BUCHI DuMaster D-480 - Manual (Page 216)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 216
Note: When you close a ground-in ball-and-socket joint, you must be able to feel an elastic
resistance when you press-in the o-ring, otherwise you must replace the o-ring.
 Close the front door.
Phase 3: Follow-up work, gas pressure/ tightness
 After completing all maintenance work, put the instrument back into a state ready for
measurement. See Start-up (on page 109).
Phase 4: Performing the necessary follow-up work
Proceed as follows:
 Perform blank value determinations to test complete combustion. See Determining blank
values (on page 144). Allocate an oxygen dosing time of 90 s to the sample.
 Only stop the measurements once you have reached low, stable blank values. See "Measure of
gas-tightness (N blan value)" in Types of blank value determination and their settings (on
page 143).
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).