Buchi DuMaster D-480, Operation Manual

Page: 231 / 354

Operating instructions DuMaster D-480 ©BÜCHI Labortechnik AG
8 - Maintaining the instrument 231

Reduce CO
2
pressure at the delivery point until the CO
2
flow meter displays "Flow CO2" on
screen at approx. 400 ml/min.

Wait the required conditioning time. See table of "conditioning rules" in Conditioning newly
installed tubes.

Close the ground-in clamp on the reductor outlet.

Set CO
2
intake pressure on the cylinder manometer so that...

... the "Pressure" display shows 1300 - 1350 mbar on screen.

... the measuring gas flow meter "MFC-TCD" displays 700 ml/min on screen.

... the CO
2
flow meter "Flow CO2" displays approx. 700 ml/min. on screen.

Decide:

If approximately the same flow and pressure values as prior to maintenance work are
displayed: The instrument is ready to measure again.

If distinctly different flow and pressure values to those displayed prior to maintenance work
are displayed: Perform a leak test. See Performing a leak test. The instrument is only ready
for further conditioning 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.