BUCHI DuMaster D-480 - Manual (Page 50)

Operation Manual D-480 ©BÜCH Labortechnik AG
4 - Understanding the instrument and planning its use 50
Setting device parameters
About instrument parameters
You need to know the following about instrument parameters:
 The instrument parameters listed here are average values.
 The optimized instrument parameters from initial start-up are stored on the enclosed installation
CD. The user can optimize them for special applications or extraordinary demands.
 In every operating mode, the instrument parameters required for the analysis process are saved
under Options > Settings > Parameters.
The "Device parameter" dialog
The dialog shows the device parameters currently set. It is opened via
Options > Settings > Parameters. The left field of the dialog lists the parameter categories. By
clicking the corresponding category the associated parameters will appear in the right area of the
dialog.
Temperature parameters
The factory-set temperatures are optimized for best possible sample combustion. The following table
shows the pre-set values in section Temperature and explains the meaning of the parameters:
Parameter Meaning Factory setting
Comb. tube Temperature of the combustion tube,
furnace center 950 °C
Post comb. tube Temperature of the post combustion tube,
furnace left 800 °C
Reduction tube Temperature of the reduction tube, furnace
right 815 °C
O
2
dosing parameters
The factory-set O
2
dosing parameters of the analyzer are selected in order to provide optimum
evaluation of the measuring signal under normal application conditions. The following table shows the
pre-set values in section O
2
-dosing and explains the meaning of the parameters:
Parameter Meaning Factory setting
O
2
delay Defines the time to wait after loading before
beginning O
2
dosing.
45 s
Time parameters
The factory-set time parameters of the analyzer are selected in order to provide optimum evaluation
of the measuring signal under normal application conditions. The following table shows the pre-set
values in section Times and explains the meaning of the parameters:
Parameter Meaning Factory setting
Autozero delay Starts autozero alignment after this delay
time has elapsed. 15 s
Peak anticipation After the integrator reset, the N peak is
expected during that time. Otherwise, the
integration is aborted. 50 s
Int. res. delay Serves to avoid the integration of the detector
instabilities during sample feeding. 25 s
Max. integration time Defines the maximum duration of the peak
integration. 300 s