Ultraviolet fluorecence sulfur analyzer
SPECTROSCAN UFS is for determination of the mass fraction of sulfur in liquid homogeneous oil products such as diesel fuel, gasoline, kerosine and any distillate oil products in accordance to ASTM D 5453-09 and also for testing the automotive fuel of 3rd, 4th and 5th class in terms of mass fraction of sulfur, in accordance with the technical regulations "On requirements for automobile and aviation gasoline, diesel and marine fuel, jet fuel and fuel oil."
The principle of the analyzer is based on the method of ultraviolet fluorescence.
The test sample is injected into the combustion chamber where at a temperature of 1000-1100 ° C in an oxygen-rich atmosphere, the sulfur presented in the sample is oxidized to sulfur dioxide. The combustion chamber is connected by a gas main to a measuring block where the formed gases are exposed to UV light. Sulfur dioxide, presented in gases, absorbing the energy of UV light, is converted into excited sulfur dioxide. Fluorescence emitted from excited sulfur dioxide when it is converted to a stable state is detected by the photomultiplier and the detected signal is proportional to the mass fraction of sulfur in the sample.
The mass fraction of sulfur is calculated by the previously constructed calibration characteristics, which is the dependence of the mass fraction of sulfur on the measured intensities of the fluorescence signal, in accordance with measurement methods (techniques).
Structurally, the analyzer consists of two blocks - the furnace block and the measuring unit.
The furnace block serves to decompose the injected sample. The test sample is injected with a microliter syringe directly into the combustion chamber - a quartz tube to which gases are supplied - argon and oxygen. In the combustion chamber at a temperature of 1000-1100 ° C, the sample material burns, forming mainly gases: CO2, SO2 and water vapor. Water vapor is effectively removed by a membrane dehumidifier. The combustion chamber is connected by a gas main to a measuring block.
The measuring unit includes: a flow measuring cell, a source of ultraviolet radiation - a deuterium lamp, a fluorescent radiation receiver - a photomultiplier, an electronic system for amplification and signal processing.
Temperature control and monitoring of gas flows are carried out in manual mode using the built-in keyboard and rotameters of the furnace block. The sample is fed manually or semi-automatically using an input device that provides a sample at a controlled and constant speed.
dauly during 8 hours of operating
~40 days/bottle 40 litres– Ar
Since the sample injected into the analyzer is completely burned with the formation of gaseous products, the method is practically not subject to matrix influences and allows to determine sulfur in a wide variety of samples.
In the analyzer, the "Waiting" mode is implemented which allows the analyzer to be maintained in the "warmed-up" state for accelerated output to the operating mode, while maintaining the proper state of all elements of the gas system.
- Weak influence of the matrix on the results of measurements - only halides> 0.35%, there is no influence both of the C-H ratio and of various additives added to the fuel;
- Simplicity of design, absence of mechanical moving parts inside the device, which favorably affects the reliability of the device;
- Wide range of measurements: 1.0 - 100000 ppm;
- Linear calibration curve: minimum correlation coefficient R = 0.995; 4 points are enough;
- Ability to work on a one-point graduation;
- Simple user service of the device;
- The input device allows the sample to be injected at a controlled and constant speed;
- The delivery includes metrological verification, software for quantitative analysis, as well as consumables and accessories necessary for analysis;
1 year warranty.
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