Buchi DuMaster D-480, Operation Manual, Page: 136 / 354

Operating instructions DuMaster D-480 ©BÜCHI Labortechnik AG
7 - Using the instrument 136
Example for optimization of oxygen dosing
O
2
cut off threshold = 30 %, total O
2
amount = 589 ml
O
2
cut off threshold = 40 %, total O
2
amount = 478 ml
Performing measurements
What you need to know
You must have read the Oxygen dosing values section so you can set the correct values for
measuring.
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.