BUCHI DuMaster D-480 - Manual (Page 178)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 178
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 52) and Assessing the
calibration curves (on page 182).
 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 122).
 ... the required substances for daily factor determination. See Defining standard
substances as factor and monitor samples (on page 122).
 Check and optimize the condition of the instrument. Otherwise it makes no sense to calibrate.
See Optimizing instrument condition for calibration (on page 177).
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 125).
 Prepare the samples for determining the daily factor. Use 3 x aspartic acid á 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.