Buchi K-435 Manuale utente

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

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

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

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.

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.

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.

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

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.

Digestion Unit K-435

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.

BDDB

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