Buchi DuMaster D-480, Руководство по эксплуатации

Страница: 176 / 354

Operating instructions DuMaster D-480 ©BÜCHI Labortechnik AG
8 - Maintaining the instrument 176
Process
The section is divided into the following phases:

Prepare samples and perform measurement

Ascertaining appropriate calculation methods

Set calculation methods, perform calculation

Optimizing calibration curves and apply calibration
Requirements:
Before starting work, the following requirements must be met:

Read
Background knowledge required for calibration
(on page 51) and
Assessing the
calibration curves
(on page 179).

Prepare a suitable balance. A reading precision of 0.01 mg is usually sufficient.

If you have not already done so, define the following by selecting
Options > Settings >
Standards
...

... the required calibration substances. See
Defining standard substances as calibration
samples
(on page 120).

... the required substances for daily factor determination. See
Defining standard
substances as factor and monitor samples
(on page 120).

Check and optimize the condition of the instrument. Otherwise it makes no sense to calibrate.
See Optimizing instrument condition for calibration.
Phase 1: Prepare samples and perform measurement
Please observe the following instruction:
Caution
Inserting multiple samples into the ball valve (only for
solid operation)
If there are samples in the carousel while you are changing the position of the
carousel via
System > Carousel 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. Cf.
Preparing samples
(on page 123).

Prepare the samples for determining the daily factor. Use 3 x aspartic acid at 250 mg with
method "Standard".

Prepare conditioning samples and calibration samples. Refer to Calibration tables for the
recommended settings for each mode.

Insert the samples on the carousel.

Enter the following sample data in the sample view (text view) on the PC:

weight in [mg] if it has not been transmitted by the balance,

the name of the sample (max. 32 characters):
"Blnk" for blank samples,
Daily factor or calibration samples must have the name defined in
Options > Settings >
Standards
.

Select an appropriate method for run-in and calibration samples according to the following list: