CS-2000 Carbon / Sulfur Determin

CS-2000 Carbon / Sulfur Determinator		WHY CS-2000?? 1000 ANALYSIS WITHOUT MAINTENANCE

Overview
The CS-2000 automatic analyser incorporates the latest in combustion technology. It is designed for the rapid simultaneous determination of carbon and sulfur in steel, cast iron, copper, alloys, ores, cement, ceramics, carbides, minerals, coal, coke, oil, ashes, catalysts, lime, gypsum, soils, rubber, leaves, soot, tobacco, waste, sand, glass, etc. The CS-2000 can be supplied with up to four independent infrared cells. The sensitivities of the cells resp. the IR-absorbtion lengths can be individually selected to offer optimum precision for the analysis of high and low levels of both, sulfur and carbon. The CS-2000 features a microcontroller, a high temperature resistance furnace up to 1550°C, an induction furnace and solid state infrared detectors with auto zero and auto range control. Separate cabinets eliminate any influence of temperature between the resistance furnace and the analytical unit. This modular design gives the user flexibility to position the resistance furnace to the left or right of the analyzer and also allows the installation of a TIC-module between the two. The modular design makes servicing much easier compared to single cabinet analyzers.

Operating technique

Samples are accurately weighed in the ceramic crucible on the interfaced electronic balance. By pressing a key, the sample weight is automatically transfered to the PC. If required, sample weights can also be entered manually. By pressing the start key the analysis cycle begins and the sample enters the furnace. Depending on sample weight and material analysed, the typical analysis time is 50 seconds for induction furnace operation and 60 to 120 seconds for resistance furnace operation. During the analysis cycle instructions are displayed to ensure easy and reliable performance. The CS-2000 requires minimal maintenance for which access is simple.

PC control with Windows 2000/XP software
Comprehensive analyser control and easy operation are provided by the software running on PC, connected to the analyser.

Infrared Cells
		The infrared cells of the CS-2000 do not require any manual zero adjustments. The zero and sensitivity adjustments of the infrared cells are permanently and automatically controlled by the electronics. The detectors utilize solid state sensors combined with infrared filters. The sensors are not gas filled, thus eliminating long term problems due to gas leakage. The CS-2000 can be equipped with up to four independent infrared cells. The lengths of all four cells can be individually optimized, to obtain maximum precision for the target analysis levels of each customer. Each of the cells can be installed with infrared absorption lengths ranging between 1mm and 320mm.

Resistance Furnace up to 1550°C

The resistance furnace employs Silicon carbide heating elements. Full electronic control includes current limitation during cold-start conditions to promote long element life. A separate sensor is used to monitor ambient temperature and provide data for automatic reference point compensation ensuring that furnace temperature is not affected by fluctuations of ambient temperature. The furnace requires approximately 10 to 15 minutes to reach operating temperature.

Combustion efficiency
The design of the resistance furnace boat stop ensures oxygen carrier gas penetrates into the crucible, ensuring efficient combustion. This design eliminates the need for fragile lances and honeycomb boat stops which tend to block easily with ash. Additionally the boat stop protects the combustion tube from the aggressive combustion products, thus extending the life of the tube. The combustion tube is a simple straight ceramic tube that is robust and inexpensive to replace. The life expectancy of the tube is measured in thousands of analyses and not hundreds as is the case with other analysers. (Protected by German utility model)
A variety of combustion boats can be used in the furnace, including the reusable ceramic boats (L=57 mm, W=22mm, H=13 mm). Porcelain or quartz boats are also an option.

Automatic induction furnace cleaning
Users of carbon and sulfur analyzers with Induction furnaces know that dust accumulates during combustion and forms deposits (mainly of iron and tungsten oxides) in the combustion chamber. The CS-2000 furnace is cleaned automatically after each analysis, thus ensuring repeatable and accurate results without the time consuming and unpleasant task of manual furnace cleaning. The standard cleaning apparatus is mechanically attached to the furnace open/close system, thus ensuring it is not possible for the cleaning brush to collide with a hot crucible.
The cleaning brushes won't burn!
The efficient design of the cleaning mechanism rules out any possibility of the cleaning brush catching fire. To confirm this fact, ELTRA offers free replacement of each burned cleaning brush, during the entire working life of the analyzer.
The induction furnace and the autoloader use standard ceramic crucibles, which are 1” or 25 mm in diameter.

Fractional analysis
Due to the fact that free carbon and sulfur burn at lower temperatures than carbides and sulfates, the CS-2000 can separate and measure free carbon, free sulfur and carbides and sulfates. After inserting the sample in the combustion boat into the resistance furnace, the boat gradually heats up. The free carbon and sulfur within the sample burn first, while carbides and sulfides burn several seconds later. The peak separation software integrates the individual peaks and then displays the results at the end of the combustion.		$Screenshot fractional analysis$

Electronic Flow Controller

An essential part of the gas flow system is the electronic flow controller. This provides a stable gas flow by eliminating the known disadvantages of mechanical controllers.

Up to 20 grams of copper sample without accelerators

The unique design of the induction furnace combined with intelligent power control electronics enables the analysis of copper samples up to a weight of 20 grams without the need of any accelerators. This is very important in case of samples with extremely low C and S contents, like copper and copper alloys. The higher the weight, the higher the amount of C and S present. The elimination of the need for an accelerator is a breakthrough in the analysis of very low C and S. The use of accelerators can badly affect the results when the very low C and S in the sample is similar to the C and S content of the accelerators (blanks). The CS-2000 eliminates this problem.

Carrier gas conservation

If an analysis has not been carried our for a period oft time, the analyzer will automatically switch to "gas conservation mode.” This effectively means the carrier gas flow rate is reduced to a minimum, only allowing a small amount of oxygen to circulate through the IR cells etc. The period of time before the gas conservation is activated, can be modified via the PC software. It is also possible to have carrier gas flow only during combustion. As soon as the next sample is analyzed, the carrier gas returns to normal flow rate.

TIC-module
Due to the modular design of the CS-2000, a module for total inorganic carbon (TIC) can be placed between the resistance furnace and the analyzer. For the TIC determination, the sample is treated with acid in the TIC module. TIC and total carbon (TC) can be alternately analyzed without modifications. For TIC analysis the sample is treated with acid in an Erlenmeyer flask inside the TIC-module. The acid decomposes the carbonates in the sample, creating CO2. The oxygen flow purges the CO2 out of the flask, through to the infrared detector. TC is determined when the sample is introduced into the furnace for combustion and IR detection.
Analysis procedure
An empty flask is placed on the balance. The tare button is pressed. The sample is put into the flask. The sample weight is entered into the analyzer by pressing a key. A magnetic stirrer is placed into the flask. The flask is attached to the TIC-module and the heated platform is raised. The start key is pressed. The acid is injected with the magnetic stirrer rotating. The CO₂ is released from the sample. The infrared cell begins detection. When all the CO₂ has been released from the sample, the detector`s signal will return down to the baseline level and the analysis will be terminated.

Preheating crucibles
		The ceramic crucibles for the induction furnace can be preheated in the high temperature furnace HTF-540. The preheating reduces the blank value of the crucibles. This is important for analysis in the very low ppm range. The crucibles are inserted into the furnace tube and they remain preheated in the tube until needed. Each time a crucible is needed, a new one is inserted into the tube, and a preheated crucible falls out the other end of the furnace tube. The recommended preheating temperature is between 1250°C and 1350°C.

Auto loader for the induction furnace

The CS-2000 can be supplied with an automatic sample loading system. This loading system may also be retrofitted at a later date. The features of the loading system are:
• Unlike many other auto loaders the ELTRA system can accomodate 130 samples giving hours of unattended operation. On request, the loader can be delivered for more crucibles.
• The auto loader, which does not occupy any additional bench space, is mounted above the area where the balance, PC, monitor and consumables are normally situated.
• The crucible positions in the loader are easily accesible to the operator even from a sitting position.
• Three available models for 130, 104 and 36 crucibles.
• Additional samples can be added whilst the system is running and the “out of the sequence” feature will allow urgent samples to be analysed immediately.
• Dispensers for accelerators are available. Depending on the applications, up to two dispensers can be attached to the analyser, for example, one for tungsten and one for iron accelerator. The dispensers are controlled by the loader software.
• Absolutely reliable.
• Reasonably priced.
For installing the auto loader, the resistance furnace should be positioned to the right of the analyser.