BUCHI Wet Digester B-440 - Manual (Page 29)

7 Maintenance and repairs
29 B-440 Operation Manual, Version D
soap solution) or in an ultrasonic bath. Visibly check for damages at all the glass components and
sealing surfaces subsequently.
NOTICE
Risk of sealing damage by lubricants or sharp objects.
Do not lubricate sealings s
Do not bring sealings in contact with sharp objects s
Use ethanol or soapy water as detergent only s
7.2.2 Liquid ingress into the instrument
In case of liquid ingress into the housing the instrument is not safe to use anymore. Follow the instruc-
tions below to limit possible damage and safely bring the instrument into operable condition again.
Switch off the Wet Digester and unplug the power cord. s
Use a long forceps to dab liquid off the outer housing parts. Wear safety gloves! s
๓ Let the system cool down completely!
Use a long forceps to dab residual liquid off the heating chamber. s
Wear cut- and acid-safe gloves to wipe out the chamber with dry cloth. s
Use a long forceps to clean the chamber(s) with a wet damp cloth. Let the chamber dry subse- s
quently!
๓ Call service! Do not reconnect the system to mains!
! WARNING
Death or serious burns by electric current.
Switch off the instrument s
Disconnect the power cord and prevent unintentional restart s
All parts must be completely dried before the system can be checked by a service technician!
An electrical safety test and a functional test must be performed before the system can be used again.
7.5 Reflector exchange
Components may only be changed when the equipment has cooled down completely.
The equipment must be disconnected from all mains sources before any components are changed.
Electrical and electronic components may only be changed by appropriately qualified personnel.
Preparations
Switch off the Wet Digester and unplug the power cord. s
๓ Let the system cool down completely!
Carefully remove the vitrified ceramic plate. s
Take out the upper check plates. s