BUCHI DuMaster D-480 - Manual (Page 236)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 236
Notes regarding further operation
The drying tube fillings must be replaced regularly in order to ensure correct readings. The drying
agent is charged with an indicator which shows the used up zones of the tube. If ¾ of the desiccant is
discolored, the filling must be replaced.
Removing and installing the drying tubes
Function of the drying tubes
The drying tubes bind traces of water that would impair both the IR signal (blank value) and the
lifetime of the IR detector.
Location of the drying tubes
The following picture shows the location of the drying tubes (1, 2) with the front door open:
Process
The section is divided into the following phases:
 Preparing the instrument, gas pressure
 Removing the drying tubes
 Installing the drying tubes, getting the instrument ready to measure
Safety instruction
Strictly observe the safety instruction "Installing/removing the drying tube" under Warning notes
during operation (on page 24).
Phase 1, Preparing the instrument, gas pressure
Safety instruction
Strictly observe the safety instruction "Gas pressure" under Warning notes during operation (on
page 24).