Combi Perfect Match 6525 Manual do Utilizador descarregar pdf (Página 3)

0 1000

2000 3000(;)

VERTICAL SCALE

358

350

300

250

200

150

100

SEC

OXYGEN SIGNAL

INTEGRAL

0.0900

1.0

NITROGEN SIGNAL

INTEGRAL

0.0060

1.0

temperature

oxygen extraction curve

sample

flux

crucible

outgassing

flux

outgassing

lower electrode

graphite crucible

sample holder

flux holder

sample

outgassing

Impressed

wattage

graphite

crucible

flux

gas line

switchover

time

generated gas from

extraction fumace

detector

output

Dual sample/flux introduction mechanism

aster and more precise analysis across the board

Tailored analysis for optimum precision

Precision control of extraction furnace

Control of the extraction furnace gov-

erns the analytical precision. The EMGA

features constant wattage control to

ensure stable extraction conditions and

precise control of the furnace. Tempera-

ture setting, where the furnace tempera-

ture is controlled indirectly by wattage

control, is also available.

Multistep slope power control

High precision wattage control makes

fine temperature-programmed analysis

possible over a full temperature range.

The EMGA features both the con-

ventional slope method, which links

initial and final values, and the multi-

step slope method, in which up to ten

slopes may be combined at will.

Furthermore the furnace control time

can be set at up to 999 seconds for a

continuous temperature adjustment

function.

Real-time temperature hold function

In addition to conventional sequential

analysis with preset analysis conditions,

HORIBA has made it possible for the

operator to hold the extraction tempera-

ture at will in accordance with extraction

peaks. Moreover, it is now possible to

detect extraction gas output at extrac-

tion peaks and automatically hold the

extraction temperature. Once the peak

disappears, the hold is released and the

extraction temperature is raised accord-

ing to the preset curve.

Temperature programmable pattern

memory function

With the automatic hold function, the

temperature rise pattern differs depend-

ing on the nature of the sample. It used

to be difficult to reproduce the exact

same temperature rise pattern. Howev-

er, HORIBA has added a function to

store the temperature rise pattern for

each temperature-programmed analy-

sis. This allows the reproduction of

exactly the same pattern time after time.

For example, you can now acquire sam-

ple blanks under exactly the same condi-

tions as sample analysis, expanding the

range of applications.

Peak level setting function

Peak detection provides the key to main-

taining and releasing the temperature

rise pattern when operated under the

automatic hold mode. Peak levels can

be freely set, so that peak detection in

trace analysis can be performed as well

as making it possible to ignore insignifi-

cant peaks in high concentration analy-

sis.

Multifunctional graphic printout

HORIBA monitors four parameters dur-

ing the analysis and displays them on a

colour screen. The parameters dis-

played are time, temperature, gas

extraction curve and a unique integra-

tion curve. This provides a rapid indica-

tion of the total amount of gas generat-

ed at selected times and allows the

operator to carry out integration at com-

pletely discretionary intervals. After

measurement is completed, an appro-

priate scale is automatically selected.

Graphical data can be printed out and is

easily switched to any time scale or gas

extraction scale desired. It is also possi-

ble to select only the necessary combi-

nations of data to meet specific purpos-

es.

Temperature-programmed analysis Oxygen

Sample : Rust on steel

Fumace control : Automatic temperature hold function

1 2 3 4 5 6 7 8 ... 11 12

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