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Field of application: rapid, simultaneous determination of carbon and sulfur from steel, cast iron, copper, cement, ceramics, carbides, sand, glass and similar solid samples.
Construction: the device consists of two units: the analyzer and the control computer. The high-frequency furnace is located in the analyzer housing. The computer controls the device and processes the measurement data.
Operating principle: the entire process takes place similarly to the CS-r type (resistance-heated furnace) device described above, only the differences are highlighted here.
The high-frequency furnace has automatic closing and opening. In addition to the oxygen that feeds the combustion and also plays the role of the carrier gas, compressed air that operates the pneumatics of the furnace is also needed.
More detailsThe sample to be analyzed is measured into a ceramic vessel. Outer diameter of the jar: 25.4 mm. A combustion accelerator (tungsten granulate) is added as necessary. The crucible containing the sample is placed on the pedestal of the furnace, and after starting, the device automatically takes the crucible into the high-frequency furnace.
The furnace practically consists of a quartz combustion tube and the heating coil surrounding it. High-frequency heating is very fast. The sample reaches the firing temperature within a few seconds, so a continuous flow of oxygen is sufficient.
Due to the high temperature, the particles of the burning material can end up on the wall of the combustion tube. Since the furnace has automatic cleaning, at the end of the analysis, the cleaning structure removes the majority of these particles. Due to the special solution, ELTRA gives a lifetime guarantee for the cleaning brush, should it not wear out, but burn.
Combustion products from the furnace enter the analyzer through different filter/cleaning materials, passing through individual channels, where infrared sensors (CO2 and SO2) sensitive to the materials provide the signal to the processing unit.
A typical sample weight - for steel and cast iron samples - can be between 0.5 and 1 gram.
Thanks to the particularly fast heating and intelligent energy regulation, the ELTRA CS-i type device can measure a 20 gram sample when analyzing copper. It is not necessary to add a combustion accelerator to the copper sample! This is very important if the sample has a very low C and S content, because the C and S content of the combustion accelerators is of the same order of magnitude as that of the sample.
When measured in the low C range, the C content in the crucibles (high blank) can give false results. Therefore, it is advisable to heat the jars before the analysis. ELTRA's HTF-540 tube furnace is excellent for this purpose. ELTRA's analyzer uses a crucible with a diameter of 25.4 mm and a height of 27.5 mm.
The crucible to be cleaned is inserted into the combustion tube at the beginning of the furnace. There are several crucibles in the furnace at the same time, they push each other, so that when the pipe is full, the crucible, which has cooled down almost completely, falls out into a container.
The recommended annealing temperature can be set between 1,250 and 1,350 °C.
Automatic pattern changer
CS-i charging can be automated. ELTRA's automatic sample changers serve this purpose. The sample changers are made with a different number of positions, so there are sample changers accommodating 36, 104 and 130 jars.
Up to two dispensers supplying combustion accelerators (tungsten and iron) can be connected to the sample injector.
The sample changer can also be installed on the analyzer later, the UNI software is also suitable for managing the sample changer. The sample changers are space-saving (they can be placed above the analytical balance and laptop, which are required anyway), so they do not require more space than the basic configuration.
Oxygen saving mode
If no analysis is performed for a period of time (set by the user), the device switches to "gas saving" mode. In this case, the amount of oxygen flowing through the system is significantly reduced, the control of the gas system allows only enough carrier gas flow so that the infrared cells are able to measure immediately when a measurement is initiated.
Possible channels of the ELEMENTRAC CS-i analyzer: | |
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Low Carbon: | Manufactured to 0.1% C (for a 500 mg sample, 0.5 mg C content) |
High Carbon: | Manufactured to 5% C (for a 500 mg sample, 25 mg C content) |
Sensitivity to carbon: | 0.1 ppm C, or 0.05 mg C (for a 500 mg sample) |
Accuracy for low carbon: | ± 1 ppm C, for 1 g of sample, or ± 0.5 % of C content |
Accuracy for high carbon: | ± 100 ppm C for 500 mg sample, or ± 0.5 % of C content |
Low sulfur: | Manufactured to 0.3% S |
High sulfur: | max. Made for 30% S |
Sulfur sensitivity: | 0.1 ppm S, or 0.05 mg S (for a 500 mg sample) |
Accuracy for low sulfur: | ± 1 ppm S for 1 g of sample, or ± 0.5 % of the S content |
Accuracy for high sulfur: | ± 0.1 % S, for a 150 mg sample. ±150 mg S, or 0.5% of the S content |
Specifications: | CS-i |
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CS-i analyzer manufactured for 1-4 channels with full PC control, induction (high frequency) heating oven - which is equipped with an automatic cleaning mechanism - gas cleaning oven (option), electronically controlled gas system. Consumables (crucible, accelerators, chemicals, calibration standards, etc.) must be ordered separately! Can be connected to an analytical balance or printer (option). | |
Carrier gas: | 99.5% pure oxygen, 2 – 4 bar, 3 liters/minute |
Operating gas: | compressed air 4 – 6 bar |
Measuring time: | 40 – 50 sec (normally) |
Filter materials: | CO2 trap; high purity sodium hydroxide |
Water trap: | magnesium perchlorate |
Catalyst: | copper oxide or Pt/Si |
Voltage: | 230 V / 50 Hz |
Max. power consumption: | 15 A (at one phase), 3,450 Watt |
Weight: | approx. 110 kg |
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