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DM2500 MMEDXRF Light-Medium Element Spectrometer
Using multiple single-color excitation to achieve a peak backscatter ratio, enabling the measurement of elements (B to Zn).
Its accuracy is comparable to that of large wavelength-dispersive spectrometers.
The standard model is designed for the cement industry.
Or it can be slightly modified and then applied to various industries.
Adaption:
Multi-color single-beam excitation energy dispersive X-ray fluorescence (MMEDXRF) analysis technique
The logarithmic spiral hyperboloid bent crystal (LSDCC) achieves diffraction and serves as a secondary target
High count rate, high resolution, high transmittance (AP3.3 window) SDD detector
A micro-focal thin beryllium window X-ray tube source with a perfect combination of voltage, current and target material
Standard
GB/T176
JB/T11145
JC/T1085
Description:
The DM2500MMEDXRF light and medium element spectrometer, also known as the DM2500 multi-monochromatic excitation energy dispersive X-ray fluorescence light and medium element (B-Zn) spectrometer, is a novel XRF spectrometer developed by our company based on decades of research experience in X-ray fluorescence spectrometry. It is an innovative XRF spectrometer that integrates the company's original DM series X-ray fluorescence sulfur, calcium, iron analysis instruments, X-ray fluorescence multi-element analysis instruments, X-ray fluorescence spectrometers, etc. It adopts the multi-monochromatic excitation energy dispersive X-ray fluorescence (MMEDXRF) (Multiple Monochromatic Excitation Energy Dispersive X-Ray Fluorescence) analysis technology. The main components, such as the monochromatic crystals, use the logarithmic spiral rotating point-to-point focusing germanium monochromatic crystals developed by our company, and the X-ray tubes use the 50W micro-focus large radiation angle thin beryllium window X-ray tubes produced by KeyWay Company, and their high voltage, current, and target materials are optimally combined. The X-ray detectors use the German Ketek company's SDD semiconductor X-ray detectors with high count rate, high energy resolution, and high transmittance at room temperature. Moreover, it adopts the unique technology of the light element-specific optical system and the combination of multiple single-monochromatic excitation systems using our company's independently intellectual property rights. This greatly improves the sensitivity and peak-to-background ratio of the instrument. It also adopts an X-ray downward irradiation system and a sample rotation device, which is particularly suitable for powder pellet samples, and can be selected between vacuum systems or self-inflation systems according to the application. Thus, this spectrometer has reached the international leading level. In comparative tests with large wavelength dispersion spectrometers, most of its performance indicators are close to or reach the performance indicators of large wavelength dispersion spectrometers, and some even exceed them. Its performance indicators are better than those of imported similar products, while the price is only half of that of imported similar products, with an unparalleled price-performance ratio. In addition, the convenience of domestic enterprises' after-sales service is incomparable to that of foreign enterprises. And the spectrometer's excellent shielding protection design ensures no radiation leakage, meeting radiation exemption requirements.
Applications
The standard model of the DM2500MEDXRF light and medium-element spectrometer is specially designed and manufactured for the cement industry, and can be used for the content measurement of cement raw materials, clinker, and other materials. It complies with the relevant requirements of the national standard GB/T 176-2017 "Chemical Analysis Methods for Cement" and the industry standards JC/T1085-2008 "X-ray Fluorescence Analyzer for Cement" and JB/T11145-2011 "X-ray Fluorescence Spectrometer".
The DM2500MEDXRF light-medium element spectrometer is not only used in the cement industry, but also can be applied to the content measurement of all materials in various industries. Although the standard model is specially designed and manufactured for the cement industry, as long as the measurement elements required by the user are within the range of B(5) to Zn(30), the standard model can generally be directly used for measurement in most cases. If your user has special requirements for the measurement of certain elements, our company can modify the monochromatic excitation system and/or software system according to the user's requirements to meet the user's requirements for the measurement elements.
Characteristics
Quick and simultaneous - The required measured elements are analyzed simultaneously at high speed, and the content results are usually available within a few tens of seconds.
High accuracy - Utilizing advanced MMEDXRF technology and LSDCC core technology, the energy of the monochromatic light and the method for generating the monochromatic light are selected based on the element to be measured. This significantly enhances the instrument's sensitivity and peak-to-background ratio, ensuring excellent repeatability and reproducibility, as well as extremely high accuracy.
Downward irradiation - The X-ray downward irradiation system is adopted, which eliminates the possibility of sample powder contamination and damage to the detection system. It is particularly suitable for powder samples such as cement and clinker.
Sample spin - With the sample spin device, the unevenness of the sample caused by the presence of hard substances in the tablet sample and making it difficult to crush is eliminated.
Long-term stability - Utilizing variable gain digital multi-channel, featuring functions such as automatic PHA adjustment, drift correction, and deviation correction, it exhibits excellent long-term stability.
Environmental protection and energy conservation - Radiation protection meets exemption requirements. During analysis, there is no contact or damage to the samples, no pollution occurs, no chemical reagents are needed, and no combustion is required.
Easy to use - touchscreen operation. After placing the sample powder and tablet in the instrument, simply press the [Start] button and it's all done - truly achieving one-button operation.
High reliability - Integrated design, high degree of integration, strong environmental adaptability, strong anti-interference ability, high reliability.
High cost-effectiveness - No need for gas cylinders, and the operating and maintenance costs are extremely low. The price is half that of similar products from abroad. It is a truly cost-effective product.
Advanced technology
Multi-color single-beam excitation energy dispersive X-ray fluorescence (MMEDXRF) analysis technique
One of the main reasons why traditional XRF, especially EDXRF, cannot achieve accurate measurement of ultra-light elements is that the continuous bremsstrahlung scattering in the emission spectrum of the X-ray tube leads to a high continuous scattering background in the X-ray fluorescence spectrum. Moreover, the lower the atomic number of the element, the lower its fluorescence yield. The relatively low fluorescence ray intensity will be drowned in the higher background.
Monochromatic Excitation Beam Energy Dispersive X-Ray Fluorescence (MEXAF) analysis technology involves using optical devices to monochromatize the emission spectrum from an X-ray tube, thereby significantly reducing the continuous scattering background of the fluorescence spectrum. At the same time, it minimally reduces or even possibly increases the intensity of the single-colored lines or narrow energy bands of the required excitation X-rays, thereby greatly enhancing the peak-background ratio of the X-ray fluorescence spectra of the measured elements and enabling accurate measurement of ultra-light elements. The schematic diagram is shown in Figure 1.
The higher the X-ray energy of the excitation sample is from the absorption limit of the required analytical element, the lower the excitation efficiency will be. This limits the single-color excitation spectrometer in that a single color energy excitation source can only measure elements within a certain atomic number range. Since the DM2500 requires the measurement of both light and medium elements, using a single-color energy excitation source will result in very low excitation efficiency for light elements, making it impossible to accurately measure light elements. Therefore, the 2500 adopts two single-color energy excitation sources to excite light elements (below Cl) and medium elements (K-Zn). Thus, it is called multi-color excitation.
A logarithmic spiral rotating hyperbolic surface crystal (LSDCC) with high diffraction efficiency for point-to-point focusing in the measurement of light elements
There are many methods for monochromatizing the emission spectrum of X-ray tubes, including the filter method, the secondary target method, and the diffraction method, etc. Diffraction must satisfy the Bragg law: nλ = 2dsinθ, so it has excellent monochromaticity. And the doubly curved crystals DCC (Doubly Curved Crystals) in the diffraction method can focus the point source, so it has a large collection solid angle and thus has extremely high efficiency. In addition, focusing can also make the light spot on the sample very small, so that the small-area semiconductor detectors Si-PIN or SDD can receive most of the fluorescence rays in the small area of the sample. That is to say, DCC also improves the detection efficiency. Due to the convenient manufacturing of logarithmic spiral LS (Logarithmic Spiral) DCC and the ability to produce a large area, the DM2500 adopts the logarithmic spiral rotating doubly curved crystal LSDCC. The schematic diagram of its point-to-point focusing principle is shown in Figure 2.Germanium secondary target for measuring medium elements
Due to the high fluorescence yield of the central element, the intensity requirement of the excitation radiation is not high. Therefore, we adopted the method of a secondary target to achieve monochromatization of the medium energy. Coincidentally, the LSDCC that can achieve monochromatization of light elements has one of its selectable crystal materials being germanium crystal. The X-ray fluorescence of germanium can excite all elements below Zn. Therefore, the DM2500 uses germanium crystal as the material for LSDCC and also as the secondary target. That is to say, the DM2500 ingeniously uses an optical device to achieve two excitation sources of two different single-color energies produced by these two methods.
The energy spectrum diagram of the excitation source is shown in Figure 3.
Figure 4 shows the XRF spectral diagram of the actual measured cement raw material sample.
High-resolution (123eV), high-count-rate (2 Mcps), and high-transmittance (AP3.3 window) SDD detector
There are many types of X-ray detectors. Among them, the silicon drift detector (SDD) is the best. Its resolution is generally less than 140 eV, which is about 5 times that of wavelength dispersion. Monochromatic excitation can reduce the background by one order of magnitude. Therefore, theoretically, if there is no interference from spectral line overlap, the peak-to-background ratio of monochromatic excitation energy dispersion is better than that of general wavelength dispersion.
The DM2500 is equipped with the VITUS H20LE SDD detector produced by the German KETEK company. Its resolution is less than 129 eV, the effective detection area is 20 mm², the counting rate is 2 Mcps, and the window is AP3.3 polymer. It can measure the B Kα (185 eV) at the lowest level.
A micro-focal, large radiation angle, thin beryllium window X-ray tube with a reasonable combination of kV, mA and target material
To accurately measure light elements, LSDCC only uses the high-intensity characteristic X-rays from the emitted spectrum of the diffraction X-ray tube. These X-rays are emitted by the target material. Reasonable selection of the target material can achieve the highest excitation efficiency. For the standard model DM2500, since the light elements being measured are below Cl, Ag is selected as the target material.
After selecting the target material, under the condition that the maximum power of the X-ray tube is constant (e.g. 50W), a reasonable combination of tube voltage (kV) and current (mA) can achieve the maximum excitation efficiency. Due to the use of point-to-point focusing, a micro-spot, large radiation angle X-ray tube must be adopted. Since the characteristic X-ray energy of the target material is very low, a thin beryllium window X-ray tube must be used.
Technical Parameters
| Measurable Elements | Any element from B(5) to Zn(30) |
| X-Ray Tube | Voltage: ≤50keV Current: ≤2mA Power: ≤50W Target: Ag (Mo, Rh, Pd, Cr, etc. optional) |
| Detector | Type: SDD Effective Area: 20mm² Resolution: ≤123eV Count Rate: ≤2Mcps Window: AP3.3 |
| Measurement Range | 0.01% to 99.99% |
| Measurement Time | 1~999s (Recommended: 180s) |
| Measurement Atmosphere | Self-purging system or Nitrogen gas |
| Operating Conditions | Ambient Temp: 5~40°C Rel. Humidity: ≤85% (@30°C) Power Supply: 220V±20V, 50Hz, ≤200W |
| Dimensions & Weight | 540mm × 500mm × 450mm 35kg |
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