BUCHI DuMaster D-480 - Manual (Page 250)

Operation Manual D-480 ©BÜCH Labortechnik AG
9 - Repairing the instrument 250
Checking air-tightness of instrument
Proceed as follows:
 Perform a leak test to check the air-tightness of the instrument. See Performing a leak test (on
page 242).
 If any leaks are detected, replace all sealing elements in the furnace area. See Replacing sealing
elements.
Stopping continuous analysis
When do I stop continuous analysis?
It makes sense to stop a continuous analysis in the following cases:
 If the result of the blank value indicates that the instrument is leaky.
 If the results of the conditioning sample indicate that parts of the instrument are defective or that
gas pressure and flow behaviors are not OK.
 If results of the daily factor deviate substantially from the last results.
Stopping a continuous analysis spontaneously
Proceed as follows:
 Execute the command System > Single run in the operating software.
 This stops the analysis after measuring the current sample.
Moving a stop marker
The program automatically moves the stop marker to the last sample position during sample data
input. It is therefore only necessary to move the stop marker in special cases.
Nevertheless, if for any reason you have to move the stop marker proceed as follows:
 Open the "Set stop marker" dialog by selecting Edit > Stop tag.
 Use the arrow buttons to set the sample number at which to set a stop marker.
 Click OK. This closes the dialog and moves the stop marker to the desired position.
Re-weighing after sample loss
Sample loss
If you drop a sample on the floor when loading the carousel, for example, the sample is contaminated
and should not be analyzed. You have to prepare and weigh a new sample.
Re-weighing after sample loss
Proceed as follows:
 Prepare the sample again.
 Open the "Set current weight" dialog by selecting Edit > Current weight.
 Use the arrows to specify the sample to re-weigh.
 Click OK. This closes the dialog and the cursor moves to the "Weight" column of the selected
sample number.
 If 21 CFR Part 11 functionality is enabled, the "Comment change" dialog is displayed. Enter a
justification in the "Comment modification" dialog and click Close.