I. Working Principle and Purposes
The ND-QP980T full-spectrum direct reading spectrometer is composed of four parts: the excitation module, the optical system, the measurement and control system, and the analysis software. When the instrument is working, under the protection of the vacuum environment, the high-voltage discharge generated by the excitation light source transfers energy to the metal material, changing the metal material from a solid state to a gaseous state. The outer electrons of the atoms in the metal vapor jump from the ground state to the excited state. Atoms in the excited state are unstable. When the outer electrons return from the excited state to the ground state, energy is emitted in the form of light. Different elements emit light of different wavelengths. The full-spectrum curve is collected through the optical path system and the CMOS detector. The spectrum is analyzed by the analysis software. The existence of a certain element is confirmed according to the wavelength of the light, and the content of this element is determined according to the intensity of this wavelength.
The ND-QP980T full-spectrum direct reading spectrometer is mainly used to measure the alloy element composition and impurity element content in metal materials. It is widely used in on-furnace detection, incoming material inspection, quality control, and factory inspection in industries such as metallurgy, casting, and machining.
The measurement accuracy of the ND-QP980T full-spectrum direct reading spectrometer is much higher than the national standard. Since it was launched in the market, it has accumulated rich application experience and has been recognized by many well-known customers.
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Main Technical Parameters
? Optical Structure: The ND-QP980T adopts the Paschen-Runge structure and the Rowland circle device to reduce the influence of stress release caused by the change of environmental temperature and vacuum degree on the instrument and improve the accuracy and stability of the instrument.
? Optical Focal Length: The grating radius is 400mm. The longer focal length provides excellent resolution for the instrument.
? Spectral Line Range: The detectable wavelength range is (140 - 680) nm. It can analyze metal and non-metal elements and meet the requirements of each matrix material for testing elements.
? Entrance Slit: The slit width is 12μm. The fine entrance slit effectively filters out unnecessary stray light, avoids the detector receiving light that is too saturated, and reduces the light intensity interference value between elements.
? Detector: The CMOS detector is used. Multiple CMOS are installed and arranged in a dislocation up and down. There is no gap between different wavelengths, making the spectral wavelength a whole and achieving full-spectrum coverage to meet the customer's demand for multi-element testing.
? Concave Grating: 2400gr/mm, the reciprocal of the dispersion rate: 0.47nm/mm (first order). The concave grating can reduce the absorption phenomenon. There is only the light loss of one reflection on the grating surface, and there is no chromatic aberration, improving the vacuum ultraviolet spectrum effect.
? Analysis Time: It varies according to the type of sample. Generally, the analysis time is less than 40 seconds each time.
? Excitation Light Source: The digital excitation light source, with various excitation conditions adjustable, meets the analysis requirements of different materials.
? Excitation Electrode: The high-purity tungsten electrode is used. The high-purity tungsten electrode has the advantages of high strength, corrosion resistance, and high temperature oxidation resistance, reducing the influence of instrument parameters on test data during the use of the instrument.
? Argon Module: The argon purity is required to be 99.999%. The argon inlet pressure is 0.5MPa. The argon flow rate is about 3.5L/min for excitation, about 0.4L/min for maintenance, and about 0.1L/min for standby.
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Main Technical Characteristics
High-performance Optical System
The arc flame generated during the excitation of the optical system is directly introduced into the vacuum optical chamber through a lens, realizing a direct optical path and effectively reducing the optical path loss.
The high-precision CMOS element can accurately determine the content of non-metal elements and various metal elements.
The measurement results are accurate, with excellent repeatability and long-term stability.
Automatic Optical Path Calibration
Automatic optical path calibration. The optical system automatically scans the spectral lines to ensure the correctness of reception, eliminating the cumbersome work of peak scanning.
The instrument automatically recognizes specific spectral lines and compares them with the original stored lines to determine the drift position and find the current pixel position of the analysis line for measurement.
Plug-in Lens Design
The vacuum optical system adopts a unique incident window and is isolated from the vacuum. It can be operated when the vacuum system is working. The optical lens adopts a plug-in lens structure, which is convenient and fast for daily cleaning and maintenance.
Integration of the Vacuum Chamber
The unique optical chamber structure design makes the vacuum chamber volume smaller, and the vacuum pumping time is only 1/2 of that of an ordinary spectrometer.
The integrated design of the vacuum chamber and high-precision processing make the vacuum more durable.
Vacuum Anti-oil Return Technology
The multi-level isolated vacuum anti-oil return technology uses a vacuum differential pressure valve to ensure that the vacuum optical chamber is completely isolated from the vacuum when the vacuum pump is not working.
A vacuum oil filter device is added in the middle to ensure that the oil in the vacuum pump does not enter the vacuum chamber and ensure that the CMOS detector and optical elements work in a reliable environment.
Open Excitation Table
The open excitation table and the flexible sample holder design can meet the analysis of various shapes and sizes of samples on the customer's site.
When used with a small sample holder, the minimum analysis of wire materials can reach 3mm.
Jet Electrode Technology
The international most advanced jet electrode technology is adopted. The tungsten material electrode is used. An argon jet airflow will be formed around the electrode in the excited state. In this way, the excitation point will not be in contact with the outside air during the excitation process, improving the excitation accuracy.
With the unique argon gas path design, the argon consumption is greatly reduced, and the customer's use cost is also reduced.
Integrated Gas Path Module
The gas path system adopts the maintenance-free design of the gas path module, replacing the solenoid valve and flowmeter. The electrode self-purge function creates a good environment for excitation.
Digital Excitation Light Source
The digital excitation light source adopts the most advanced international plasma excitation light source, and the ultra-stable energy is released to excite the sample in the argon environment.
The all-digital excitation pulse ensures the ultra-high resolution and high stability rate output of the plasma of the excited sample.
Various parameters of the light source can be adjusted arbitrarily to meet the excitation requirements of different materials.
High-speed Data Acquisition
The instrument uses a high-performance CMOS detection element, which has the function of ultra-high-speed data acquisition and analysis for each CMOS separately, and can automatically and real-time monitor and control the operating status of modules such as the optical chamber temperature, vacuum degree, argon pressure, light source, and excitation chamber.
Ethernet Data Transmission
The Ethernet card and TCP/IP protocol are used between the computer and the spectrometer to avoid the disadvantages of electromagnetic interference and fiber aging. At the same time, the computer and printer are completely external, which is convenient for upgrading and replacement.
The instrument status can be remotely monitored, and the multi-channel control system controls and monitors all instrument parameters.
Pre-fabricated Working Curve
There is a standard sample library of different materials and grades. The factory pre-fabricates the working curve when the instrument leaves the factory, which is convenient for installation, debugging, and timely putting into production.
According to the analysis program corresponding to the element and material, there is a slight difference. The excitation and test parameters have been adjusted when the instrument leaves the factory, and the optimal test conditions can be automatically selected according to the analysis program.
The technical specifications are accompanied by the analysis range (and the working curve can be drawn or extended for free according to the standard samples provided by the user).
Fast Analysis Speed
The analysis speed is fast, and an analysis can be completed in only 20 seconds.
For different analysis materials, by setting the pre-ignition time and measurement time, the instrument can achieve the optimal analysis effect in the shortest time.
Multi-matrix Analysis
The optical path design adopts the Rowland circle structure, and the detectors are arranged alternately up and down to ensure that all spectral lines are received. Without adding hardware facilities, multi-matrix analysis can be realized.
It is convenient to add the matrix and material types and analysis elements according to the production needs (without hardware cost).
Software in Chinese and English System
The instrument operation software is fully compatible with the Windows 7/8/10 system.
The software is easy to operate. Even personnel without any knowledge and operation experience of the spectrometer can start to use it only after simple knowledge training.
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Laboratory Environment Requirements
? Environmental Requirements
? The instrument must be placed in a dedicated laboratory. The indoor area is greater than 10 square meters, and it is ensured that there are no harmful, flammable, and corrosive gases around. Note: It is prohibited to place this instrument in a chemical analysis laboratory.
? Working temperature: 10°C - 30°C. The room temperature fluctuation is less than 2°C within 3 hours. It is required to install an air conditioner in the laboratory.
? Storage temperature: 0°C - 45°C
? Relative environmental humidity: 20% - 80%. For humid areas, a dehumidifier needs to be equipped.
? The spectroscopic chamber of the direct reading spectrometer is installed in a box with a temperature control device and can work normally within the above environmental range. If it exceeds the above requirements, the service life and measurement accuracy of the instrument will be affected.
? Power Supply Requirements
? Power supply: Single-phase 220±20V, 1KVA power supply.
? To ensure the normal use of the direct reading spectrometer, please equip the instrument with a 1kVA - 3kVA single-phase 220V AC parameter voltage regulator.
? The direct reading spectrometer uses a single-phase power supply with protective grounding. To ensure the reliable use of the instrument, the user must ensure that the PE protective ground of the power grid is well grounded and separated from the protective ground of other large equipment. If the user cannot ensure that the PE is well grounded, please prepare a separate ground wire for the instrument, and the grounding resistance is required to be less than 4 ohms.
Argon Requirements:
? The argon purity is ≥99.999%, the oxygen content is ≤2ppm, and the H2O content is ≤5ppm. (The argon cylinder cannot be stored outdoors and is strictly prohibited from being exposed to rain). If there is no high-purity argon, it is recommended to use an argon purifier.
? Argon usage flow rate: The standby flow rate is about 0.1L/min, the maintenance flow rate is about (0.4 - 0.5)L/min, and the excitation flow rate is about 3.5L/min.
? Argon control pressure: 0.5Mpa.
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Argon Connecting Pipe
? The special argon stainless steel pipe provided randomly must be used for connection.
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Exhaust Bottle
? The exhaust gas discharged by the instrument is discharged into the filter bottle provided randomly through a PVC reinforced pipe with an inner diameter of 14mm. It needs to be cleaned and replaced in time to prevent poor ventilation.
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Sample Preparation
? For iron-based samples, a special sample grinding machine must be used to prepare samples. A double-disc grinding machine and a floor-standing grinder are used to grind the surface of steel samples.
? The user needs to prepare a cutting machine for processing samples that are not suitable for the spectrometer analysis in terms of shape.
? The analyzed sample must be uniform, without pores and casting defects. The preparation must achieve a smooth surface, no oxide layer, no oil stain, and no burr on the sample edge.
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Standard Sample Requirements
? When the direct reading spectrometer leaves the factory, a spectral correction standard sample will be randomly included, which is used to correct the overall spectral drift of the instrument. In addition, the user needs to prepare standard samples or internal control samples suitable for their product types for the correction...
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