Fully automatic UV fluorescence sulfur analyzer

08.29,20240

Brief Introduction

RPP-9000BThe fully automatic ultraviolet fluorescence sulfur analyzer is a new generation of precision experimental instrument developed based on the principle of ultraviolet fluorescence and the fully automatic vertical sampling method, combined with computer technology. The total sulfur content in the sample was rapidly determined by UV fluorescence method.

Adopting high-precision surface mounted integrated circuits to collect, control, and process data, real-time monitoring and warning of data at various points; Using a mass flow meter to control gas flow and pressure, the gas flow rate is stable, accurate, and without fluctuations.

Adopting a vertical injection method and a 19 position or 156 position turntable automatic injection system, the sample is automatically detected. During the sample testing process, users can add new samples at any time according to their needs, expanding the number of detection bits of the sampler.

It can prompt the operator to troubleshoot in a timely manner, with advantages such as high sensitivity, low noise, wide linear range, strong anti-interference ability, high accuracy of small sample analysis, easy operation, and stable and reliable results. The instrument's cooling fan automatically switches on and off, eliminating the hassle of waiting to shut down after completing the sample.

The instrument can be widely used in petroleum, chemical, power, coal, food, environmental protection and other fields,Determination of total content in crude oil, hydrocarbons, engine fuels, petroleum gas, and petrochemical productssulfurContent.

2、 Basic principles

After the sample is introduced into the high-temperature cracking furnace, it undergoes oxidative cracking, and the sulfides in it are quantitatively converted into sulfur dioxide（SO₂）The reaction gas is carried by the carrier gas and dehydrated by a membrane dryer before entering the reaction chamber. In the reaction chamber, sulfur dioxide is converted into an excited state of sulfur dioxide after being irradiated with ultraviolet light of a specific wavelength（S0₂^*）When S0₂^*When transitioning to the ground state, photons are emitted, and the photoelectron signal is received by a photomultiplier tube, amplified by an amplifier, and processed by a computer to be converted into an electrical signal proportional to the intensity of light

Under certain conditions, the fluorescence intensity generated in the reaction is proportional to the amount of sulfur dioxide produced, and the amount of sulfur dioxide is proportional to the total sulfur content in the sample. Therefore, the total sulfur content in the sample can be determined by measuring the fluorescence intensity. Before analyzing the sample, use a standard sample that is close to the sample to create a calibration curve. Then, analyze the sample under the same conditions. The program automatically calculates the sulfur content of the sample based on the calibration curve of the standard sample.

3、 Technical parameters

serial number	project	Instrument technical specifications
1	detection method	The ultraviolet fluorescence method uses a pulsed scintillation xenon lamp as the excitation light source for the ultraviolet lamp.
2	Applicable method	SH/T 0689、GB/T 34100TheGB/T 11141、GB/T 11060.8、ASTM D5453、ASTM D6667、SH/T 1820 等
3	analyze samples	forDetermination of total sulfur content in petrochemical products such as crude oil, distillate oil, petroleum gas, coal, naphtha raw materials, and pre hydrogenation raw materialsanalyze
4	Measurable sample status	Liquid, gas
5	injection volume	Liquid: 2-50ul Gas: 2～20ml
6	measurement range	0.01mg/L~10000mg/L~percentage content
7	minimum detectable concentration	0.01mg/L
8	Temperature control range and accuracy:	0℃～1300℃，±1℃
9	measurement accuracy (Continuous sampling6time)	0.1mg/LStandard sample: RSD ≤ 12%; 0.2mg/LStandard sample: RSD ≤ 10%; 1mg/LStandard sample: RSD ≤ 8%; 5mg/LStandard sample: RSD ≤ 6%; 10mg/LStandard sample: RSD ≤ 4%.
10	Negative high voltage	DC400V1200V can be set to the desired value based on the measured concentration
11	Baseline drift	Not exceeding 5mv/min
12	Gas source requirements	Oxygen purity 99.75%，Output pressure ≤ 0.2MPa； Argon purity 99.998%，Output pressure ≤ 0.2MPa；
13	analysis time	2～4min
14	Data communication interface	RS232, canLimitsData transmission between systems
15	Weight, kg	60
16	size mm	Instrument host: length x width x height: 600 x 500 x 520 (mm) Automatic sampler: length x width x height: 360 x 340 x 460 (mm)

4、 Performance characteristics

serial number	project	Performance Characteristics
1	key component	Flashing xenon lamp, power supply, photomultiplier tube, monochromator, membrane dryerMicrosamplerAll key components are imported devices to ensure the accuracy of instrument detection and service life.
2	Blind sleeve typequartz tube	Blind sleeve quartz tube ensures sufficient combustion of the sample through back and forth combustion, without the need for tungsten trioxide as a catalyst, which can also improve the conversion efficiency of the sample and avoid carbon deposition.
3	Gas flow control	Using a mass flow meter and computer-controlled gas flow rate, the gas flow rate is stable, accurate, and without fluctuations. The instrument has better repeatability and higher measurement accuracy for small content samples. At the same time, the mass flow meter detects abnormal flow of carrier gas or auxiliary gas, and the workstation suspends the injection of oil samples to prevent carbon deposition and contamination of the gas path and detector due to sample oxygen deficiency cracking.
4	Gas stabilization system	Invention: Sample Cracking Stable Pressure Device 201210257581.8 The installation of a pressure stabilization system in the gas circuit avoids interference from gas flow and pressure fluctuations on the measurement.
5	Temperature control system	Automatic control device for cracking furnace fan, automatic on/off of cooling fan, no need for personnel to wait for shutdown. It has the function of warning errors during operation and prohibiting sample injection due to errors, and has the function of automatic power-off protection against overheating.
6	Testing Room	Adopting the latest foreign processes and technologies to ensure the airtightness of each component, no air leakage, no light leakage, and minimal external interference. Adopting imported coating materials and advanced spraying technology to ensure lower background noise in the detection room, improve instrument sensitivity and detection limit.
7	drying system	Imported membrane dryer is used for dehydration, which does not require frequent replacement and has stable performance.
8	cracking furnace	Using imported electric furnace wire to improve the service life of the cracking furnace.
Injection system
1	Fully automatic sampling system	Using 19 digitsor156bitFully automatic sample injection system, computer-controlled,Direct injection,The experimental process is fully automated, with automatic sample replacement, automatic cleaning, automatic elimination of errors caused by bubbles using the volume difference method, and automatic drawing of standard curves. The injection speed is constant and can be adjusted according to the sample. Sample injector on computerEnd to endSettings, no need for users to individually set up the injector. User initiated detection allows for unmanned operation, reducing the workload for operatorsandThe system detection error caused by human injection error has improved work efficiencyAnd detection accuracy. During the testing process, parameters such as the number of tests, injection volume, and analysis time of the test sample can be modified at any time, with functions such as sample addition, replacement, and priority testing.
2	Vertical injection	Fully automatic injection adopts vertical combustion analysis mode; Ensure the conversion of sulfur and the production of SO after combustion₂Directly enter the UV fluorescence sulfur detector for detection.
3	Air path blowing	Rinse the pipeline with carrier gas and sample gas to eliminate interference from switching detection between different samples.
4	syringe	Adopting a replaceable needle type injection needle with a needle length of ≥ 7cm to ensure that the sample burns fully at the optimal combustion position and avoid carbon deposition.
5	silicone pad	Imported silicone pads are used, with a single silicone pad injection frequency of ≥ 300 needles, reducing the frequency of silicone pad replacement and improving the detection efficiency of the instrument.
Workstation system
1	standard curve	The segmented standard curve can be integrated into one standard curve (such as 0.2-0.5-1.0-5-10-50-100-... mg/L), and the instrument automatically retrieves the appropriate standard curve for sampling based on the sample content size, without the need for manual operation by personnel. The workstation has the function of identifying the working status and parameters of standard curves, and promptly correcting deviations caused by the attenuation of ultraviolet excitation light sources and the decrease in detector performance.
2	Curve correction	Combining single point correction and multi-point correction to automatically generate correction curves. The workstation provides users with a multi-point high-order curve fitting method, reducing the deviation caused by the linear correlation of the fitting curve in the detection results of low content samples, making the results closer to the true value.
3	auto-correction	During the sample testing process, the workstation can automatically correct the system curve deviation based on the standard sample testing results.
4	monitoring system	Workstation monitors instrument status in real-time, including gas flow rate, furnace temperature, baseline, and other conditions,When an abnormality occurs, the instrument automatically cools down and enters a protective state to ensure laboratory safety.
5	Sleep wake-up function	The sleep function can set the combustion furnace temperature, gas flow rate, etc. After completing the analysis, the instrument automatically enters the sleep state and runs in a low-power state. The wake-up function can wake up at any set time, allowing the instrument to complete self inspection and enter working mode without the operator being present on site.
6	data processing	The analysis process and data processing process are controlled by computers, which are easy to operate,Equipped with a data processing system，It has automatic calculation functions such as concentration, content, unit conversion, RSD, etc. Equipped with self checking function, if there is any abnormal data in a certain area, the workstation will issue an alarm and display text prompts on the screen
7	The data shows	Screen display parameters, measurement peak shape, andexperimentresult. Can be queried, stored, and printedspectrogramandThe experimental results can be edited using EXCEL. The data output provides XML data format files,Can meet the compatibility requirements of LIMS system.
8	operating platform	WindowsfuckAs a platform,It has human-machine dialogue function, and the analysis process and data processing process are controlled by a computer, making it easy to operate.
9	Result printing	Can print test data and final analysis report,

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