BUCHI DuMaster D-480 - Manual (Page 142)

Operation Manual D-480 ©BÜCH Labortechnik AG
7 - Using the instrument 142
 Measure a maximum of 50 real samples.
 At the end of the series, measure the following daily factor sample four times and check the daily
factor:
 250 mg glutamic acid with method "Standard".
Checklist for blank value / conditioning and daily factor measurements
Purpose
The checklist helps you to check whether the instrument is ready to measure blank value,
conditioning and daily factor samples.
Checklist
Go through the following list:
 Are the operating gases on?
 Are the furnaces at setpoint temperature?
 Combustion tube: 950 °C
 Post combustion tube: 800 °C
 Reduction tube: 815 °C
 Is pressure OK?
 Display on the PC "Press. Input": 1200 - 1250 mbar
 Display on the PC "Press. Output": 800 - 1000 mbar
 Is the flow meter display OK?
 Measuring gas flow meter on the PC "MFC CO2": 650 ml/min
 CO
2
flow meter on the PC "Flow CO2": approx. 650 ml/min
 O
2
flow meter on the PC during O
2
dosing "MFC O2": as selected in the method
 Does the desiccant still have sufficient capacity?
 At least the last third should still be unused.
 Have the maintenance intervals been observed? Check:
 The drying tube.
 The reduction tube.
 The ash crucible.
 Is the detector signal small and stable?
 Is the proper method allocated to the respective samples?
 Is the carousel loaded?
If you answer yes to all of the above, you can start measuring blank value, conditioning and daily
factor samples.
Checklist for real sample measurement
Purpose
The checklist helps you to check whether the instrument is ready to measure real samples.