Buchi K-435 Manuale utente
1
Digestion Unit K-435 Table of Contents
Table of Contents
Please read these operating instructions carefully before using
the Digestion Unit K-435. Keep these instructions in the
proximity of the apparatus so that you can consult them
immediately whenever necessary.
The apparatus should not be connected to the power supply
and turned on until all of the necessary preparations have
been completed. Chapter 2 contains important safety
instructions. Read them carefully; they are essential for the
safe operation of the apparatus.
Technical changes may be made without prior notice. The
reprinting of these operating instructions or excerpts thereof
is expressly forbidden. They may not, either wholly or in part,
be reproduced or rewritten, copied, or distributed by the use
of electronic or optical systems without the express written
permission of the firm BÜCHI Labortechnik AG. All rights
reserved. Copyright © BÜCHI Labortechnik AG 2008
en, Version E Order code
K-435 Operating Instructions 96721
1Supplied Materials 2
2Safety 3
2.1 Symbols 3
2.2 Requirements for the User 3
2.3 Proper Use 3
2.4 Improper Use 4
2.5 General Risks 4
2.6 Safety Measures 4
3Function 6
3.1 Functional Principle 6
4Installation 7
4.1 Placement 7
4.2. Unpacking 7
4.3 Connections to Power Supply 7
4.4 Hose Connections 8
5Operation 9
5.1 Operational Features 9
5.2 Operational Features and their Function 9
5.3 General 9
5.4 Conducting Kjeldahl Digestion 11
5.5 Conducting Kjeldahl Digestion in
Remote Control Operation 11
5.6 Malfunctions 12
6Maintenance 13
6.1 General 13
6.2 Upkeep 13
6.3 Seals 13
6.4 Changing Insulation 13
6.5 Changing O-rings 14
6.6 Power Supply Fuses 14
6.7 Customer Service 14
7Taking out of operation 15
7.1 Storage/Transport 15
7.2 Disposal 15
8Replacement parts 16
9Appendix 17
9.1 Technical Data 17
9.2 Materials Used 17
9.3 FCC requirements 18
9.4 Declaration of confirmity 19
2
Digestion Unit K-435
1 Scope of delivery
Figure 1: K-435
1Scope of delivery
Description Order code
Version:
K-435 standard 230 V 50/60 Hz 38130
Table1: Apparatus models
Enclosed parts:
4Digestion tubes 37377
2Racks 26730
2Upper insulation plate 26736
2Suction module, complete 26842
2Connections to suction module 26875
2Digestion glass holders, complete 38080
1Contact guard, pre-mounted 26878
1Power cable of the following types:
Type CH 10021
Type Schuko 10029
Type GB 17833
Type AUS 17834
Type USA 33756
1Set of operating instructions in one of
the following languages:
German 96720
English 96721
French 96722
Italian 96723
Spanish 96724
1Packaging 34447
Table 2: Enclosed parts
Optional Accessories:
Water jet pump made of plastic 02913
Cover 17396
Seal PTFE to suction pipe 22442
Collection basin for suction pipe 27737
Condensate flask, complete 25100
Suction module for H2O2digestion 37399
Suction pipe with condensate control 26880
Connecting cable to Scrubber B-414 14738
Control cable to B-436 26849
Büchi Scrubber B-414 37876
Non Kjeldahl digestion set 43677
Suction pipe with ball joint 40158
Table 3: Optional accessories
3
Digestion Unit K-435 2 Safety
2Safety
The apparatus is manufactured according to state-of-the-art
technology and recognized safety regulations.
Nevertheless, using this apparatus can lead to certain risks
and dangers:
•If the apparatus is used by inadequately trained personnel.
•If the apparatus is not used according to these instructions.
2.1 Symbols
Stop
Information about risks which can lead to extensive property
damage or to serious or life-threatening personal injury.
Warning
Information about risks which can lead to personal injury or to
property damage.
Reference
Information which refers to technical requirements. Failure to
heed these requirements can lead to malfunctions, inefficiency,
and production losses.
2.2 Requirements for the User
The apparatus may be used only by laboratory personnel or
other persons who due to their training or professional
experience are capable of recognizing possible dangers which
might arise from the use of the apparatus.
2.3 Proper Use
The apparatus was designed and built for laboratory use. Its
proper use is the heating of concentrated sulfuric acid for
oxidation of organic sample components.
4
Digestion Unit K-4352 Safety
2.4 Improper Use
Any use of the apparatus other than that given above or any
use of the apparatus which is not in accordance with the
technical data shall be regarded as a misuse. The operator
bears the sole responsibility for any and all damage which
may result from such misuse.
In particular, the following uses of the apparatus are prohibited:
•Use of the apparatus in rooms which require ex-protected
apparatus.
•Preparing samples which can explode or ignite due to a
blow, friction, heat, or sparks.
2.5 General Risks
In general, risks can arise from
•Hot sulfuric acid
•Flammable gases or solvent vapors in the immediate vicinity
of the apparatus
•Damaged glass equipment
•Placing the apparatus too close to the wall
(see Chapter 4.1, Placement)
•Burns caused by touching hot glass parts.
The removal of covers using standard tools is prohibited except
for authorized maintenance personnel. The apparatus must
not be started up glass equipment is damaged.
Touching any parts of the apparatus carrying electrical current
can result in fatal injury!
2.6 Safety Measures
It is recommended that the apparatus be operated only under
a ventilation hood.
Protective clothing such as goggles, gloves, and labo-
ratory coats must be worn during operation of the apparatus.
These operating instructions must be regarded as an integral
part of the Digestion Unit K-435 and be available at all times
to operating personnel at the place of operation of the
apparatus. This also applies to instructions in other languages,
which may be ordered separately.
5
Digestion Unit K-435 2 Safety
Modifications
Modifications of the apparatus or of spare parts or accessories
as well as the use of spare parts or accessories other than
those mentioned in these operating instructions is allowed only
with the prior written permission of BÜCHI Labortechnik AG.
Responsibility of the Operator
The operator is responsible for the instruction of his personnel.
Copies of these operating instructions in various languages
can be ordered for this purpose.
The operator shall inform the manufacturer without delay of
any safety-related events which might occur during operation
of the apparatus.
If safe operation of the apparatus no longer appears possible,
the apparatus must be shut down and secured against
unintentional operation.
It must be assumed that safe operation is no longer possible
•if there is visible damage to the apparatus;
•if the apparatus is no longer functioning;
•following a long period of storage under unfavorable
conditions;
•following transport under difficult conditions.
The apparatus must not be operated with flammable
substances.
If it becomes necessary to involve Büchi Service, safety and
environmental protection considerations require that
dangerous substances (e.g., according to EU Regulations L
360, 1976/79, or VBG 16) on or in the apparatus must be
indicated and declared.
6
Digestion Unit K-4353 Function
3Function
Figure 2: Functional Principle of the K-435
The Digestion Unit K-435 is suitable for digestions using boiling
concentrated sulfuric acid within a temperature range of up
to approximately 370° C.
3.1 Functional Principle
aDigestion glasses
bHeating
cSuction module
dHose for water jet pump or to Scrubber B-414
b
a
c
d
7
Digestion Unit K-435 4 Installation
4Installation
4.1 Placement
The apparatus must be set up on a stable, clean, and level
surface.
The apparatus must be placed with its back at a minimum of
30 cm from walls and other objects in order to prevent
damage. Containers, chemicals, or other apparatus may not
be placed behind the unit.
4.2 Unpacking
Keep the original packaging for the event of a later transport.
If the packaging has been damaged, check the apparatus
carefully for glass breakage or damage to the casing.
Ensure that the voltage of the power outlet corresponds to
the voltage given on the apparatus plate. Always connect the
apparatus to a grounded outlet. This will avoid risks due to
internal defects.
4.3 Connection to Power Supply
Before the K-435 is turned on for the first time, ensure that
the power supply voltage corresponds to the voltage given on
the apparatus plate.
Then connect the apparatus to the power supply with the
apparatus cable.
8
Digestion Unit K-435
u
4 Installation
4.4 Hose Connections
Place the contact guard (A) with the pre-mounted hoses on
the apparatus as shown in the photo.
Assemble the connection to the suction module (B) and mount
it on the hose (C) and on the suction module (D).
To exhaust the digestion gases, connect the EPDM hose (E)
to the Scrubber B-414 or a water jet pump (e.g., one made
of plastic, Article No. 02913). Please note that the shortest
possible hose connections should be used.
When a water jet pump is used, unpleasant odors can escape
into the immediate surroundings if the suction is inadequate.
If only a suction module (D) is used, the unused hose (C) must
be closed with a rubber stopper.
The Scrubber B-414 220 V, 240 V can be connected directly
to the K-435 with a connecting cable (Art. No. 14738).
However, care must be taken that the voltage of the scrubber
corresponds to the voltage of the K-435.
If the apparatus is operated without remote control, the control
of the scrubber B-414 is regulated by the main switch on the
Digestive Unit, or in other cases with the Control Unit B-436.
026757 002073
026240 003577
Figure 3: Hose connections, enlarged view
Figure 4: Connection to suction pipe.
uu
u
u
u
u
u
A
E
C
BDDB
C
uD
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