BUCHI DuMaster D-480 - Manual (Page 237)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 237
To prepare the instrument for maintenance work follow the instructions in Preparing and following
up maintenance work (on page 171).
Phase 2: Removing the drying tubes
Proceed as follows:
 Open the front door.
 Unscrew the small drying tube (1). Loosen the red caps.
 Remove the small drying tube (1) from the instrument.
 Unscrew the large drying tube (2). Loosen the red caps.
 Remove the large drying tube (2) from the instrument.
Phase 3: Installing drying tubes, getting the instrument ready to measure
Proceed as follows:
 Screw the small drying tube on again.
 Screw the large drying tube on again.
 Close the front door.
 Close the "Replace part" dialog in the operating software. To do so, click Finish in the "Replace
part" dialog. By doing so, the gas will be automatically turned on. and the atmospheric nitrogen is
removed by flushing with CO
2
for five minutes.
 Decide:
If...
 ... approximately the same flow and pressure values as prior to maintenance work are
displayed: The instrument is ready to measure again.
 ... distinctly different flow and pressure values to those displayed prior to maintenance work
are displayed: Perform a leak test. See Performing a leak test (on page 242). The
instrument is only ready to measure when the leak test is successful.
To be observed after maintenance
If you have performed maintenance work that has a defined maintenance interval, you must manually
reset the "Status" field to zero on the "Maintenance intervals" dialog (accessible via Options >
Maintenance > Intervals. See Defining maintenance intervals in the software (on page 170).