manufacture.
Micro focal spot thin beryllium window X-ray tube with reasonable combination of kV, mA and target
The closer the X-ray energy of the excited sample is to the absorption limit of the element to be analyzed, the higher the excitation efficiency. The DM30L crystal diffracts only the high-intensity characteristic X-rays in the emission spectrum of the X-ray tube, which are emitted by the target. Therefore, reasonable selection of target materials can obtain the highest excitation efficiency. After selecting the target, in the case of a certain maximum power of the X-ray optical tube, such as 50W, a reasonable combination of high voltage (KV) and current (MA) of the optical tube can achieve the maximum excitation efficiency. Due to point-to-point focusing, X-ray tubes with microfocal spots must be used. Since the characteristic X-ray energy of the target is very low, thin beryllium window X-ray tubes must be used.
GA-116 adopts Ag target 50W micro focal spot thin beryllium window X-ray tube, and reasonable combination of kV and mA.
Scope of application
It is suitable for refineries, testing and certification bodies, tanks, laboratories to measure various oil products from 1ppm to 10% (such as gasoline, diesel, heavy oil, residual fuel oil, etc.), additives, lubricants containing additives, and the measurement of S element in products during refining and chemical processes.
It is also suitable for the measurement of S element in any material in all walks of life
GA-116 ASTM D7039 ASTM D2622 ASTM D4294 High Precision 0.33 PPM WDXRF Sulfur Analyzer X-ray Fluorescence Sulfur Tester Electronic Petroleum Analysis Machine
Peculiarity
Fast and accurate - the measurement time required is very short, generally tens of seconds to give content results. It is highly reproducible and reproducible.
Low detection limit - Using advanced MWDXRF technology, LSDCC core technology, to achieve very low detection limit.
Long-term stability - with variable gain digital multi-channel, PHA automatic adjustment, drift correction, deviation correction and other functions, with excellent long-term stability.
Environmental protection and energy saving - Radiation protection meets exemption requirements. Analysis does not touch the sample does not destroy, no pollution, no chemical reagents, no need to burn.
Easy to use - touch screen operation. The sample is directly loaded into the sample cup, and after placing the instrument, you only need to press the [Start] key to achieve true one-click operation.
High reliability - integrated design, high degree of integration, strong adaptability to the environment, strong anti-interference ability, high reliability.
Cost-effective - No cylinder gas required, very low operating and maintenance costs. The price is half that of similar foreign products. It is a real cost-effective product.
Calibrate
The instrument was calibrated with 7 S-containing samples of known content, and the working curve of Figure 7 was obtained.
FIG. 5. Working curve of S sample
The correlation coefficient γ of the working curve is greater than 0.999, indicating that the linear error of GA-116 sulfur tester is very small.
GA-116 ASTM D7039 ASTM D2622 ASTM D4294 High Precision 0.33 PPM WDXRF Sulfur Analyzer X-ray Fluorescence Sulfur Tester Electronic Petroleum Analysis Machine
Accuracy
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 placed into two different sample cups for the S-accuracy test:
Table 1. Accuracy results of S analysis with five unknown samples
| specimen |
nominal value(ppm) |
Sample cup number one(ppm) |
Sample cup number two(ppm) |
| diesel5 |
5 |
4.81 |
4.99 |
| diesel3 |
3 |
2.93 |
3.05 |
| gasoline2 |
2 |
2.12 |
1.82 |
| gasoline10 |
10 |
10.8 |
9.8 |
| gasoline25 |
25 |
24 |
25.3 |
Table 1 shows the measured concentration results (ppm) and the comparison to the nominal values. These results indicate that at low concentration levels, excellent accuracy of S can be achieved with the GA-116 spectrometer.
Precision
S-repeatability tests were performed on three gasoline samples, each filled with seven different sample cups:
Table 2. Repeatability test data for S gasoline sample S analysis
| Sample cup number |
Sample number one(ppm) |
Sample number two(ppm) |
Sample number three(ppm) |
| 1 |
1.19 |
3.21 |
10.22 |
| 2 |
1.08 |
2.92 |
9.79 |
| 3 |
0.85 |
3.05 |
10.09 |
| 4 |
0.93 |
2.88 |
9.73 |
| 5 |
1.05 |
2.86 |
9.93 |
| 6 |
1.03 |
3.16 |
9.90 |
| 7 |
0.98 |
3.26 |
9.95 |
| average value |
1.02 |
3.05 |
9.93 |
| standard deviation |
0.095 |
0.122 |
0.259 |
| RSD |
9.5% |
4.00% |
2.60% |
Table 2 These results show that excellent repeatability of S can be achieved with the GA-116 sulfur detector at low concentration levels.
Main technical index
| X-ray tube |
voltage:≤50keV,electricity:≤2mA,power≤50W,target materials:Ag |
| detector |
Ultra-thin beryllium window proportional counter |
| LOD(300s) |
0.33ppm |
| measuring range |
1ppm ~ 9.99% |
| up to standard |
GB/T 11140,ISO20884,SH/T 0842,ASTMD2622,D7039,D7220 and so on |
| System analysis time |
1~999s,Recommended value: 300s for micro measurement and 60s for major measurement |
| service conditions |
environment temperature:5~40ºC,relative humidity:≤85%(30ºC),power supply:220V±20V,50Hz,≤200W |
| Measuring atmosphere |
Self-charging system or helium |
| Package Size and weight |
1250mm(W)×690mm(D)×850mm(H),85kg |
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