Buchi DuMaster D-480 User Manual download pdf (Page 216)

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101

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).

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Buchi DuMaster D-480 User Manual Page 216

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