DENTAURUM desktopCompact 090-578-50 User manual

Instructions for use
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More than 20 years of Dentaurum laser welding technology.
M
M
Turnstr. 31 I 75228 Ispringen I Germany I Phone + 49 72 31 / 803 - 0 I Fax + 49 72 31 / 803 - 295
www.dentaurum.com I [email protected]

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Contents
1. General information .............................................................................................................................. 3
2. Safety information ................................................................................................................................ 4
2.1 Symbols and information .......................................................................................................................... 4
2.2 Intended use............................................................................................................................................. 4
2.3 Warranty and liability................................................................................................................................ 4
2.4 Employer‘s obligations .............................................................................................................................. 5
2.5 Personnel‘s obligations ............................................................................................................................. 5
2.6 Laser safety officers .................................................................................................................................. 5
2.7 Protection of the eyes against laser radiation ............................................................................................ 6
2.8 Protection of the skin against laser radiation ............................................................................................. 7
2.9 Further important safety issues, welding fume extraction .......................................................................... 8
2.10 Service and maintenance .......................................................................................................................... 8
2.11 Laser warning signs .................................................................................................................................. 9
2.12 Location of laser warning signs ............................................................................................................... 10
3. Basics of the laser and the welding process...................................................................................... 11
4. Machine description ............................................................................................................................ 12
4.1 Overview ................................................................................................................................................ 12
4.2 The working chamber............................................................................................................................. 14
4.3 Design of the desktop Compact.............................................................................................................. 15
4.4 External connections............................................................................................................................... 16
4.5 Installation and commissioning ............................................................................................................... 17
4.6 Operating the desktop Compact............................................................................................................. 18
5. The stereo microscope......................................................................................................................... 20
6. Setting the pulse parameters ............................................................................................................. 22
7. Operating the touchscreen / working chamber ................................................................................ 25
7.1 Setting pulse parameters on the touchscreen.......................................................................................... 25
7.2 Opening/closing safety shutter on touchscreen ....................................................................................... 26
7.3 Saving/loading parameter sets on touchscreen or in working chamber.................................................... 26
7.4 Resetting error message on touchscreen ................................................................................................. 28
7.5 Displaying and modifying basic settings on touchscreen.......................................................................... 29

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8. Welding ................................................................................................................................................ 30
9. Turning off the system ........................................................................................................................ 30
10. Maintenance information ................................................................................................................... 31
10.1 Checklists 1, 2 and 3 .............................................................................................................................. 32
10.2 Testing laser adjustment and beam path ................................................................................................. 33
10.3 Changing the lens protective glass.......................................................................................................... 33
10.4 Checking and replacing the filter for welding fumes ............................................................................... 34
10.5 Opening the desktop Compact ............................................................................................................... 35
10.6 Changing cooling water and particle filter .............................................................................................. 36
10.7 Adjusting the laser welding spot on the reticule in the stereo microscope ............................................... 37
11. Possible faults, causes and elimination.............................................................................................. 38
12. Spare parts list ..................................................................................................................................... 42
13. Environment and disposal .................................................................................................................. 42
14. Technical data....................................................................................................................................... 43
15. EC declaration of conformity .............................................................................................................. 44
16. Confirmation of instruction ................................................................................................................ 45
17. Annex

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1. General information
Thank you for choosing the Dentaurum laser welding unit. In order to enjoy your new laser welding unit for a long
time, please observe all the information in these Instructions for use. According to EC guidelines, the Dentaurum
laser welding unit is a piece of work equipment. It has been developed specifically for use in the dental laboratory.
Unit identification
Make: Laser welding unit (Nd: YAG laser wavelength 1064 nm)
Type: desktop Compact – REF 090-578-50
Company name: Dentaurum GmbH & Co. KG
Turnstr. 31
75228 Ispringen
Germany
The parts to be welded are manually arranged, positioned and laser-welded under a stereo microscope in the
welding chamber.
The required shielding gas and the laser pulse are switched on or activated via a two-stage foot switch. During and
after the processing, the welding fumes are automatically extracted.
mCaution: The unit must be installed and put into operation by authorized, qualified personnel or
Dentaurum service technicians.
Before switching on the unit, you must read and understand the Instructions for use.
Only then switch on the unit!
Before using the unit for the first time, the relevant (industrial) authorities must be
informed.

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2. Safety information
2.1 Symbols and information
The following symbols indicating danger are used in the Instructions for use:
mWarning: Indication of a possible threat to the life and health of persons. Failure to observe this information
can lead to serious health effects, including life-threatening injuries.
mCaution: Indication of a potentially dangerous situation.
Failure to observe this information may result in minor injuries or damage to property.
2.2 Intended use
The desktop Compact laser is intended exclusively for welding metals. To use it for any other purpose or for
anything beyond this is to use it improperly. Dentaurum is not liable for damages caused by improper use. The
intended use also includes observing all information in these Instructions for use as well as regular inspections and
maintenance work.
mCaution: The processing of non-metallic materials, in particular the processing of plastics, consti-
tutes improper use.
2.3 Warranty and liability
Our general terms and conditions of sale and delivery apply. Warranty and liability claims in respect of injury or
damage to persons and property are excluded if they are caused by one or more of the following:
· Improper putting into operation, operating, mounting and maintenance of the laser
· Improper use of the laser
· Operating the laser with safety facilities that are defective or improperly installed or with inoperable safety and
protective precautions
· Failure to observe the information in the Instructions for use regarding transport, storage, installation, operation
and maintenance of the laser
· Lack of monitoring of wear parts
· Unauthorized structural modifications to the laser, in particular to the safety devices
· Improperly performed repairs.

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2.4 Employer‘s obligations
The employer is obliged to only allow personnel to work with this unit who
· are familiar with the regulations on occupational safety and accident prevention and are instructed in the handling
of the unit
· have read and understood the safety instructions and Instructions for use and have signed confirmation of this
(see chapter Confirmation of instruction)
· have been instructed in accordance with the regulations on accident prevention for laser radiation, and the
regulations of the trade associations, as valid in the country of operation
· Before using the unit for the first time, the relevant authorities for industrial safety (e.g. labor inspectorate)
must be informed.
2.5 Personnel's obligations
Before starting to work, all personnel who work with the unit must
· observe the basic regulations on occupational safety
· read and understand the safety instructions and Instructions for use and confirm this with their signature
(Confirmation of instruction).
2.6 Laser safety officers
For the use of a Class 4 laser, a competent laser safety officer must be appointed in writing by the employer. The
laser safety officer should have training and experience in the field of laser radiation. The laser safety officer should
fully understand the safety procedures and equipment used. He is responsible for the safe operation and the safety
measures of the unit.

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2.7 Protection of the eyes against laser radiation
The unit is equipped with measures to protect the eyes of the operator and other personnel in the vicinity of the
unit.
Safety shutter
The safety shutter prevents the generation of laser pulses or the unintended emission of laser radiation from the
laser beam source and closes
· if the feed flap is open
· if the laser parameters are changed
· if there is no control voltage at the safety shutter.
The laser pulse is only operational
when the feed flap is closed
· and no laser parameters are set
· and the recharging of the energy reservoir has finished
· and the foot switch has been pressed down to level 2.
Other eye protection devices
· The unit has a large observation window made from a laser protection polymer for safe and direct observation
of the welding process
· The unit has an automatic glare protection in the beam path of the stereo microscope, which is activated during
welding
· The entire laser beam path is optically sealed to the outside.
The unit fulfills all stipulations for total eye protection!
This fulfils part of the stipulations of a Class I laser.
The unit does not fulfill the second part of the stipulations for a class I laser, i.e. protection of the skin against
laser radiation.

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2.8 Protection of the skin against laser radiation
The unit has been developed for dental applications. The working process cannot be automated because each
workpiece represents an individual piece. The dental workpiece must be held with your hands , as a large number
of various materials with different measurements, shapes, surface qualities and fitting tolerances are connected
together in various combinations or have to be processed at their surfaces. At the moment protective gloves
against laser radiation technically cannot be realized and would hinder or even make it impossible to work on
the very small parts. The same problem exists for the use of holders, tweezers, etc. Therefore this laser has to be
classified as work equipment for the dental laboratory that bears the threat of minor injuries.
Due to the design of the unit, the area of danger is limited to the operator's hands and arms only. In case of false
operation the tissue of the skin can be slightly burned by laser exposure. In case of severe burns the operator
should seek medical treatment.
mCaution: Invisible laser radiation!
To avoid direct laser radiation to your hands:
· Do not hold your hands directly under the reticule and thus in the laser beam.
· Look through the stereo microscope and position the workpiece so that the welding point appears sharp within
the reticule.
· Take care that the hands do not appear – if possible – in the field of view of the stereo microscope!
· Keep your hands calm while releasing the laser pulse with the two-stage foot switch!
· Look frequently through the stereo microscope and control the position of your hands and the position of the
workpiece.
mCaution: Scattered laser radiation
To avoid scattered laser radiation to your hands:
Especially objects with shiny surfaces can scatter or deflect the laser radiation so that even at longer distances from
the welding point there is a certain local danger of burning.
If possible, do not wear any jewelry on your arms and fingers while working with laser radiation and do not hold
any shiny surfaces directly into the laser beam.

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2.9 Further important safety issues, welding fume extraction
· The instructions must always be kept with the unit
· This unit is designed to weld dental metals and alloys using a pulsed laser beam; it must not be used for any other
purposes
· Never place flammable or explosive substances into the welding chamber
· During the welding procedure, health endangering vapors may be produced
Therefore, in order to maintain clean breathable air, trade associations recommend the use of a suitable welding
fume extractor during welding work with the laser.
The extraction unit, integrated in the desktop Compact is only permitted to extract laser welding fumes.
It must not be used for other purposes, such as the extraction of
· highly flammable or explosive gases
· liquids of any kind
· organic substances (e.g. plastics)
The vent slots for intake and exhaust air (see Figure 2 on page 12) must always be kept clear. The welding fume
extractor must only be operated with the original spare filter and never without a filter.
Emergency off button
The emergency off button is located to the right of the touchscreen (see Figure 2 on page 12). If a dangerous
situation should occur, the desktop Compact laser can be switched off by pressing hard against this button.
To restart, turn the switch in the direction of the arrow; it will automatically jump back into place.
Electrical safety

The desktop Compact laser is driven by AC voltage 1-phase, 200 - 240 V / 50 - 60 Hz, 10 A. In the laser unit,
there are voltages of up to 400 V.
The unit must only be operated with a three-conductor mains cable with integrated protective conductor.
To avoid a short circuit, only deionized cooling water with a conductivity < 2.5 µS / cm may be used.
mCaution: Make sure the mains plug is removed before opening the device.
2.10Service and maintenance
mCaution: Never work alone when carrying out service or maintenance activities!
Various work on electrical parts, optical components and structure of the machine
may only be carried out by authorized, qualified personnel or by the Dentaurum service
technicians.
A second person, who should be familiar with the risks posed by laser radiation and high-voltage, should always
be present during service and repair activities.
mWarning: Life-threatening high voltage!
To ignite the flash lamp, this laser runs with high-voltage capacitors. Therefore, after having turned off or dis-
connected the device, current-carrying components could still be live.

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2.11 Laser warning signs

Invisible laser radiation
Avoid eye or skin exposure
to direct or scattered radiation
Laser Class 4
Avoid exposure to radiation
Emission of invisible laser radiation
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