Operating Manual - sepsci.co.za · determination of nitrogen and protein according to the Kjeldahl...

Operating Manual

DKL Fully Automatic Digestion Units

Velp Scientifica – DKL Operating Manual

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DKL8 – DKL12 – DKL20 – DKL42/26

Fully Automatic Digestion Units

Operating manual

Thank you for choosing a DKL Velp fully automatic digestion unit. DKL carries out the fully-automatic preliminary digestion of a variety of samples (food, animal feed, fodder, soil, water…) for nitrogen/protein determination using the Kjeldahl method. The analytical procedure is then completed by treating the digested samples in a Velp UDK steam distillation unit. Safety warnings:

Before using the unit, please read the operating manual supplied with the apparatus carefully. Warning! Hot surface! Protective conductor terminal. Do not dispose of this equipment as urban waste.

This unit must be used for laboratory applications only.

The manufacturer declines all responsibility for any use of the unit that does not comply with the instructions. Improper use or not specified could compromise the safety of the product. SAFETY PRECAUTIONS In order to prevent the risk of electric shock, fire and personal injury when the unit is in use, basic safety measures must always be taken including:

Ensure that liquids do not come into contact with the electric power cable or with the electrical parts of the instrument.

Check that the power supply corresponds to the rating plate on the rear of the unit.

When replacing the power cable, make sure that the new cable has the same characteristics as the original and that it is earthed.

Do not use the unit if it is not working correctly. In case of malfunctioning, contact your nearest service centre.

The personal protective equipment, containers and products used must be compatible with the temperature setting on the instrument.

The personal protective equipment used must be compatible with the risks arising from the material being processed and the glass containers.

The heating block can reach temperatures of up to 450°C. High temperatures are reached and/or maintained during the heating stage, during the work cycle and during cooling at the end of the work cycle.

For applications where the digestion process produces fumes, acid gases or corrosive substances (e.g. the Kjeldahl method), the instrument should be combined with specific fumes suction and abatement systems. See Velp’s models JP fume suction pump code F30620198 and SMS scrubber code F307C0199.

Follow the cleaning instructions described in this manual.


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Precautions d’usage: Avant toute utilisation, veuillez s’il vous plait lire avec attention le manuel d’utilisation livré avec l’appareil. Attention ! Surface brûlante! Borne du conducteur de protection. Merci de ne pas jeter cet appareil avec les déchets.

Cet appareil ne doit être utilisé que pour des utilisations en laboratoire.

Le fabricant décline toute responsabilité en cas de mauvaise utilisation de l’appareil qui ne serait pas conforme aux instructions. PRECAUTIONS D’USAGE Dans le but d’éviter tout risque de choc électrique, enflammement ou blessure quand l’appareil est en marche, quelques mesures basiques de sécurité doivent être prises, telles que:

Assurez vous qu’aucun liquide n’entre en contact avec le câble d’alimentation électrique ou avec les parties électriques de l’instrument.

Contrôlez que la tension électrique corresponde à celle indiquée sur l’étiquette de l’instrument.

Lorsque vous remplacez le câble électrique, veuillez vous assurer que le nouveau câble aie les mêmes caractéristiques que le câble d’origine et qu’il soit à terre.

N’utilisez pas l’appareil s’il ne fonctionne pas correctement. En cas de dysfonctionnement, veuillez contacter votre service technique le plus proche.

L’équipement de protection personnel utilisé doit être compatible avec les risques liés à l’usage de produits chimiques et des gaz qui sont utilisés et décrits dans ce manuel.

L'équipement de protection individuelle utilisé doit être compatible avec les risques découlant de la matière en cours de traitement et les récipients en verre.

Le bloc chauffant peut atteindre des températures allant jusqu'à 450 ° C. Les températures élevées sont atteintes et / ou maintenues lors de l'étape de chauffage, pendant le cycle de travail et au cours du refroidissement à la fin du cycle de travail..

Pour les applications où le processus de digestion produit des fumées, des gaz acides ou de substances corrosives (par exemple, la méthode Kjeldahl), l'instrument doit être combiné avec les vapeurs spécifiques aspiration et les systèmes de réduction des émissions. Voir tous les modèles de Velp JP aspiration des fumées code de la pompe F30620198 et le code SMS laveur F307C0199.

Suivez les instructions de nettoyage décrites dans ce manuel.


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This unit has been designed and produced in compliance with the following standards:

Safety requirements for electrical apparatus for measurement and control and for laboratory use IEC/EN61010-1

IEC/EN61010-2-010

Electrical equipment for laboratory use UL No 61010-1 2nd ed

General requirement – Canadian electrical code CAN/CSA- C22.2 No. 61010-1 2nd ed

CAN/CSA- C22.2 No. 61010-2-010

The manufacturer is committed to constantly improving the quality of the products and reserves

the right to modify the characteristics without prior notice.


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Index

1. Introduction ..................................................................................................... 7 1.1 Parts included ....................................................................................... 8 1.2 Instrument description........................................................................... 9 1.3 Keys and functions ............................................................................. 11

2. Assemby and installation .............................................................................. 12 2.1 Assembly ............................................................................................ 12 2.2 Hydraulic connections ......................................................................... 13 2.3 Electrical connection ........................................................................... 14

3. Operating controls ................................................................................... 15 3.1 Quick guide ......................................................................................... 15 3.2 Main menu .......................................................................................... 16 3.3 Program menu .................................................................................... 18

3.3.1 Program selection ..................................................................... 18 3.3.2 Parameter settings .................................................................... 19

3.4 Print menu .......................................................................................... 20 3.4.1 Print data .................................................................................. 20 3.4.2 Data settings ............................................................................. 20 3.4.3 Print options .............................................................................. 21 3.4.4 PC USB interface settings ........................................................ 22 3.4.5 Data transmission file................................................................ 22

3.5 Language menu .................................................................................. 23 3.5.1 Add languages .......................................................................... 23

3.6 Settings menu ..................................................................................... 23 3.6.1 Date .......................................................................................... 24 3.6.2 Time.......................................................................................... 24 3.6.3 Unit of measure ........................................................................ 25 3.6.4 Contrast .................................................................................... 25 3.6.5 Keyboard sound ........................................................................ 26 3.6.6 Acoustic signal .......................................................................... 26 3.6.7 Blackout alert ............................................................................ 27 3.6.8 Automatic Lift ............................................................................ 27 3.6.9 Drip tray alert ............................................................................ 28

3.7 Instrument information ........................................................................ 28 3.8 Service menu ...................................................................................... 29

3.8.1 Update software ........................................................................ 29 3.8.2 Keyboard Check ....................................................................... 29 3.8.3 Lift Check .................................................................................. 30

4. Start heating ................................................................................................. 30 5. Arrests .......................................................................................................... 32

5.1 Blackout .............................................................................................. 32 5.2 Faulty probe ........................................................................................ 33 5.3 Overheating ........................................................................................ 33

6. End-of-work operations ................................................................................. 33 7. Maintenance ................................................................................................. 34

7.1 Replacing the fuses ............................................................................ 34 7.2 Rearming the safety thermostat .......................................................... 34 7.3 Lubrication of the guide ....................................................................... 34

8. Disposing of the unit ..................................................................................... 34 9. Accessories available on request .................................................................. 35

9.1 Accessories available for analysis ...................................................... 35 9.2 Accessories for testing the heating block temperature ........................ 37


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10. Spare parts .............................................................................................. 38 11. Technical specifications ........................................................................... 39

11.1 Technical specifications DKL8 ............................................................ 39 11.2 Technical specifications DKL12 .......................................................... 40 11.3 Technical specifications DKL20 .......................................................... 41 11.4 Technical specifications DKL42/26 ..................................................... 42

12. Wiring diagram ........................................................................................ 43 13. Warranty .................................................................................................. 45 14. Comments/suggestions ........................................................................... 45


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1. Introduction

VELP digestion/mineralization units are designed for various applications from the determination of nitrogen and protein according to the Kjeldahl method (TKN) in food analysis, to environmental analyses (Chemical Oxygen Demand) and chemical-pharmaceutical applications. Velp Scientifica heating blocks are designed for the wet digestion of liquid or solid samples of up to 15 ml or 5 g in size. The DKL Series includes a wide range of models for the simultaneous digestion of 8, 12, 20 or 42 samples using test tubes of various dimensions: DKL 8 (8 x 250 ml), DKL 12 (12 x 250 / 400 ml), DKL 20 (20 x 250 ml), DKL 42/26 (42 x 100 ml). The digestion time depends on the type of sample and the method used. The temperature range varies from 10 to 450°C, ideal for all types of standard digestion as well as for the Kjeldahl method. The compact design of the instrument saves valuable laboratory bench space. With Velp Scientifica digesters, working conditions are totally reproducible and safe as well as reducing the consumption of reactives and saving time thanks to faster heating. The low power consumption reduces the cost of each analysis and limits emissions of CO2 into the environment.


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1.1 Parts included

Check to make sure the digester system is complete after unpacking. Identify the parts included in the supply of the model ordered and check to make sure that all the components listed in the relative column are present. The various components are packed individually.

DKL8

Fully automatic digestion unit

DKL12 Fully automatic digestion unit

DKL20 Fully automatic digestion unit

DKL42/26 Fully automatic digestion unit

S30100200 S30110200

S30100190 S30110190

S30100210 S30100180

Digester1

F30100200 F30110200

F30100190 F30110190

F30100210

F30100180

Lift

A00000170

A00000176

A00000167

A00000167

Sample rack A00000173

A00000172

A00000168

A00000180

Suction cap and drip tray

A00000175

A00000174

A00000169

A00000179

Box of test tubes

A00000144

N°3 pz

A00000144

N°4 pz

A00000144

N°7 pz

A00000146

N°7 pz

The DKL digester1 and the operating manual are packed together. NOTE: Keep the special shock-resistant packing material for future use.


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1.2 Instrument description

1 Mains switch

2 Graphic display

3 Control panel

4 Heating block

5 Sample rack

6 Suction cap

7 Lift

8 Test tubes

The DKL uses innovative techniques and state-of-the-art technology:

The structure of the digester is manufactured from stainless steel with a protective coating of special resins and paints studied and tested to ensure a high resistance to chemical and mechanical agents.

The heating block is manufactured from an aluminium alloy which ensures excellent temperature homogeneity at all temperature settings resulting in complete and homogeneous digestion and a high level of reliability.

The heating block temperature is controlled by a microprocessor with PID logic. The temperature probe is a Pt100 platinum probe which carries out self-calibration each time the unit is turned-on. This ensures the high precision and reproducibility of tests.

The user interface has an innovative graphic display and multi-functional keys, is quick and easy to use and guides the user during programming as well as monitoring the various stages of the digestion process.

4

7

5

3

1

6

8

2


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The innovative electronics with rewritable microprocessor makes it possible to update the software with new versions or new languages simply by downloading the upgrade from a PC via USB connection.

The automatic handling of samples in and out of the heating block including lifting for cooling, offers increased user-safety thanks to the absence of manual activities.

The instrument is protected against overheating by a thermostat with manual reset. A probe located on the heating block cuts off the power supply when a temperature of more than 500°C is detected. The manual reset button is located on the bottom of the instrument (identified by a label marked “SAFETY THERMOSTAT”).

The Program menu contains up to 54 work programs including 30 presets. For each work program it is possible to select up to four ramps (4 temperatures with the relative time of permanence). Temperature settings ranging from 10°C to 450°C can be selected and the time of permanence at the selected temperature can be set within a range of 1 to 999 minutes. The Print menu can be used to enter data relative to the test or tests in progress which can then be transferred to a computer and stored in accordance with GLP (Good Laboratory Practice). It is therefore possible to save and/or print sample data and test parameters for future reference. The Language menu can be used to choose the language in which information is shown on the display. It is possible to select one of the following five languages: Italian, English, French, Spanish, Russian and Chinese. The Settings menu can be used to choose the unit of measure in which temperature is shown on the display (°Celsius o °Fahrenheit o Kelvin). It is also possible to modify the date and time and to activate or disactivate warning messages. DKL digesters guarantee unmatched savings whist ensuring an extremely high level of reliability. Thanks to the new TEMS™ technology, you will obtain considerable benefits in: Time: rapid heating reduces wasted time Energy: 35% reduction in power consumption (compared to a conventional digester) thus cutting CO2 emissions Money: huge cost reduction per single analysis Space: the narrow footprint saves valuable laboratory bench space


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1.3 Keys and functions

MAINS SWITCH

The mains switch is used to turn the instrument on and off. In the position marked I the green light indicates that the instrument has been turned on.

CONTROL PANEL

The control panel has a graphic display and 4 multi-functional keys offering easy access to the instrument’s various functions and offering guided operator support during programming and standard use. Each window that appears on the display gives a description of the function carried out by each key. In this way it’s possible access to the 6 main menus.

The START and STOP keys can also be found on the control panel.

Use the START key to start the program selected. Use the STOP key to:

stops the work-cycle

return to the main menu.


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2. Assemby and installation

2.1 Assembly

Place the instrument on a clean, level and non-flammable surface.

Turn the digester so that the back of the instrument is facing you and begin

installing the lift.

Remove the 4 screws on the rear casing (1).

Position the lift against the instrument aligning the 4 holes with the 4 points of attachment (1).

Use the previously removed screws to fix the lift to the instrument (1).

Connect the lift cable to the relative socket labelled LIFT at the back of the instrument (2). This socket is isolated from the live parts by double insulation.

Turn the digester so that the control panel faces you.

Place the sample rack on the lift using the appropriate hooks (3).

Remove the drip tray from the suction cup.

Place the suction cup on the lift using the appropriate hooks (4) and be sure that the glass parts of suction cup are correctly aligned with test tube/sample rack.

Position the instrument at a distance of at least 15cm from any walls. NOTA: Always remove the lift before moving the DKL.

1

2

4

3


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2.2 Hydraulic connections

Connect the viton tube 10x14 (supplied with the SMS Scrubber), to the pipe union on the left-hand side of the suction cup.

NOTE For applications where the digestion process produces fumes, acid gases or corrosive substances (e.g. the Kjeldahl method), specific accessories are required as well as fumes suction and abatement systems. Velp Scientifica offers the following systems: JP recirculating water pump for fumes aspiration (code F30620198) SMS Scrubber (cod. F307C0199) Failure to use the abovementioned instruments and accessories in these applications will result in the warranty becoming void. Diagram showing how to connect the various instruments:

JP Jet pump SMS Scrubber DKL Digester

When using the DKL 42/26 digester, Velp recommends the use of 2 JP pumps in order to guarantee efficient fumes removal (see the connection scheme below).

JP Jet pump JP Jet pump SMS Scrubber DKL Digester


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2.3 Electrical connection

Before connecting the unit to the power supply make sure that the mains switch is in the OFF position “0” and check that the values on the rating plate of the unit correspond to those of the power supply. Make sure that the mains circuit is earthed. Connect the unit to the power supply using the earthed cable supplied, the socket should be easily accessible. NOTE: When the mains switch is turned off the unit is completely disconnected from the mains circuit avoiding any waste when the unit is not in use.


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3. Operating controls

3.1 Quick guide

This page shows the software of the heating block. The purpose is to help the user identify the different possibilities offered by the instrument and how to reach them easily.


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3.2 Main menu

When the instrument is turned on, the display shows the name of the manufacturer and the software version installed for a few seconds.

The standard window is then displayed:

The first line shows the model of DKL (top left) and the date/time (top right). The second line shows the name of the last program used. The center of the display shows the temperature of the heating block and the ramp settings of the program.

To start the work-cycle press key .

The ▼ and ▲ keys (bottom left) move the Lift up and down.

When the Lift is active, the display shows “Attention Lift Movement”. Be careful with moving parts.

NOTE: If the Lift cable is not connected to the Digester, the keys ▼ and ▲ are not visible.

The Menu key gives access to other functions (main menu).


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The "Main Menu" offers the following sub-menus that can be selected using the ▼ and ▲ keys:

Press OK to access the sub-menu and Exit to return to the standard window.


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3.3 Program menu

The "program menu" offers a variety of programs using standard methods as well as a number of programs that can be used to create personalized methods for specific requirements.

3.3.1 Program selection

Press OK to access the Program menu:

Press OK to access “Standard methods” offering 30 standard programs that cannot be edited, or “Personal methods” offering 24 customizable programs. The checkmark indicates the program selected.

Press OK to confirm:

The display shows the parameters of the 4 ramps. Press Confirm to confirm and access the standard window to start the work-cycle. If a customizable program has been selected, press Edit to modify the ramp parameters.


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3.3.2 Parameter settings

To create a customized method, press Edit to access the "Edit Method" screen:

Select "Program Name" and press the Edit button. Use the alphanumeric keyboard to assign a name to the program in question.

Use the ◄ and ► keys to move the cursor and OK to confirm the letter selected. You can enter up to 14 digits for each data field. Press Save/Exit to save the changes and return to the previous menu.

Confirm the program name by pressing Yes. Select "1st ramp" from the "Edit method" screen using the ▼ and ▲ keys. Press Edit to confirm.

Use the + and – keys to increase or decrease the temperature value (keep pressed for fast run). Press OK to confirm, the cursor will automatically move to the Time value which can be modified in the same way.

Press Save/Exit followed by Yes from the “Confirm action” window, to save the modification and to return to the previous menu.


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3.4 Print menu

The instrument has a USB connection on the rear panel that can be used for transferring and storing data according to Good Laboratory Practice (G.L.P.). The Print menu allows the user to choose whether to transfer data automatically at the end of each work-cycle or only when requested. This menu also allows the user to enter and store data concerning the sample examined and the parameters used for each test. Press Exit to return to the previous menu.

3.4.1 Print data

It is possible to transfer the data referring to the method selected to a HyperTerminal using the PC UBS interface settings. Select "Print Data" using the ▼ and ▲ keys and press OK to confirm. Press Exit to return to the previous menu.

3.4.2 Data settings

Use this option to enter the test parameters that will be saved on file. Select “Set up data” and press OK to confirm.


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Select the parameter to be modified and press OK. Use the alphanumeric keyboard to modify the parameter selected.

Use the ◄ and ► keys to move the cursor and OK to confirm the letter selected. You can enter up to 14 digits for each data field. Press Save/Exit to save the changes and return to the previous menu.

3.4.3 Print options

Use this option to modify the settings for data transmission. Select “Print options” and press OK to confirm.

Use ◄ and ► to select automatic data transmission of data at the end of each digestion. For manual data transmission select "Print data". Press OK to confirm or Exit to return to the previous menu without saving the modification.


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3.4.4 PC USB interface settings

Test data can be transmitted and stored on a PC by connecting it to the USB socket labeled USB at the back of the digester (this socket is isolated from the live parts by double insulation). The Hyper Terminal program installed in Microsoft Windows 95 – 98 -2000 – XP - Vista and Windows 7 software can be used with the digester connected to a PC. Use the following PC serial connection settings:

Baud rate 19200 Data length 8 Parity None Bit of Stop 1 Handshaking None

PC Connection: Use a standard USB cable type A/B. In case of problems of connection between instrument and PC, we recommend to download the updated driver FTDI from the manufacturer website: http://www.ftdichip.com/Drivers/VCP.htm

3.4.5 Data transmission file

The file contains the following information: VELP SCIENTIFICA Digester: DKL20 Software Version: 1.0.0

Default report heading

Program: 31 - Milk Program in use Date (dd/mm/yy): 19/12/00 Time (hh.mm): 14.53

Data settable in the menu Set up \ Data setting

Laboratory name: Analytical Department Operator name: Velp Scientifica Sample name: Milk powder Lot number: 123456

Data entered using the Print \ Data setting menu

Set 1: 150 °C Time 1: 60 min Set 2: 250 °C Time 2: 60 min Set 3: 350 °C Time 3: 60 min Set 4: 420 °C Time 4: 60 min

Parameters selected for the program in use

http://www.ftdichip.com/Drivers/VCP.htm


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3.5 Language menu

Select “Language” and press OK to confirm. The menu offers a choice of six languanges: Italian, English, French, Spanish Russian and Chinese (for more information, see paragraph 3.5.1). Use ▼ and ▲ to select the language and press OK to confirm.

The language currently selected is indicated by the checkmark √.

Press Exit to return to the previous menu. NOTE: The alphanumeric keypad usess the Roman alphabet for all languages.

3.5.1 Add languages

Additional languages can be installed: Arabic, Portuguese, German, Turkish, Japanese, Polish, Vietnamese, Korean and Thai. For more information see paragraph 3.8.1

3.6 Settings menu

In this menu is possible change various parameters of the digester.


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3.6.1 Date

Select “Set up date” and press OK to confirm.

Use + and - to increase or decrease the field highlighted. Press OK to confirm, the next field will automatically be highlighted. Press Save/Exit to save the changes and return to the previous menu.

3.6.2 Time

Select “Set up time” and press OK to confirm.

Use + and - to increase or decrease the field highlighted. Press OK to confirm, the next field will automatically be highlighted. Press Save/Exit to save the changes and return to the previous menu.


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3.6.3 Unit of measure

Select “Setup unit” and press OK to confirm.

Use ◄ and ► to select the unit of measure for temperature readings °C (Celsius), °F (Fahrenheit) or K (Kelvin) by ◄ and ►. Press OK to confirm Press Exit to return to the previous menu. NOTA: The numerical range for temperature settings varies according to the unit of measure. °Celsius: from 10°C to 450°C °Fahrenheit: from 51°F to 392°F Kelvin: from 283 K to 723 K If the unit of measure is modified the instrument automatically changes the set point temperatures in the various work programs.

3.6.4 Contrast

Select “Set Contrast” and press OK to confirm.


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Use ◄ and ► to adjust the contrast (from 10% to 90%). Press OK to confirm. Press Exit to return to the previous menu.

3.6.5 Keyboard sound

Select “Keyboard sounds” and press OK to confirm.

Use ◄ and ► to enable or disable the sound function (On / Off) when a key is pressed. Press OK to confirm. Press Exit to return to the previous menu.

3.6.6 Acoustic signal

Select “Acoustic signal” and press OK to confirm.


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Use ◄ and ► to enable or disable (On or Off) the acoustic signal when an alarm is activated. Press OK to confirm. Press Exit to return to the previous menu.

3.6.7 Blackout alert

Select “Blackout alert” and press OK to confirm. This function can be used to record the duration of the power failure in order to assess the possibility of continuing the analysis (see section 5). If this option is turned off, the work-cycle will automatically be continued after a power failure.

Use ◄ and ► to enable or disable this function (On / Off). Press OK to confirm. Press Exit to return to the previous menu.

3.6.8 Automatic Lift

Select “Automatic Lift” and press OK to confirm. If this function is disabled the Lift must be moved up and down manually by the operator using ▲ and ▼. With the function enabled lift movement is controlled automatically by the digester at the beginning and end of each analysis.


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Use ◄ and ► to enable or disable this function (On / Off). Press OK to confirm. Press Exit to return to the previous menu.

3.6.9 Drip tray alert

Select “Drip tray alert” and press OK to confirm.

Use ◄ and ► to enable or disable (On or Off) the alert notifying the operator that the drip tray must be removed (this alert is only active with the Lift in the high position). Press OK to confirm. Press Exit to return to the previous menu.

3.7 Instrument information

Select “Instrument information” and press OK to confirm. In this menu is possible view the software version installed on the digester and get the information about the number of tests performed and the movement of Lift.

This page displays information such as the software version installed, the number of tests performed and the Lift movement counter. Press Exit to return to the previous menu.


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3.8 Service menu

Select “Service Menu” and press OK to confirm. From this menu it is possible modify the instrument settings and update the software.

3.8.1 Update software

Select “Update software” and press OK to confirm. The software can be updated via a USB port. Press OK on the confirmation screen and launch the dedicated program from the PC .

Software version, dedicated program to be installed in the PC and software installation guide have to be requested by e-mail to [email protected].

3.8.2 Keyboard Check

Select “Keyboard check” and press OK to confirm . Use to test the function keys on the digester.

mailto:[email protected]


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Press each function key in sequence. If the key is working correctly a checkmark √ will appear. Check each single key before pressing Exit to return to the previous menu.

3.8.3 Lift Check

Select “Lift Check” and press OK to confirm.

Press OK to perform an automatic self-test on the lift. At the end of the test, the result is displayed on the screen.

Press Exit key to return to the previous menu.

4. Start heating

To start the work cycle select the desired program and press the START button from the main menu. The instrument will automatically display the last program used.


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Press to start the program displayed. If the lift is in the up position the following warning message will be displayed (only if the drip tray alert is enabled):

Press a second time and the LIFT will automatically move to the operating position. Digestion starts and the display highlights the first ramp.

NOTE: The symbol indicates that the instrument is heating. When the temperature of the heating block reaches the set temperature, an acoustic signal indicates the start of the set time. The display shows:

Once all the ramps have been performed heating stops and the lift moves to the middle position.


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If during the set time is pressed, the instrument will run continuously at the set temperature and the display shows:

To interrupt the work-cycle press . NOTE: When starting a new program, if the temperature of the heating block is higher than the set temperature the work cycle will not start. In order to start the work cycle wait until the block cools to a temperature lower than the set temperature. NOTE: If you did not use all the positions of the digester, use the accessory A00000243 " Glass cap" for empty positions, placing it in the sample rack.

5. Arrests

5.1 Blackout

In the event of a blackout or power failure, when the power returns the work cycle automatically continues from the point where it left off if the blackout function is disabled. However, if the blackout function is active, a warning message indicates the duration of the power failure and the operator can decide whether to continue the analysis or not.


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5.2 Faulty probe

If the probe measuring the temperature of the heating element is faulty, the following warning message is displayed:

NOTE: In this state it is only possible to move the Lift.

5.3 Overheating

If the temperature of the heating is too high, the following warning message is displayed and the work-cycle is automatically interrupted.

NOTE: Before starting a new analysis, allow the heating block to cool down. If the instrument no longer heats-up, see paragraph 7.2.

6. End-of-work operations

At the end of each test it is good practise to place the drip tray in its’ seat to prevent any liquid dripping onto the heating block. Before cleaning the instrument, disconnect it from the power supply by removing the plug and make sure that the heating block is cool. Clean the unit with soft cloth and a non-flammable, mild detergent. NOTA: To keep the instrument in optimum condition, any drops of acid that drip onto any of the surfaces should be removed immediately.


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7. Maintenance

Routine maintenance and extraordinary maintenance are not necessary with the exception of periodically cleaning the instrument as described in the previous paragraph. The instrument must be transported in its original packaging and any indications present on the original packaging must be followed (e.g. palletised).

7.1 Replacing the fuses

Replace the fuses only when necessary, i.e. if the unit doesn’t turn on and the mains switch does not light up. The fuses must only be replaced by qualified personnel and only with fuses supplied by Velp. To replace the fuses is needed: - unplug the unit; - locate the fuse holders at the back of the instrument; - unscrew the fuse caps.

7.2 Rearming the safety thermostat

If the display is on but the heating block does not heat-up, check to see if the safety thermostat has tripped cutting-off the power supply to the resistance. The safety thermostat trips if a temperature of higher than 500°C is detected. The manual reset button is located on the bottom of the instrument (identified by the label SAFETY THERMOSTAT).

7.3 Lubrication of the guide

If the sample rack or the suction cap move hard, set the lift in the top position and lubrificate the guide with a dry spray lubricant (es. SVITOL TECHNIK - DRY) to limit the friction. During this operation mind the sensors on the topside of the guide.

8. Disposing of the unit

The instrument is classified as electrical/electronic apparatus and must be disposed of accordingly. The unit is subject to waste separation and cannot be disposed of as urban waste under EEC directive 2002/96/CE. For more information please contact the relative division of your local town council.


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9. Accessories available on request

9.1 Accessories available for analysis

Description Code for

DKL8 Code for DKL12

Code for DKL20

Code for DKL42/26

Sample rack

A00000173

A00000172

A00000168

A00000180

Stand for sample rack

A00000184

A00000183

A00000182

A00000182

Test tubes Ø 42x300 mm, 250ml 3pcs/box

A00000144

A00000144

A00000144

-

Test tubes Ø 26x300 mm, 100ml 6pcs/box

- - -

A00000146

USB cable 1,8mt

10003134

10003134

10003134

10003134

IQ/OQ Manual


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To perform the analysis with 400ml test tubes you will need:

Description Code for

DKL8 Code for DKL12

Code for DKL20

Code for DKL42/26

Test tube Ø 50x300mm, 400ml

-

A00000185

A00000185

-

Sample rack -

A00000181

A00000246

-

Glassware handle for COD

A00000237

Test tube COD Ø42x200mm 200ml 3pcs/box

A00000145

Air refrigerators with ground cone

A00001041

Antisplash bell

A00001045

PTFE sheaths for 29/32 cones

A00001042

Glass cap A00000243

A00000243

A00000243

A00000243


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9.2 Accessories for testing the heating block temperature

The Digester has a built-in electronic temperature control system resulting in excellent temperature control without over-heating and without temperature oscillations near the set point. The PT 100 temperature probe on the heating block ensures excellent precision. The probe is calibrated automatically each time the unit is switched on thanks to the microprocessor software, therefore temperature alignment is not necessary. Should it be necessary to check the temperature readings of the instrument, this can be done by placing an original Velp Scientifica thermometer in the hole on the top of the heating block. Before proceeding with the control sure you have removed the sample rack and the suction cup.

Graduated mercury thermometer 0250°C Code 10000282


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10. Spare parts

Description Code

Retarded fuse 6,3x32mm 8A 10000675

Retarded fuse 6,3x32mm 15A 10006304

Half washer for suction cup 10004366

Washer for DK42/26 cap 10004690

Ramp DKL20 10004358

Single ramp DKL12 10004664

Ramp DKL12 10004658

Ramp DKL8 10004713

Ramp DKL42/26 10004680

Ramp manifold DKL20 10004359

Ramp manifold DKL12 10004669

Ramp manifold DKL42/26 10004689

Drip tray for DKL20, DKL42/26 40001497

Drip tray for DKL12 40001576

Drip tray for DKL8 40001564

Plug diam. 13,6 10004252


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11. Technical specifications

11.1 Technical specifications DKL8

GENERAL

Power supply (alternating current) V/Hz 230~(+/- 10%)/50-60 (F30100200) V/Hz 115~(+/- 10%)/50-60 (F30110200) Total power W 1150 Heating unit power W 1050 Dimensions (B x H x P) mm 205x136x516 inch 8,1x5,4x20,3 Weight kg 8,9 lb 19,6 Number of positions 8 Display Graphic LCD Display interface languages UK – I – E – F – RUS - CN Unit of measure for temp. readings °C o °F o K Type of temperature control P.I.D. Temperature probe Pt100 class A Pollution degree 2 Overvoltage category II Max. altitude m 4000 Max. humidity % Max 85 Storage temperature °C -10 ….+60 °F +14…+140 Working environment temperature °C +5 …..+40 °F +41 …+104 Fuses 6,3x32 A 8 (F30100200) A 15 (F30110200) Max weight sample+reagents/test tube g 70 lb 0,15 TEMPERATURE CONTROL Stability of heating block temperature °C ± 0,5 Precision of heating block temperature °C ± 0,5 FEATURES

Temperature setting range °C 10÷450 °F 51÷842 Resolution of temperature settings °C 1 °F 1 Resolution of temperature readings °C 1 °F 1 Time settings min. 1÷999 or ∞ Set-point signal Visual/acoustic Countdown Visual Black out Visual SAFETY FEATURES

Faulty probe warning Visual Overheating Heating block thermostat at 500°C with manual reset. Moving lift Visual/acoustic Hot surface Visual (if T>50 °C)


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GENERAL

Power supply (alternating current) V/Hz 230~(+/- 10%)/50-60 (F30100190) V/Hz 115~(+/- 10%)/50-60 (F30110190) Total power W 1500 Heating unit power W 1400 Dimensions (B x H x P) mm 260x136x516 inch 10,2x5,4x20,3 Weight kg 10,7 lb 23,7 Number of positions 12 Display Graphic LCD Display interface languages UK – I – E – F – RUS - CN Unit of measure for temp. readings °C o °F o K Type of temperature control P.I.D. Temperature probe Pt100 class A Pollution degree 2 Overvoltage category II Max. altitude m 4000 Max. humidity % Max 85 Storage temperature °C -10 ….+60 °F +14 …+140 Working environment temperature °C +5 …..+40 °F +41 …+104 Fuses 6,3x32 A 8 Max weight sample+reagents/test tube g 70 lb 0,15 Max weight sample+reagents/test tube (400ml) g 160 lb 0,37 TEMPERATURE CONTROL Stability of heating block temperature °C ± 0,5 Precision of heating block temperature °C ± 0,5 FEATURES


Faulty probe warning Visual Overheating Heating block thermostat at 500°C with manual reset. Working lift Visual/acoustic Hot surface Visual (if T>50 °C)


10004701/B4 41


GENERAL

Power supply (alternating current) V/Hz 230~(+/- 10%)/50-60 (F30100210) Total power W 2300 Heating unit power W 2200 Dimensions (B x H x P) mm 316x136x556 inch 12,4x5,4x21,9 Weight kg 15,7 lb 34,6 Number of positions 20 Display Graphic LCD Display interface languages UK – I – E – F – RUS - CN Unit of measure for temp. readings °C o °F o K Type of temperature control P.I.D. Temperature probe Pt100 class A Pollution degree 2 Overvoltage category II Max. altitude m 4000 Max. humidity % Max 85 Storage temperature °C -10 ….+60 °F +14 …+140 Working environment temperature °C +5 …..+40 °F +41 …+104 Fuses 6,3x32 A 15 Max weight sample+reagents/test tube g 70 lb 0,15 TEMPERATURE CONTROL Stability of heating block temperature °C ± 0,5 Precision of heating block temperature °C ± 0,5 FEATURES




10004701/B4 42

11.4 Technical specifications DKL42/26

GENERAL

Power supply (alternating current) V/Hz 230~(+/- 10%)/50-60 (F30100180) Total power W 2300 Heating unit power W 2200 Dimensions (B x H x P) mm 316x136x556 inch 12,4x5,4x21,9 Weight kg 17,6 lb 38,8 Number of positions 24 Display Graphic LCD Display interface languages UK – I – E – F – RUS - CN Unit of measure for temp. readings °C o °F o K Type of temperature control P.I.D. Temperature probe Pt100 class A Pollution degree 2 Overvoltage category II Max. altitude m 4000 Max. humidity % Max 85 Storage temperature °C -10 ….+60 °F +14 …+140 Working environment temperature °C +5 …..+40 °F +41 …+104 Fuses 6,3x32 A 15 Max weight sample+reagents/test tube g 15 lb 0,03 TEMPERATURE CONTROL Stability of heating block temperature °C ± 0,5 Precision of heating block temperature °C ± 0,5 FEATURES




10004701/B4 43

12. Wiring diagram

DKL:


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1 Fuse

2 Luminous bipolar switch 3 Electronic board

4 Probe Pt100 5 USB board

6 Female connector 8 poles

7 Triac 8 Heating element

9 Safety thermostat 500°C 10 Transformer

11 Keyboard

LIFT:

M

1 Electronic sensor board

2 Male connector 8 poles 3 Motor


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13. Warranty

The unit is guaranteed against production defects for 25 months from our invoice date. Warranty claims can be made only if the system has been installed and used as specified on the manual and carried out by qualified service personnel as appointed by VELP Scientifica. In accordance with this guarantee VELP SCIENTIFICA undertakes to repair any units resulting as faulty due to the quality of the materials used or poor workmanship. Units rendered faulty due to inexpert handling/use or carelessness will not be replaced or repaired under warranty. For more details please contact your Distributor. Exclusions: The guarantee will be considered null and void for faults resulting from: - inexperience and carelessness of the operator, - repairs, maintenance or replacement of parts carried out by personnel or

Companies not authorized by the manufacturer, - use of the instrument that does not comply to the instructions/recommendations

given in the present operating manual, - use of non-original spare parts.

14. Comments/suggestions

We will be pleased to receive any comments and/or suggestions that will help us to improve this operating manual.

e-mail: [email protected]


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Declaration of conformity

We the manufacturer VELP SCIENTIFICA s.r.l. Address Via Stazione, 16 20865 USMATE (MB) Italy under our responsibility declare that the product is manufactured in conformity with the following standards: EN 61010-1 (2001) EN 61326-1 (2006) EN 61010-2-010: 2003 2011/65/EU (RoHS) 2002/96/EC (WEEE) and satisfies the essential requirements of the following directives: Machinery directive 2006/42/EC Low voltage directive 2006/95/EC Electromagnetic compatibility directive 2004/108/EC plus modifications and that the documents listed in annex I are available at Velp's offices as foreseen by the machinery directive.

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10004701/B4

Thank you for having chosen a VELP product !

Since 1983 Velp has offered to professionals in the sector a range of sophisticated and reliable equipment with excellent operating capacity and backed by high levels of know-how at competitive prices. Velp works according to ISO 9001, ISO14001 and OHSAS 18001 Quality System Certification. Instruments are built according to the International norms IEC 1010-1 and to the rules of the CE mark. Let us present our product Lines:

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