Buchi DuMaster D-480, Operation Manual

Page: 207 / 354

Operating instructions DuMaster D-480 ©BÜCHI Labortechnik AG
8 - Maintaining the instrument 207
Purpose and frequency of maintaining the Ni flap and O2 lance
Why maintain the Ni flap and the O
2
lance?
Maintaining the Ni flap is necessary because the side facing to the combustion chamber will soil
which can result in an unsafe working of the Ni flap.
The O
2
lance will also be slightly soiled by soot which should be removed.
When to maintain the Ni flap and the O
2
lance?
It is recommended to check Ni flap and O
2
lance with each replacement of the ash crucible and clean
them if necessary.
Automatic Ni flap monitoring
Moreover, the automatic Ni flap monitoring can be enabled/disabled by the control software. As soon
as the program detects a possible contamination of the Ni flap, the analysis will be aborted and a
corresponding error message will be displayed. Further information about this topic:
Error handling
(on page 328).
Removing and cleaning the Ni flap
Note
The following section describes the first part of the maintenance of the Ni flap. The topic is continued
in Installing the Ni flap.
Process
The section is divided into the following phases:

Preparing the instrument, gas pressure

Removing the Ni flap

Cleaning the Ni flap and the Ni flap flange
Safety instruction
Strictly observe the safety instruction "Hot instrument parts" under
Warning notes during operation
(on page 24).
Requirements
Before starting work, the following requirements must be met:

Keep a tube rack ready to hold hot components.
Phase 1: Preparing the instrument, gas pressure
Safety instruction
Strictly observe the safety instruction "Gas pressure" under
Warning notes during operation
(on
page 24).
To prepare the instrument for maintenance work follow the instructions in "Preparing the instrument:
Cool down the furnace, gas pressure" in Preparing and following up maintenance work.