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Instrument Database:
Eltra GmbH - CHS-500 Carbon / Hydrogen / Sulfur Determinator
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| Year of introduction |
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| Status |
available |
| Company |
Eltra GmbH
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| Categories |
Element Analyzer: CHNOS
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The CHS-500 incorporates the latest technology. It is designed for the rapid simultaneous determination of carbon, hydrogen and sulfur in materials such as coal, coke, ores, minerals, slags, etc.
The CHS-500 is equipped with three independent infrared cells. The sensitivity of these cells can be customized to meet specific requirements. The IR-absorption lengths can be individually selected to offer optimum precision for the analysis of high and low levels of each C, H and S. The CHS-500 features a microcontroller, a high temperature resistance furnace up to 1550°C and solid state infrared detectors with auto zero and auto range control. Separate cabinets eliminate any influence of temperature between the furnace and the analytical unit. The modular design makes servicing much easier compared to single cabinet analyzers. The combustion gases coming from the furnace pass through the Hydrogen cell first and then through a moisture absorber. The dried water-free gases then pass through the CO2 and SO2 cells. As there is no moisture present in the CO2 and SO2 cells, there cannot be any influence from the hydrogen present on the carbon and sulfur results.
Analysis procedure
The sample is weighed into a combustion boat on an electronic balance which is interfaced to the PC. By pressing a key the sample weight is transferred into the PC. If required the sample weight can also be entered manually. The boat with the sample is placed on the furnace entrance. The start key is pressed and the analysis cycle begins. The sample is pushed into the furnace. At the end of the cycle, the analysis results appear on the PC screen.
Infrared Cells
The infrared cells of the CHS-500 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 CHS-500 is equipped with three independent infrared cells for C, H and S determination
The lengths of the cells can be individually optimized, to obtain maximum precision for the target analysis levels of each customer.
The Hydrogen infrared cell is heated at a temperature remarkably higher than 100 ° in order to avoid moisture condensation.
Solid gold infrared path
The CHS-500 is a high quality product, furnished with infrared paths made from solid gold. These tubes will allow cleaning without loss of performance and sensitivity. It is not possible to effectively clean metal and glass tubes that have been gold-plated. These platings are typically only a few microns thick, thus requiring the replacement of the tubes when they are contaminated.
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)
Combustion 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.
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.
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| Specifications |
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MEASURING RANGES
Carbon
Up to 500mg C resp. up to 100% C at 500 mg sample
Indicating range
Up to 100% C
Hydrogen
Up to 75mg H resp. up to 15% H at 500 mg sample
Indicating range
Up to 100% H
Sulfur
Up to 10mg S resp. up to 2% S at 500 mg sample
Indicating range
Up to 100% S
SENSITIVITY
Carbon
5 µg C resp. 10 ppm C
at 500 mg sample
Hydrogen
50 µg H resp. 100 ppm H
at 500 mg sample
Sulfur
1 µg S resp. 2 ppm S
at 500 mg sample
ACCURACY
Carbon
±50 µg C resp. ±100ppm C at 500 mg sample or ± 1% of C present
Hydrogen
±100µg H resp. ±200ppm H at 500 mg sample or ± 1% of H present
Sulfur
±2µg S resp. ±4ppm S at 500 mg sample or ± 1% of S present
GENERAL SPECIFICATIONS
Normal sample weigth
200-300 mg for coal
Normal analysis time
50 to 180 seconds
Furnace temperature
Adjustable up to 1550 °C
Gas required
Oxygen 2 to 4 bar (30 to 60 psi) 3l/min
Interfaces
Computer - serial
Chemicals
CO2 trap - sodium hydroxide
H2O trap - magnesium perchlorate
Analyzer power requirements
230 V AC ±10% 50/60 Hz
0.33 A / 75 W
Furnace power requirements
230 V AC ±10% 50/60 Hz
Maximum heat up current 20 A
Weigths
Analyzer
40kg
Furnace
36kg
Dimensions
Analyzer: (W)55cm (21") (H)52cm (20.5") (D) 60cm (23.5")
Furnace: (W)33cm (13") (H)52cm (20.5") (D) 60cm (23.5")
ACCESSORIES
Balance: 0.0001g to 60 g ± 0.0001 g
Computer: PC with HDD, 3.5" drive, CD-ROM, TFT flat screen and keyboard
Color printer with automatic cut sheet feed, other options on request
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