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SC-800
Surfaces-Carbon
Determinator |
 Carbon/Sulfur
models
CS-530,
CS-2000
Oxygen/Nitrogen
models
ON-900,
ONH-2000
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| Overview |
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The SC-800 is designed for the determination of carbon
on the surface of metals, ceramics, glass, etc.
using up to date combustion technology. The detection
method is infrared absorption of CO2. The SC-800 can
be supplied with two independent infrared cells. The
sensitivity of these cells can be customized to meet
specific requirements. The IR-absorption lenghts can
be individually selected to offer optimum precision
for the analysis of high and low levels of carbon. The
SC-800 features a microcontroller, a high temperature
resistance furnace and solid state infrared detectors
with auto zero and auto range control. |
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| Operating technique |
The
sample surface is entered into the PC, in cm². The sample
is put into the combustion boat. The quartz glass boat with
the sample is placed into the open end of the combustion tube.
Then the start key is pressed and the analysis cycle beginns.
The boat is pushed into the hot zone of the furnace. At the
end of the cycle the analysis results appear on the monitor
of a connected PC. |
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| Gas dose calibration |
The
SC-800 can be calibrated with standard samples or alternatively,
by a built-in gas dosing device using CO2 calibration gas.
The calibration value is entered into the memory in mgC/dm².
After starting the calibration analysis cycle, the gas dosing
device injects a certain volume of calibration gas CO2 into
the gas flow system. After the end of the cycle, the analyzer
is calibrated. |
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| Electronic flow controler |
An essential part of the gas flow system is the electronic
flow controller. This provides a stable gas flow, thus eliminating
the known disadvantages of mechanical flow controllers. The
instrument operates at atmospheric pressure thus reducing
the problems of leaks associated with pressurized systems. |
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| 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.
Click software
from the main menu for more information about software.
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| Infrared
Cells |
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The infrared cells of the SC-800 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 SC-800 can be
equipped with up to two independent infrared cells for
carbon determination. The lengths of both 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. |
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| Sample sluice |
The
unique design of the sluice for entering the sample into the
furnace eliminates the risk of getting air and consequently
also CO2 into the system. This is a very essential aspect,
for the following reasons:
1. The infrared detector is very sensitive in CO2, in order
to keep the detection limit as low as possible.
2. The open diameter of the combustion tube must be very large,
in order to enable the analysis of big samples.
3. The oxygen consumption should be as low as possible, which
means low oxygen flow coming out of the furnace open end preventing
the air from entering the system. |
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| The solution: |
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The
open end of the combustion tube is reduced to a small hole
of a quartz part, during stand-by respective before and after
every analysis. |
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The boat with the sample is pulled into a boat holder before
entering the furnace. |
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The boat is hooked to the quartz closure and the boat holder
is pushed over the combustion tube. The boat is then pushed
by using the same stick, up to the hot zone. After the end of
the analysis, the boat is pulled out of the furnace and is removed
in the boat holder. The quartz closure remains inside the open
end of the combustion tube, as it was before the analysis. |
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Next:
SC-800 Specifications |
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