BUCHI DuMaster D-480 - Manual (Page 197)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 197
Removing and dismantling the ball valve
Note
The following section describes the first part of "Ball valve maintenance". The topic is continued in
Cleaning, assembling and installing the ball valve.
Purpose of maintenance
Maintenance of the ball valve serves to avoid ball valve leaks. For this purpose, it is necessary to
remove particles such as dust or sample abrasion that sticks between the ball and the Teflon half
shells. If necessary, half shells and o-rings must also be replaced.
Process
The section is divided into the following phases:
 Allow instrument to cool down and disconnect from the mains
 Pulling the furnace out of the instrument
 Removing the ball valve
 Dismantling the ball valve
Requirements:
Before starting work, the following requirements must be met:
 Remove all samples from the carousel.
 Keep acetone ready to clean components.
 Keep the following tools ready:
 Knock-out
 Hook wrench
 Phillips screwdriver / Allen wrench 3 mm
 Open jawed wrench, 8 mm
 Open jawed wrench, 22 mm
Phase 1: Allow instrument to cool down and disconnect from the mains
Safety instruction
Strictly observe the safety instruction "Hot instrument parts" under Warning notes during operation
(on page 24).
Proceed as follows:
 Open the "Device parameters" dialog in the operating software by selecting Options > Settings
> Parameters.
 Set the setpoint temperature of the furnaces to 0 °C and confirm by clicking OK.
 Wait 2–3 hours until the instrument has cooled down to at least 55 °C.
 Quit the operating software. Execute the following command: File > Exit.
 Switch off the analyzer and its peripherals.
 Disconnect the power supply plug.
 The instrument is now ready for removal of the ball valve.