35,0(6Operating Manual
Translation of the Original Instructions

Flat Absorber with water-cooling
NIR or CO2

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1

Basic Safety Instructions

42

Symbol Explanation

63

Install/remove the Flat Absorber

743.1

Install the Flat Absorber........................................................................... 73.2

Remove the Flat Absorber....................................................................... 8Connect the water supply

94.1

Water quality............................................................................................ 94.2

Connect the water supply...................................................................... 105Operation

116Dimensions

127Technical Data

138Product Disposal

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Basic Safety Instructions

Intended Use
The Flat Absorber is intended for installtion and permanent integration into a lasersystem. The Flat Absorber converts the radiation of NIR or CO2-lasers into heat, whichis then dissipated into the cooling water that is flowing through. Please observe andadhere to the specifications and limit values given in Chapter 3 „Install/remove the FlatAbsorber“ on Page 7. Forms of use, other than the intended use described herein,
are considered improper. For the safe use of the Flat Absorber, the information in thisoperating manual must be adhered to.
Using the Flat Absorber for use other than that described in this operating manual isprohibited strictly by the manufacturer. By usage other than intended, the Flat Absorbercan be damaged or destroyed. This poses an increased health hazard up to and including fatal injuries. When operating the Flat Absorber, it must be ensured that there areno potential human health hazards.
The Flat Absorber does not ensure complete absorption of the laser radiation. Pleasekeep in mind that there is a residual reflection (typically 3 % to 4 %). Please observe
that, even with the use of the Flat Absorber, scattered radiation (laser class 4) can arise. Hence, the applicable safety regulations are to be observed and necessary protective measures must be taken.
Observing Applicable Safety Regulations
Personal protective equipment (PPE) is required when humans are present in a hazardous zone with uncovered visible or invisible laser radiation or particularly uncovered
laser beam systems, beam guidance systems or processing areas. This holds true forany application of this equipment. During measurement procedures there is always an
unavoidable risk of laser radiation through direct or reflected emissions. The applicablesafety regulations are stipulated in ISO/CEN/TR standards as well as in the IEC-608251 regulation, in ANSI Z 136 “Laser Safety Standards” and ANSI Z 136.1 “Safe Use ofLasers”, published by the American National Standards Institute, and additional publications, such as the “Laser Safety Basics”, the “LIA Laser Safety Guide”, the “Guide for
the Selection of Laser Eye Protection” and the “Laser Safety Bulletin”, published by theLaser Institute of America, as well as the “Guide of Control of Laser Hazards” by ACGIH.
Taking Necessary Safety Measures
If there are people present within the danger zone of visible or invisible laser radiation,for example near laser systems that are only partly covered, open beam guidance sys4

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35,0(6tems or laser processing areas, the following safety measures must be taken:•••••••••

Please wear safety goggles adapted to the laser wave-length and operating
mode of the laser beam source in use.
Depending on the laser source, it may be necessary to wear suitable protective
clothing or protective gloves.
Please protect yourself from direct laser radiation, scattered radiation as well asfrom beams generated from laser radiation (e.g. by using appropriate shielding
walls or by attenuating the radiation to a harmless level).
Please use beam guidance- or beam absorber elements which do not emit any
hazardous particles when irradiated with laser radiation and which can withstandthe beam sufficiently.
Please install safety switches and/or emergency safety mechanisms which enable
an immediate closure of the laser shutter.
The Flat Absorber temperature is to be monitored with a temperature sensor.
The cooling water flow rate is to be monitored.
Please ensure a stable installation according to Chapter 3 „Install/remove the Flat
Absorber“ on Page 7) at the designated locations in order to prevent a relative
motion of the Flat Absorber to the beam axis, reducing the risk of scattered ordirectly reflected radiation.
Connect the Flat Absorber to the on-site water supply according to Chapter 4„Connect the water supply“ on Page 9 to ensure sufficient cooling of the FlatAbsorber.

Employing Qualified Personnel
All users of the Flat Absorber must have been trained in the installation and operation of
the Flat Absorber and they need to have a basic knowledge about the work with highpower lasers, beam guidance systems as well as focussing units.
Modifications
The Flat Absorber must not be modified, neither constructionally nor safety-related,without our explicit permission. Modifications of any kind will result in the exclusion ofour liability for resulting damages.
Liability Disclaimer
The manufacturer and the distributor of the Flat Absorber do not claim liability for damages or injuries of any kind resulting from an improper use or handling of the Flat Absorber or the associated software. Neither the manufacturer nor the distributor can be held
liable by the buyer or the user for damages to people, material or financial losses due toa direct or indirect use of the the Flat Absorber.
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Symbol Explanation

The following symbols and signal words indicate possible residual risks:

DANGER
means that death or serious physical injuries will occur if necessary safety
precautions are not taken.

WARNINGmeans that death or serious physical injuries can occur if necessary safety
precautions are not taken.

CAUTIONmeans that a slight physical injury can occur if necessary safety precautions
are not taken.

NOTICEmeans that property damages can occur if necessary safety precautions arenot taken.
Further symbols that are not safety-related:
Here you can find useful information and helpful tips.

X6Call for action

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3Install/remove the Flat Absorber

3.1

Install the Flat Absorber

35,0(6Touching the Flat Absorber with bare hands can lead to contamination of the coatedabsorber surface and to the oxidization of the copper surfaces on the Flat Absorber.
Only touch the Flat Absorber, especially the coated absorber surface, with protective
gloves.

DANGER
Serious eye or skin injury due to laser radiation
If the stability of the Flat Absorber is not guaranteed or if the Flat Absorber is not installed with the coated surface (gray/black area) towards thelaser beam, scattered or directed reflection of the laser beam will result.

1.
2.
3.
4.
•X

Install the Flat Absorber with the coated surface (gray/black area) facing
the laser beam.

X

Install the Flat Absorber in a way that ensures, that the Flat Absorbercan not shift or fall.

To avoid contamination, wear protective gloves.
Align the Flat Absorber with the coated surface towards the laser beam. Observe
the specifications in Chapter 7 „Technical Data“ on Page 13.
Install the Flat Absorber in the 2 threaded holes M4 on the long sides.
Ensure a stable installation of the Flat Absorber:
The Flat Absorber must not be able to move.

Fig. 3.1: Threaded holes M4

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Flat Absorber with water-cooling

Remove the Flat Absorber

The touch of the Flat Absorber with bare hands can lead to contamination of the coatedabsorber surface and to the oxidation of the copper surfaces on the Flat Absorber. Only
touch the Flat Absorber, especially the coated absorber surface, with gloves.
Even when used as intended, parts of the Flat Absorber can become very hot. Temperatures above 70 °C can be reached.

WARNING
Risk of burns – Hot surface
The Flat Absorber is very hot after operation. Touching the hot Flat Absorber can cause severe burns.
X Allow the Flat Absorber to cool for a adequate time before removing it.
Make sure before touching the Flat Absorber that it is no longer hot.
1.
2.

8

To avoid contamination, wear protective gloves.
After cooling down the Flat Absorber unscrew 2 M4 fixing screws on the longsides and remove the Flat Absorber from the laser system.

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4Connect the water supply

4.1

Water quality•••••

35,0(6The water-cooled Flat Absorber is made of copper and can be operated with tap
water as well as demineralized water.
Do not operate the Flat Absorber on a cooling circuit containing additives such as
anti-freeze.
Do not operate the Flat Absorber on a cooling circuit in which aluminum components are installed. Especially when it comes to the operation with high powers
and power densities, it may otherwise lead to corrosion in the cooling circuit. Inthe long term, this reduces the efficiency of the Flat Absorber and the coolingcircuit.
Should the cooling fail, the Flat Absorber can withstand the laser radiation for afew seconds. In this case, please check the Flat Absorber as well as the water
connections for damages and replace them if necessary.
Large dirt particles or teflon tape may block internal cooling circuits. Therefore,
please thoroughly rinse the system before connecting it.

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Flat Absorber with water-cooling

Connect the water supply

The Flat Absorber is pre-fitted with 2 ELSA push-in fittings for hose outer diameters of10 mm.
1.
2.

To avoid contamination, wear protective gloves.
Connect the 2 ELSA push-in fittings with the on-site water supply.

NOTICE
Damaging/Destruction of the Flat Absorber
The water-cooled Flat Absorber is made of copper and can be operated
with tap water as well as demineralized water.

3.
4.
•X

Do not operate the Flat Absorber on a cooling circuit in which aluminumcomponents are installed.

XDo not operate the Flat Absorber without water cooling.

XFor a sufficient cooling of the Flat Absorber, a minimum flow rate of0.7 l/min/kW is required.

XObserve the requirements in Chapter 4.1 „Water quality“ on Page 9.

Activate the on-site water supply.
Check whether the on-site water cooling is in operation:
The Flat Absorber must feel cool to the touch.

Fig. 4.1: 2 ELSA push-in fittings in the G 1/4 inch threaded holes

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535,0(6OperationDANGER
Serious eye or skin injury due to laser radiation
The Flat Absorber does not ensure complete absorption of the laserradiation. Please keep in mind that there is a residual reflection (typically3 % to 4 %).
XObserve the Safety Instructions in Chapter 1 „Basic Safety Instructions“on Page 4.

The Flat Absorber temperature is to be monitored with a temperature sensor.
The cooling water flow rate is to be monitored.

DANGER
Fire hazard due to glowing components
In case of longer irradiation without cooling the Flat Absorber can overheat and start to glow in connection with temperatures of more than
1000 °C.
X

Do not keep flammable materials in the environment of the Flat Absorber.

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Dimensions

All dimensions given in mm

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7

Technical Data
Specifications
Maximum Power Density

1.0 kW/cm²

Maximum Laser Power

10 kW

Beam Incidence

Maximum incidence angle deviation ±5 mrad

Water supply
Minimum Flow Rate

0.7 l/min/kW (Recommendation 1.0 l/min/kW)

Minimum Water Pressure

4 bar

Water Quality

Operation with tap water
Operation also possible with demineralised water

Water curcuit

No use of aditives in the cooling circuit
Do not operate in a cooling circuit where aluminumcomponents are installed

The Flat Absorber temperature is to be monitored with a temperature sensor.
The cooling water flow rate is to be monitored.
Dimensions and Connection
Irradiation Area

120 × 88 mm

2 ELSA push-in fittings

Hose outer diameter 10 mm

VersionsNIR

Radiation from 1030 to 1060 nm wavelength

CO2Radiation with 10,6 µm wavelength

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Product Disposal

Provided that you are located in the EU, you are welcome to send your Flat Absorberto PRIMES Germany, where it will be disposed of free of charge (this service does notinclude shipping costs).

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35,0(615PRIMES GmbH
Max-Planck-Str. 264319 Pfungstadt
Germany
Telephone: +49 6157 9878-0