BUCHI DuMaster D-480 - Manual (Page 215)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 215
When to clean the quartz glass bridge
The quartz glass bridge must be checked for soiling after every tube change and, if necessary,
cleaned.
Process
The section is divided into the following phases:
 Cleaning the quartz glass bridge
 Reinstalling the quartz glass bridge
 Follow-up instrument preparation, gas pressure / gas-tightness
 Performing the necessary follow-up work
Requirements
Before starting work, the following requirements must be met:
 Remove the quartz glass bridge. Cf. Removing the quartz glass bridge (on page 214).
 Allow the quartz glass bridge to cool down.
 Keep the following ready:
 pipe cleaner
 Detergent
 Distilled water
Safety instruction
Strictly observe the safety instruction "Installing/removing and cleaning the quartz glass bridge" under
Warning notes during operation (on page 24).
Phase 1: Cleaning the quartz glass bridge
Proceed as follows:
 Remove the o-rings from the ground-in connection of the quartz glass bridge. Check whether the
o-rings need to be replaced. See Replacing sealing elements.
 Clean the quartz glass bridge. Put it...
 ... either into an ultrasonic bath filled with a commercial laboratory rinsing agent for 20
minutes...
 ... or in a commercial laboratory rinsing agent overnight.
 Remove heavy contaminations with a pipe cleaner.
 Then rinse the quartz glass bridge thoroughly with distilled water.
 Dry the quartz glass bridge.
 Insert the o-rings in the ground-in connections. Use new o-rings if necessary.
Phase 2: Re-installing the quartz glass bridge
Before starting work, the following requirements must be met:
 The instrument must be in "Replace part" status. See Replacing part (on page 301).
 The front door has to be opened.
Proceed as follows:
 Connect the combustion and reduction tube with the quartz glass bridge by means of two
ground-in clamps.