Carbon Sulfur Analyzer
What is carbon sulfur analyzer?
Carbon sulfur analyzer is an intelligent infrared analysis and measurement instrument with a pyroelectric sensor as the core, consisting of a high-frequency induction combustion furnace and computer. The analysis software is based on Windows operating platform, with a standard operating interface and humanized human-computer interaction function. It is mainly used for the analysis of carbon and sulfur element content in ferrous metals, non-ferrous metals, rare earth metals, inorganic substances, ores, ceramics, and other substances in metallurgy, machinery, commodity inspection, scientific research and chemical industry. The carbon and sulfur element analyzer is composed of electronic balance, analyzer host, computer, printer and other parts.
Carbon and sulfur analyzer can determine the content of carbon, sulfur, manganese, phosphorus, silicon, nickel, chromium, molybdenum, copper, titanium, zinc, vanadium, magnesium and rare earth elements in cast iron, ductile iron, pig iron, stainless steel, plain carbon steel, alloy steel, alloy cast iron, various ores and non-ferrous metals.
Carbon sulfur analyzer principle
The carrier gas (oxygen) is purified and introduced into the combustion furnace (resistance furnace or high-frequency furnace), where the sample is oxidized by oxygen at a high temperature in the combustion furnace, causing the oxidation of carbon and sulfur in the sample to CO2, CO and SO2, and the resulting oxides are loaded by oxygen into the sulfur detection cell for sulfur determination through the dust and water removal purification device. Thereafter, a mixture of gases containing CO2, CO, SO2 and O2 enters the heated catalyst furnace together, where it undergoes a catalytic conversion of CO → CO2 and SO2 → SO3. This gas mixture enters the desulfurization reagent tube and is introduced into the carbon detection cell for carbon determination. The residual gas is discharged to the outside by the analyzer. At the same time, the carbon and sulfur results are displayed in %C and %S on the LCD screen of the main unit and the connected computer monitor and stored in the computer for ready access.
In short, the carbon and sulfur analyzer works by combusting the specimen with oxygen in a high-temperature furnace (such as a resistance furnace also called tube furnace, electric arc furnace, high-frequency induction combustion furnace, etc.), generating and escaping CO2 and SO2 gas.
Feature of carbon sulfur analyzer
a. Adopt gas volume method differential pressure type carbon fixing. The results are detected by a high-sensitivity barometric pressure sensor. The single-chip computer automatically carries out data processing, realizing the automation of carbon reading.
b. Automatic titration of sulfur determination by iodometric method, which excludes human error and realizes direct reading of analysis results by digital display.
c. Electronic balance inline weighing of indeterminate amounts of samples. The single-chip computer automatically reads in the weight or manually keyed in optional, which improves the analysis speed.
d. Sulfur titration liquid addition without electrode control patent technology, which reduces the failure rate.
e. The use of isolated touch keys eliminates interference and reduces the failure rate, making it easy to operate and novel in structure.
Type of carbon sulfur analyzer
Typically, carbon and sulfur analyzer is the general term for instruments that quantitatively analyze the carbon and sulfur elements in steel materials. There are several types of carbon and sulfur analyzers according to the analysis methods and principles as follows.
| Analysis method | Analysis method | Description |
|---|---|---|
| Infrared absorption method carbon and sulfur analyzer | High-frequency infrared carbon and sulfur analyzer | Infrared photometry refers to the oxidation of carbon and sulfur in the specimen to carbon dioxide and sulfur dioxide gas after high-temperature heating under oxygen-rich conditions. The gas is processed into the corresponding absorption cell, absorption of the corresponding infrared radiation, forwarded by the detector as a signal, and the computer processing output results. This method has the characteristics of accuracy, rapidity and high sensitivity, and can be applied to both high and low carbon and sulfur content. The infrared carbon and sulfur analyzer using this method have a higher degree of automation and higher price, which is suitable for occasions requiring higher analysis accuracy. |
| Electric arc infrared carbon and sulfur analyzer | ||
| Tube infrared carbon and sulphur analyzer | ||
| Gas volumetric method / iodometric method of carbon and sulfur analyzer | High-speed carbon and sulfur analyzer | Among the volumetric methods, the measurement of carbon is a gas volumetric method and non-aqueous titration method, while the measurement of sulfur is the iodine amount method and the acid-base titration method. Gas volumetric method for carbon measurement and iodine quantification for sulfur, both fast and accurate, are commonly used methods for the joint determination of carbon and sulfur. The carbon and sulfur analyzer using this method has high accuracy with a lower limit of 0.050% for carbon and 0.005% for sulfur, which can meet the needs of most occasions. |
| Gas volumetric method carbon and sulfur analyzer | ||
| Others | Non-aqueous titrimetric carbon and sulfur analyzer | The weight method is commonly used in the absorption of carbon dioxide by alkali asbestos, from the "increment" to find out the carbon content. Determination of sulfur commonly used wet method refers to the sample with acid decomposition oxidation into sulfate, and then add barium chloride in the hydrochloric acid medium to produce barium sulfate, after precipitation, filtration, washing, burning, and other procedures weighed to calculate the content of sulfur. The disadvantage of the weight method is that the analysis speed is slow, so it is impossible to be used for on-site carbon and sulfur analysis in enterprises; the advantage is that it has high accuracy and is still recommended as a standard method at home and abroad for standard laboratories and research institutions. |
| Electrical conductivity method carbon and sulfur analyzer | The determination of carbon and sulfur by conductivity method is characterized by accuracy, rapidity and sensitivity, with the disadvantage of narrow measurement range and high reagent consumption. |
Use of carbon sulfur analyzer
a. The electric arc furnace in the carbon and sulfur analyzer requires the use of high purity oxygen to fuel the combustion. The use of oxygen must be by the safety procedures for the use of oxygen operations.
b. If the carbon and sulfur analyzer is used in the carbon and sulfur test, the test is first sulfur dioxide absorption, and then carbon dioxide absorption. When titration, carbon should be fixed first, the upper part of the absorption cup should be kept blue to prevent running carbon, and then fix sulfur after the carbon is fixed to the endpoint. If the operator observes the sulfur set to near the endpoint, waiting for a while, and then slowly setting to the endpoint, otherwise it is easy to overdose.
c. Carbon and sulfur analyzer equipment should be placed away from acid, alkaline and other corrosive gases to avoid dust and vibration interference with other instruments in the laboratory.
d. Laboratory temperature is generally 10 degrees to 30 degrees, and humidity is less than 75%.
e. After the analysis of the specimen, the sulfur absorption solution should be partially released and the absorption solution should be added to the original volume again to prevent the carbon absorption solution from sucking back. If there is a back absorption phenomenon, the operator must rinse the container clean with distilled water, otherwise, in the next measurement, the residual liquid will make errors in the results of sulfur and low values.
f. The instrument needs to be shut down according to the prescribed procedure. If the power is turned off directly, it may cause data loss and irreparable damage.
Cautions of carbon sulfur analyzer
a. Be sure to close the arc combustion furnace body before analysis, otherwise it is easy to burn the instrument.
b. After pressing the preparation, if the measuring cylinder and burette do not need to add liquid, pull out the electrodes of both and wipe them dry.
c. Oxygen pressure reducing valve should be controlled at about 0.04, and the flow meter of the electric arc combustion furnace should be controlled between 80~120.
Common faults and solutions of carbon sulfur analyzer
Fault: Infrared carbon and sulfur analyzer smoke at the fan of the high-frequency furnace
Solution
First is the gas circuit diagnosis. At this time, the furnace head pressure is below 0.08Mpa and the combustion pressure is below 0.15Mpa, while the analysis gas flow is almost zero and the adjustment knob is ineffective. Then, open the stove head. If the quartz tube is broken, replace it with a new one. If the diagnostic gas circuit is normal, the operator needs to adjust the needle valve to make the analysis gas flow to the normal value of 3-4 (l/min), adjust the calibrator 2 to make the furnace head pressure reach 0.08Mpa and adjust the calibrator 1 to make the combustion pressure reach 0.15Mpa. A final diagnosis of all normal is sufficient for normal analysis.
Fault: Automatic sweeping device not working
Solution
If the display is normal after checking the air circuit, you need to check if the purge cylinder is stuck. If the cylinder shows normal, you need to check whether the cylinder control solenoid valve and control signal receiving board both show normal. Normally, the solenoid valve is voltage free, because it only has voltage when the switch is on to prompt the solenoid valve to turn on and work. If the voltage measurement shows that it does not work when the auto-purge command is applied in the software, and after checking the position of the cylinder limit switch, it is found that the auto-purge does not work due to poor position, then it can be adjusted to return to normal.
Fault: High-frequency furnace not working
Solution
If the gas circuit shows normal but the HF furnace is not working, it is recommended to check the main fuse behind the HF first. If the main fuse is blown then you need to replace it with a new one and put it into use.
If the same phenomenon appears again after a period of observation and no obvious fault is checked, it is necessary to put on new insurance again and observe the power on, and then do less than three or four samples.
Fault: Anomalies in the sulfur curve, which seriously affect the analysis of sulfur elements
Solution
When this situation occurs, the furnace head needs to be thoroughly cleaned. Replace the aging sulfur detector transistor, replace the C and S control board voltage adjustment potentiometer and the sampler loose input interface to replace off, so that the sulfur curve is normal. At this point, in addition to ferrosilicon sulfur cannot be analyzed, the rest of the specimen can be analyzed. If the silicon-iron sulfur curve is not improved after replacing the sampler patch A/D board, re-grounding the ground wire, and welding the ground wire of the A/D board and USB ground wire, it is necessary to replace the new filter again to make the silicon-iron sulfur is greatly improved. Then, through the C, S preamp gain and frequency adjustment, the sulfur curve is normal. The instrument can be used for ferrosilicon sulfur analysis.
How to buy carbon sulfur analyzer?
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