BUCHI DuMaster D-480 - Manual (Page 139)

Operation Manual D-480 ©BÜCH Labortechnik AG
7 - Using the instrument 139
When is routine measuring work necessary?
You must perform routine measuring work before measuring real samples:
 if you have not performed any routine measuring work today
 if measuring breaks exceed a duration of 2 hours.
Measuring real samples with preceding routine measuring work
Please observe the following instruction:
Caution Inserting multiple samples into the ball valve (for solids mode only)
If there are samples in the carousel while you are changing the position of the
carousel via System > Sample Position, multiple samples may fall into the ball
valve at the same time. In this case, a service technician is required.
Before changing the position of the carousel, always remove all samples from the
carousel.
Proceed as follows:
 Move the empty carousel to zero position. To do so, open the "Set carousel position" dialog in
the operating software by selecting System > Sample Position.
 Select the radio button next to "Reference run" and click OK. The carousel moves to zero
position.
 Prepare the samples.
 If necessary, prepare samples for determining the blank value.See Types of blank value
determination and their settings (on page 143).
 Prepare conditioning samples for conditioning. Settings can be found in Performing
routine measuring work (on page 140).
 Prepare the samples for determining the daily factor. Settings can be found in Performing
routine measuring work (on page 140).
 Prepare the real samples. Cf. Sample preparation instructions (on page 126).
 Insert the samples on the carousel.
 Enter the weight in [mg] in the sample view (text view) on the PC if it has not already been
transmitted online by the balance.
 Enter the sample name (max. 32 characters) in the sample view (text view):
 Blank values must have the keyword defined via Options > Settings > Keywords (factory
set to "Blnk").
 Daily factor or calibration samples must have the name defined in Options > Settings >
Standards.
 Set method in the sample view (text view):
 For blank samples, cf. Types of blank value determination and their settings (on page
143).
 For conditioning samples, cf. Performing routine measuriement work (on page 140).
 For daily factor samples, cf. Performing routine measuriement work (on page 140).
 For real samples, cd. Values for oxygen dosing (on page 137).
 Go through the measuring start checklist. Cf. Checklist for blank value / conditioning and
daily factor measurements (on page 142).
 Start the analysis process in the operating software:
 Select System > Auto run to start a multiple-sample analysis.
 Select System > Single run to start a single-sample analysis.
 Once measurement is finished, evaluate the measurement.