Digest System K�437
Operation Manual
11593500
en
Table of contents
3 K-437 Operation Manual, Version A
Table of contents
1 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 User qualification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Proper use K-437 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Proper use COD Accessory with K-437 . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Improper use COD Accessory with K-437. . . . . . . . . . . . . . . . . . . . . . . . 6
2.5 Warning notices used in this manual . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.6 Product safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.6.1 Instrument-related hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.6.2 Other hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.6.3 Safety measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.7 General safety rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1.1 Standard instrument K-437 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1.2 Standard instrument COD Accessory . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.3 Standard accessories K-437 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.4 Standard accessories COD Accessory . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.5 Optional accessories K-437 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Technical data overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3 Materials used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Description of function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Functional principle of the Digest System . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Functional principle of the COD Accessory . . . . . . . . . . . . . . . . . . . . . . 15
4.3 Controls of the Digest System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4 Rear connections of the Digest System . . . . . . . . . . . . . . . . . . . . . . . . 15
5 Putting into operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1 Installation site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3 Hose connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Read this manual carefully before installing and running your system and note the safety precautions
in chapter 2 in particular. Store the manual in the immediate vicinity of the instrument, so that it can be
consulted at any time.
No technical modifications may be made to the instrument without the prior written agreement of
BUCHI. Unauthorized modifications may affect the system safety or result in accidents.
This manual is copyright. Information from it may not be reproduced, distributed, or used for competitive purposes, nor made available to third parties. The manufacture of any component with the aid of
this manual without prior written agreement is also prohibited.
The English manual is the original language version and serves as basis for all translations
into other languages. If you need another language version of this manual, you can download available versions at www.buchi.com.
Table of contents
4
K-437 Operation Manual, Version A
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2 Kjeldahl digestion process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 Operating the K-437 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.4 Service menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.1 Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.2 Glass parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.3 Digestion tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.4 Sealing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.4.1 Cleaning the seals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.4.2 Replacing the seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.5 Exhaust unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.6 Power supply fuse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.7 Customer service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.1 Malfunctions and their remedy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9 Shutdown, storage, transport and disposal . . . . . . . . . . . . . . . . . . . . . . . . 27
9.1 Storage and transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9.2 Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10 Spare parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
11 Declarations and requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
11.1 FCC requirements (for USA and Canada) . . . . . . . . . . . . . . . . . . . . . . . 30
11.2 Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1 About this manual
5 K-437 Operation Manual, Version A
1 About this manual
This manual describes the Digest System and provides all information required for its safe operation
and to maintain it in good working order.
It is addressed to laboratory personnel in particular.
NOTE
The symbols pertaining to safety (WARNINGS and ATTENTIONS) are explained in chapter 2.
Reference documents
For information on the Digestion Unit and the Scrubber, please refer to the corresponding manuals
available in English, German, French, Italian and Spanish
Digest Automat K-432/438, Operation Manual numbers 96765 - 96769•
SpeedDigester K-425/K-436, Operation Manual numbers 11593346 - 11593350•
SpeedDigester K-439, Operation Manual numbers 11593351 - 11593355•
Scrubber•
2 Safety
6 K-437 Operation Manual, Version A
2 Safety
This chapter points out the safety concept of the instrument and contains general rules of behavior
and warnings from hazards concerning the use of the product.
The safety of users and personnel can only be ensured if these safety instructions and the safetyrelated warnings in the individual chapters are strictly observed and followed. Therefore, the manual
must always be available to all persons performing the tasks described herein.
2.1 User qualification
The instrument may only be used by laboratory personnel and other persons who on account of
training or professional experience have an overview of the dangers which can develop when
operating the instrument.
Personnel without this training or persons who are currently being trained require careful instruction.
The present Operation Manual serves as the basis for this.
2.2 Proper use K-437
The instrument has been designed and built for laboratories. It serves for the heating of concentrated
sulphuric acid for oxidation of organic sample components.
2.3 Proper use COD Accessory with K-437
The instrument has been designed and built for laboratories. It serves for the heating of samples for a
following COD (chemical oxygen demand) determination.
2.4 Improper use COD Accessory with K-437
Applications not mentioned above are improper. Also, applications, which do not comply with the
technical data, are considered improper.
The operator bears the sole risk for any damages caused by such improper use.
The following uses are expressly forbidden:
Use of the instrument in rooms which require ex-protected instruments.•
Use on samples, which can explode or inflame (e.g. explosives, etc.) due to shock, friction, heat or •
spark formation.
2 Safety
7 K-437 Operation Manual, Version A
2.5 Warning notices used in this manual
WARNING
Generally, the triangular warning symbol indicates the possibility of personal injury or even loss of life
if the instructions are not followed.
WARNING
Hot surface.
WARNING
Electrical hazard.
WARNING
Biohazard.
WARNING
Pinch point. Mechanical hazard.
ATTENTION
With the general “Read this” symbol, ATTENTIONs indicate the possibility of equipment damage,
malfunctions or incorrect process results, if instructions are not followed.
NOTE
Useful tips for the easy operation of the instrument.
2.6 Product safety
The Digest System is designed and built in accordance with state-of-the-art technology. Nevertheless, risks to users, property, and the environment can arise when the instrument is used carelessly or
improperly.
The manufacturer has determined residual dangers emanating from the instrument
if the instrument is operated by insufficiently trained personnel.•
if the instrument is not operated according to its proper use.•
Appropriate warnings in this manual serve to make the user alert to these residual dangers.
2.6.1 Instrument-related hazards
Pay attention to the following safety notices:
WARNING
Potential implosion risk if used with damaged glassware.
Beware of damaged or cracked glass parts.•
WARNING
Potentially hot surfaces during operation, especially at the glass parts or due to hot sulphuric acid.
Always be aware of the risk of being burned.•
2 Safety
8 K-437 Operation Manual, Version A
WARNING
Potentially lethal voltage inside the instrument.
Do not remove covers and other parts protecting from electricity.•
Always keep the areas of electric parts, such as power supply plug, mains switch, etc. dry.•
WARNING
In order to avoid injuries to the hands and fingers the machine may not be manipulated during the
lifting action.
2.6.2 Other hazards
WARNING
Certain solvents in or in the vicinity of the Digest System can form peroxides and/or are highly inflammable.
Always be aware of the explosion risk when working with hazardous substances or with •
substances of unknown composition.
Always provide a good ventilation within or in the vicinity of the system.•
2.6.3 Safety measures
In case a safe operation of the instrument no longer appears possible, the instrument must be shut
down and secured against inintentional operation.
It must be assumed that safe operation is no longer possible:
if there is visible instrument damage,•
following a long period of storage under unfavorable conditions,•
following transport under difficult conditions.•
Always wear personal protective equipment such as protective eye goggles, protective clothing and
gloves when working with the instrument.
2 Safety
9 K-437 Operation Manual, Version A
2.7 General safety rules
Responsibility of the operator
The head of laboratory is responsible for training his personnel.
The operator shall inform the manufacturer without delay of any safety-related incidents which might
occur during operation of the instrument. Legal regulations, such as local, state and federal laws
applying to the instrument must be strictly followed.
Duty of maintenance and care
The operator is responsible for ensuring that the instrument is operated in proper condition only, and
that maintenance, service, and repair jobs are performed with care and on schedule, and by authorized personnel only.
Spare parts to be used
Use only genuine consumables and genuine spare parts for maintenance to assure good system
performance and reliability. Any modifications to the spare parts used are only allowed with the prior
written permission of the manufacturer.
Modifications
Modifications to the instrument are only permitted after prior consultation with and with the written
approval of the manufacturer. Modifications and upgrades shall only be carried out by an authorized
BUCHI technical engineer. The manufacturer will decline any claim resulting from unauthorized modifications.
3 Technical data
10 K-437 Operation Manual, Version A
3 Technical data
This chapter introduces the reader to the instrument specifications. It contains the scope of delivery,
technical data, requirements and performance data.
3.1 Scope of delivery
Check the scope of delivery according to the order number.
NOTE
For detailed information on the listed products, see www.buchi.com or contact your local dealer.
3.1.1 Standard instrument K-437
Table 3-1: Standard instrument
Product Order number
K-437 230 V 50/60 Hz standard 38584
K-437 230 V 50/60 Hz
with condensate trap
40316
3 Technical data
11 K-437 Operation Manual, Version A
3.1.2 Standard instrument COD Accessory
Table 3-2: Versions of COD Accessories
Product Order number
COD Accessory for Digestion Sytem
K-437 or Digest Automat K-438
43960
Digest System K-437 with COD Accessories
43963
3.1.3 Standard accessories K-437
Table 3-3: Standard accessories K-437
Product Order number
1 suction module, complete 38561
1 rack, 20 spaces 38621
20 digestion tubes (5 x set of 4 tubes) 37377
1 EPDM hose, 1.5 m, 8 mm 11056005
1 power cable
Type CH 10021
Type Schuko 10029
Type GB 17833
Type USA 33756
Type AUS 17834
1 Operation Manual:
English 11593500
German 11593501
French 11593502
Italian 11593503
Spanish 11593504
1 packaging 35161
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