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BB 51
Operating Instructions Manual
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Retsch BB 51 Operating Instructions Manual

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Jaw Crusher Type BB 51
Operating Instructions
© Retsch GmbH, 42781 Haan, Rheinische Str.36, Germany, Doc. No. GB 98.056.9999

Notes on the operating instructions

These operating instructions for the jaw crusher type BB 51 provide all the necessary information on the topics listed in the table of contents. The guide the target group(s) defined for the relevant subjects in safe and proper handling of the BB 51. Knowledge of the relevant chap­ters by the appropriate target group(s) is essential for safe and proper handling. This technical documentation comprises a reference work and a train­ing guide. The individual chapters are self-contained units. These operating instructions do not contain any instructions on re­pairs. Should any repairs become necessary, please contact your sup­plier or Retsch GmbH.
Notes on the operating instructions ...................2
Safety ........................................4
Notes on safety ................................4
Warning notes.................................5
Repairs .....................................5
Confirmation .................................5
Technical data ..................................6
Use for the intended purpose .......................6
Description of function...........................6
Protective devices ..............................7
Gap width adjustment ...........................7
Throughput, output fineness .......................7
Rated capacity of withdrawable receptacle ...............7
Noise data : ..................................7
IP ratings....................................7
Rated power ..................................7
Dimensions ..................................7
Required mounting surface ........................7
Transport and installation ..........................8
Packaging ...................................8
Transport ...................................8
Interim storage ................................8
Supply schedule................................8
Parameters for the installation location .................9
Installation ...................................9
Electrical connection ............................9
Operation .....................................10
Controls and operation ...........................10
Schematic drawing of the controls: ...............10
Overview of control elements ..................11
Operation of the BB 51 ............................12
Switching ON and OFF ..........................12
Set gap width to 00.0 ............................12
Starting the crushing process .......................13
Feeding in the input material .......................13
Interrupting the crushing process ....................14
Continuing the crushing process .....................14
Emptying the drawer ............................14
Notes on working procedures .......................15
General .....................................15
Input grain size ................................15
Quality of process material.........................15
Transport handles ..............................16
Cleaning ....................................16
Cleaning the drawer recess ....................16
Cleaning the crushing chamber .................17
Cleaning the interior of the casing ...............17
Maintenance ..................................17
Replacing jaws ................................18
Accessories ..................................19
Copyright ...................................19
Modifications .................................19
Safety regulations (table) ..........................20
Warranty conditions ..............................21

Safety

Target group: All persons dealing with the machine in any way
The BB 51 is a modern, powerful product from Retsch GmbH. It re­flects the state of the art. When the machine is handled correctly by persons familiar with this technical documentation, it is completely safe and reliable in operation.

Notes on safety

You, as the operator, are responsible for ensuring that the persons ap­pointed to work with the BB 51:
• have read and understood all the stipulations of the chapter on safety,
• are familiar before commencing work with all instructions and regulations for the relevant target group,
• have access to the technical documentation for this machine at all times and without difficulty.
Ensure that new staff have been familiarised with the rules for safe and proper handling before commencing work on BB 51 either by oral in­struction by a competent person and/or by this documentation.
Incorrect operation can lead to damage or injury. You are responsible for your own safety and that of your staff.
Ensure that no unauthorised persons have access to the BB 51.
For your own protection, have your staff confirm that they have been instructed in operation of the BB 51. A draft of an appropriate form can be found at the end of the chapter on safety.
No liability in any form will be accepted for damage or injury resulting from failure to observe the following notes on safety

Warning notes

We use the following symbols to warn against:
Personal injury
!
Damage to property

Repairs

These operating instructions do not contain any instructions on re­pairs. For your own safety, only have repairs performed by Retsch GmbH or an authorised agent (service technicians).
In such a case, please inform:
The Retsch agency in your country
Your supplier
Retsch GmbH direct
Your service address:
_____________________________
_____________________________
_____________________________
_____________________________

Confirmation

I have read and understood the foreword and the chapter on safety.
__________________________________________________
Signature of the operator
__________________________________________________
Signature of service technician

Technical data

Target group: Operators
Machine type designation: BB 51

Use for the intended purpose

The BB 51 is suitable for crushing of medium to extremely hard sub­stances and brittle and hard/tough materials. The achievable final out­put fineness can be up to 0.5 mm and less, depending on the input ma­terial. The maximum input grain size is 35 mm. The materials which can be crushed in the BB 51 include the follow­ing: Bakelite // bauxite // concrete // dolomite // ores // feldspar // granite // graywacke // glass // limestone // gravel // coal // coke // corundum // quartz // salts // refractory clay // slag // silicates // silicon // sintered materials // cement clinker, etc. This machine is not designed as a production machine but as a labora­tory machine intended for 8 hour single shifts with 30% total opera­tion time. Should you require any further details, the Retsch applications labora­tory will be pleased to assist.
Do not modify the machine in any way, and use only spare parts and accessories approved by Retsch.
The conformity with European Directives declared by Retsch will otherwise be invalidated. Furthermore, this will lead to all warranty claims being ren­dered null and void.

Description of function

Comminution in the BB 51 is effected by means of pressure.
The crusher chamber 1 is funnel shaped and tapers down towards the output end in accordance with the gap width which is infinitely adjustable in steps of 0.1 mm.
The BB 51 has a gap width adjustment mechanism 5 linked to a fixed crusher arm 4 and a moving crusher arm 3. Both crusher arms are fitted with replaceable jaws 2 between which comminution takes place by means of pressure.
The eccentric motion ( eccentricity=2.4mm / 960min 1028min
-1
at 60Hz ) of the moving crusher arm 3 steadily moves the input material until it is fine enough to pass through the set gap width and fall into a withdrawable receptacle 6.
The convex form of the replaceable jaws 2, which may be made of various different materials accelerates the process of comminution while preventing compaction and formation of bridges.
-1
at 50Hz and
17.12.1998 © Retsch GmbH 6 Doc. No. GB 98.056.9999

Protective devices

The crusher chamber of the BB 51 is enclosed on all sides by a robust steel plate casing.
The BB 51 can be safely started up even when the hopper lid is open and the output receptacle withdrawn, as its design in compliance with EN 294 precludes any inadvertent insertion of hands or objects.
A main switch fitted with a thermal overload relay on the back of the machine protects against current overload.

Gap width adjustment

From 0 to approx. 10 mm by handwheel in 0.1 mm steps. Digital gap width indicator.

Throughput, output fineness

The performance data, throughput and achievable final output fineness are dependent on the breakage behaviour and hardness of the process material and on the gap width set. They can only be determined em­pirically.

Rated capacity of withdrawable receptacle

Approx. 1000 ml

Noise data :

Noise measurement to DIN 45635-031-01-KL3 The noise levels are also influenced by the properties of the input ma­terial.
Example 1:
Sound power level L Workplace related emission level L
Service conditions :
Input material: none Crushing members : zirconia jaws Gap width set: 2mm
Example 2:
Sound power level L Workplace related emission level L
Service conditions :
Input material : quartz gravel of grain size approx. 25mm Crushing members : zirconia jaws Gap width set: : 2mm Output grain size: < 5 mm
= 78,3 dB(A)
WA
= 91,7 dB(A)
WA
= 68,7 dB(A)
pAeq
= 83,7 dB(A)
pAeq

IP ratings

IP20 IP00 on the side ventilation slits

Rated power

1100 W

Dimensions

Height: approx. 510mm, Width: approx. 360 mm, Depth: approx. 580 mm
Weight: approx. 79 kg / net

Required mounting surface

(462 mm x 1000 mm; no safety clearances necessary!)
Fig.1

Transport and installation

Target group: Operators

Packaging

The packaging is suitable for the mode of transport selected. It com­plies with the general packaging regulations.
Please keep the packaging for the duration of the guarantee pe­riod, as your guarantee claim will be endangered in the case of a complaint or return of the machine in inadequate packaging.

Transport

The handles M available as accessories (Order No. 32.825.0001) can be used to lift and carry the BB 51. Fig.1
The BB 51 must not be thrown, subjected to impact or shock during transport. The electrical and mechanical components may otherwise be damaged
Temperature fluctuations
When there are severe temperature fluctuations (e.g. during air transport) the BB 51 is to be protected from condensation. The electrical components may otherwise be damaged.

Interim storage

Also ensure that the BB 51 is stored in a dry location for interim peri­ods.

Supply schedule

• BB 51 with built-in crusher arms and wearing plates.
• 1 mains power cable.
• 1 instruction manual.
Check the delivery for completeness, including the accessories ordered individually.
Check the perfect function of the BB 51 (see chapter on operation).
On incomplete delivery and / or transport damage, you must no­tify the forwarding agent and Retsch GmbH immediately (within 24hrs). It may not be possible to take account of later com­plaints.
17.12.1998 © Retsch GmbH 8 Doc. No. GB 98.056.9999

Parameters for the installation location

Ambient temperature:
5°C to 40°C
If the ambient temperature falls below or exceeds the limits specified, the electrical and mechanical components may be dam­aged or the performance data changed to an unknown extent..
Humidity :
Maximum relative humidity 80% at temperatures up to 31°C, decreasing in a straight line to 50% relative humidity at 40°C.
At higher humidity, the electrical and mechanical components may be damaged and performance data changed to an unknown extent.
Site altitude:
max. 2000 m above sea level

Installation

Place the BB 51 jaw crusher on an even and stable surface, eg. a labo­ratory bench.

Electrical connection

• Consult the type plate for the voltage and frequency of the BB
51.
• Ensure that the values are in agreement with the mains power supply.
• Connect the BB 51 to the mains using the cable supplied.
Failure to observe the values on the type plate can result in dam­age to electronic or mechanical components.

Operation

Target group: Operators

Controls and operation

Schematic drawing of the controls:

Front view
ACHTUNG!
VOR ÖFFNEN DES GEHÄUSES
NETZSTECKER ZIEHEN!
PRIOR TO ANY OPENING OF THE HOUSING
DISCONNECT UNIT FROM MAINS!
RETIRER LA PRISE AVANT L'OUVERTURE DU BOITIER!
Rear view
17.12.1998 © Retsch GmbH 10 Doc. No. GB 98.056.9999

Overview of control elements

T
Item Element Illustration Function
A Mains power cable
B
Main switch ON/OFF with overload protection
C
START button
D
STOP button
E
Gap width indicator
Connects the machine to the mains power supply (earthed socket)
Connects and disconnects the controller from the mains power supply.
Disconnects the motor from the mains power supply in the event of overload.
Starts the BB 51.
Green LED lights up when the button is pressed.
Stops BB51.
Red LED lights up when the machine is switched on.
Puts the BB 51 in standby mode when pressed a second time.
Indicates the gap width set in mm.
F
Handwheel for setting gap width
G
Gap zero adjustment but­ton
H
Feed hopper and lid
K
Drawer
L
Receptacle with capacity of approx. 1000 ml
M
Transport handles
See preceding page
See preceding page
See preceding page
Turn clockwise to close the gap. Turn anti-clockwise to open the gap.
Press to reset the indicator display to 00.0.
akes the input material. Prevents the input material from
bouncing back and protects against excessive release of dust.
For insertion of receptacle L.
Holds the crushed output.
For lifting and carrying the BB 51.
Fig.2
Fig.3

Operation of the BB 51

Target group: Operators

Switching ON and OFF

The main switch B. is located on the back of the BB 51 Fig.2
• Switch the main switch B on.
The red LED above the STOP button D lights up.
The BB 51 is now ready for operation.

Set gap width to 00.0

The gap width must only be adjusted when the machine is empty. There must be no input material in the crusher chamber or feed hopper. Before starting the BB51 turn the handwheel F through two revolu­tions anti-clockwise so that the crusher jaws are out of contact with one another.
• Press the START button C. Fig.3
The red LED above button D goes out, the green LED above but­ton C lights up, the indicator display E reads 00.0. The machine starts up.
• Turn the handwheel F clockwise until you hear the sound of the crusher arms meeting.
• Press button G.
The indicator display E reads 00.0.
Gap width and indicator now tally with one another.
• Turning the handwheel F closes the gap.
• Turning the handwheel F opens the gap.
Before adjusting or starting the BB51 you must turn the handwheel
F through two revolutions anti-clockwise. The crusher jaws are then safely out of contact with one an­other, thus preventing jamming and possible damage to the jaws of the BB51.
Adjustment should be carried out regularly so as to ensure that the indicator display and the actual gap width tally. The greater the load on the BB 51 and the harder and more abrasive the input material, the more often a zero point adjustment must be carried out in order to compensate for wear.
The reading on the indicator display will otherwise not tally with the actual gap width.
The BB 51 must only be adjusted when the machine is empty. Jamming will result if there is any material in the crusher chamber or feed hopper before starting. This may result in damage to mechanical components.
Fig.4

Starting the crushing process

• Carry out adjustment as described in the preceding section.
• Press the START button C. Fig.4
The green LED above button C lights up, the BB 51 starts up.
• Set the desired gap width using the handwheel F.
Turn anti-clockwise to open the gap.
Turn clockwise to close the gap.
Display E indicates the gap width in mm.
The end of the crushing process is signalled by a change of noise and the machine can be switched off.

Feeding in the input material

The feed hopper H and the crusher chamber can take input material up to a grain size of 35 mm.
The feed hopper is not however intended for storage of process material: its function is solely that of feeding material into the crusher chamber. It also prevents inadvertent reaching into the crusher chamber, and stops process material from being ejected.. Fig.5
• Check that the drawer and inserted receptacle are pushed in.
Fig.5
• Open the lid on the feed hopper H.
• Feed the material into the hopper.
• Close the lid on the hopper H.
Feed material into the hopper only when the machine is in operation. Mechanical components may otherwise be damaged.
The maximum quantity of input material is limited by the capacity of the withdrawable receptacle. The useful capacity of the receptacle will depend on the properties of the input material. Remember to empty the receptacle in good time.
Crushed material must not be allowed to back up in the crusher chamber. Mechanical components may otherwise be damaged.
Fig.6

Interrupting the crushing process

The BB 51 must only be stopped when there is no more input material in the hopper and crushing chamber.
Mechanical components might otherwise jam and be damaged when the machine is restarted.
• Press the STOP button D. Fig.6
The red LED above button D lights up, the green LED above button C goes out. The machine stops.
• Press the STOP button D a second time.
The red LED stays lit, the display goes out and the machine is in standby mode. The last gap width setting is retained and the machine is still ready for operation.
The crushing process can be continued at any time, provided that the BB 51 has not been switched off at the main switch on the back of the machine and the red LED above button D is lit up.

Continuing the crushing process

• Press the START button C. Fig.6
The red LED above button D stays lit, the display indicates the last gap width setting.
• Press the START button C a second time.
Fig.7
The crushing process continues using the last gap width setting.

Emptying the drawer

• Stop the BB 51
• Pull out the drawer K to the stop.
• Remove the inserted receptacle L and empty it.
The maximum capacity of the receptacle L for particular types of in­put material must be determined empirically.
When emptying the withdrawable receptacle L first ensure that the B 51 has run empty before stopping it, ie. that there is no more input material in the crushing chamber or the feed hopper.
The crushed material will otherwise fall into the drawer recess rather than into the receptacle.
Be sure to always empty the drawer in good time so that the top of the heap of crushed material does not protrude into the crushing chamber.
Mechanical components might otherwise be damaged.

Notes on working procedures

Target group: Laboratory technicians

General

The BB 51 is a robust benchtop machine which can predominantly be used for preliminary pulverisation of hard or brittle materials. The performance data, throughput and achievable final fineness are dependent on the breakage behaviour and hardness of the process ma­terial, and on the gap width set. This machine is not designed as a production machine but as a labora­tory machine intended for 8 hour single shifts with 30% total opera­tion time.
Do not modify the machine in any way, and use only spare parts and accessories approved by Retsch.
The conformity with European Directives declared by Retsch will otherwise be invalidated. Furthermore, this will lead to all warranty claims being ren­dered null and void.

Input grain size

The maximum input grain size is determined by the size of the intake opening, and is max. 35 mm on the BB 51.

Quality of process material

In principle, any hard and brittle process material with a Mohs hard­ness >3 can be crushed in the BB 51. Moist or greasy process material with a Mohs hardness <3 tends merely to compact or cake in the crusher chamber as a result of the pressure applied by the crusher jaws. Proper crushing is not possible in such cases.
17.12.1998 © Retsch GmbH 15 Doc. No. GB 98.056.9999

Transport handles

A pair of handles fitting on to the top right and left hand sides of the BB 51 for convenient portability can be supplied as accessories (Order No.
32.825.0001).
• Insert and tighten the tommy screws G together with the transport handle TG in the threaded borings (cf. arrow in Fig.8).
The handles can be left on the BB 51. They increase the overall width of space required for the machine on the bench by approx. 115 mm.
Fig.8
Fig.9

Cleaning

Do not clean the BB 51 with running water.
Lethal hazard of electric shock!
Use only a damp rag.
Solvents must not be used, as they would wash out the grease
!
packing.

Cleaning the drawer recess

From time to time the recess containing the drawer must be cleaned. A regular visual check on the state of the recess should be made.
• Pull out the mains plug.
• Pull the drawer out to the stop.
• Remove the inserted receptacle.
• Loosen but do not remove the two cheesehead screws ZS with
an Allan key AF4 Fig.9
• Slide the two cheesehead screws ZS together with the plate PL fitted behind the drawer to the left.
• Take out the drawer.
The recess can now be cleaned.
Follow the same procedure in reverse to reassemble.
Fig.10

Cleaning the crushing chamber

From time to time the crushing chamber should be cleaned. An Allan key AF 4 is necessary for this. Fig.10
• Pull out the mains plug.
• Set the gap width to maximum.
• Remove the cheesehead screw S while at the same time lifting the
feed hopper from its mounting plate.
• Remove the feed hopper.
The crushing chamber is now accessible and can be cleaned using a small brush or vacuum cleaner of the kind used on computers.
Follow the same procedure in reverse to reassemble.
Operation of the BB 51 with the feed hopper removed is not permis­sible.
Risk of crushing fingers and hands!
!

Cleaning the interior of the casing

Fine dust may get inside the casing through holes in the drawer recess and this interior space should be cleaned from time to time using, for example, a vacuum cleaner of the kind used on computers. To do this, first dismantle the feed hopper using an Allan key AF4.
Fig.11
Fig.11
• Pull out the mains plug.
• Remove cheesehead screw S.
• Remove the feed hopper.
The interior of the casing is now accessible for cleaning. Follow the same procedure in reverse to reassemble.

Maintenance

The BB 51 is maintenance-free and no settings need be adjusted when the machine is used for its designated purpose.

Replacing jaws

The following tools are needed:
• Allan key AF 2,5
• Allan key AF4
• Allan key AF5
• Open jawed spanner AF8
• Philips head screwdriver size 2
Fig.12
• Pull out the mains plug.
• Remove the cheesehead screw Sch1 on the feed hopper using an Allan key AF4.
• Remove the feed hopper.
• Set the gap width to maximum by turning the handwheel anti-clockwise to the stop.
• Remove the screws S1 at the side using an Allan key AF4 and take off the top of the casing.
• Take care with the earth cable!
• Using a size 2 Philips head screwdriver, remove the four oval head screws Sch2 and remove the two cover plates.
• Using an open jawed spanner AF 8, remove the eight hexagonal cap screws Sch3
• Remove the two hexagonal cap screws Sch4 using an Allan key AF 2.5 and take out the plate.
• Pull the traverses upwards and out.
• Remove the four cheesehead screws Sch5 using an Allan key AF5. During assembling the tightening torque must not
exceed 10 Nm.
• Remove the shim K1.
• Change the jaws B1.
Follow the same procedure in reverse to reassemble.
Operation of the BB 51 with the feed hopper removed is not permissible.
!
Risk of crushing fingers and hands!
17.12.1998 © Retsch GmbH 18 Doc. No. GB 98.056.9999

Accessories

• Order No. 05.242.0028 = Spare V-belt.
• Order No. 32.825.0001 = Transport handles, 1 pair.
• Order No. 22.048.0010 = Crusher jaws, tungsten carbide, 1 pair.
• Order No. 22.048.0011 = Crusher jaws, zirconia, 1 pair.
• Order No. 22.048.0012 = Crusher jaws, stainless steel, 1 pair.
• Order No. 22.048.0013 = Crusher jaws, special steel, 1 pair.
• Order No. 22.048.0014 = Crusher jaws, manganese steel, 1 pair.
• Order No. 22.711.0007 = Wearing plates, zirconia, 1 pair.
• Order No. 22.711.0008 = Wearing plates, tungsten carbide, 1 pair.
• Order No. 22.711.0009 = Wearing plates, stainless steel, 1 pair.

Copyright

This documentation may only be duplicated or passed on to third par­ties, its contents passed on or otherwise used with the express approval of Retsch GmbH. Contraventions will give rise to liability for damages.

Modifications

We reserve the right to make technical modifications without notice.

Safety regulations (table) for the BB 51 with reference to the individual chapters

Subject Action Hazard
Modifications to the machine
Safety
Packing
Transport
Temperature fluctuations
Scope of supply
Ambient temperature
Humidity
Electrical connection Operation
Gap width adjustment
Feeding in the input material
Interrupting the crushing process
Emptying the drawer
Cleaning
Cleaning the crushing chamber
Replacing crusher jaws
Do not modify the machine in any way, and use only spare parts and accessories approved by Retsch.
The conformity with European Directives de­clared by Retsch will otherwise be invalidated.
Failure to observe the notes on safety can lead to dam­age to property and personal injury.
Please keep the packing for the duration of the guaran­tee period. The BB 51 must not be thrown or otherwise subjected to impact or vibration during transport. When there is a likelihood of temperature fluctuations the BB 51 must be protected against condensation. In cases of incomplete delivery and/or transport dam­age, you must notify the forwarding agent and Retsch GmbH without delay (within 24 hours). Not below 5°C. Not above 40°C. Maximum relative humidity 80% at temperatures up to 31°C or 50% (decreasing in a straight line) at 40°C. Mains power differs from the values on the type plate. Electrical components may be damaged.
When starting, stopping or interrupting the operation of the machine, ensure that the crushing chamber and feed hopper are empty.. Adjustment should be carried out regularly so as to en­sure that the indicator display and the actual gap width tally. The greater the load on the BB 51 and the harder and more abrasive the input material, the more often a zero point adjustment must be carried out in order to compensate for wear. The BB 51 must only be adjusted when the machine is empty. Feed material into the hopper only when the machine is in operation.. The maximum quantity of input material is limited by the capacity of the withdrawable receptacle. The useful capacity of the receptacle will depend on the properties of the input material. Remember to empty the recepta­cle in good time. The BB 51 must only be stopped when there is no more input material in the hopper and crushing cham­ber. When emptying the withdrawable receptacle L first ensure that the B 51 has run empty before stopping it, ie. that there is no more input material in the crushing chamber or the feed hopper. Be sure to always empty the drawer in good time so that the top of the heap of crushed material does not protrude into the crushing chamber.. Do not clean the BB 51 under running water. Using solvents is prohibited. Operation of the BB 51 with the feed hopper removed is not permissible. Operation of the BB 51 with the feed hopper removed is not permissible.
This will lead to all warranty claims being rendered null and void..
We accept no liability whatsoever for any damage or in­jury resulting from non-observance of the notes on safety. Return of goods in inadequate packing may jeopardise your entitlements under the guarantee. Electrical and mechanical components may be damaged.
Electrical components may be damaged.
It may not be possible to accept subsequent complaints.
Electrical and mechanical components may be damaged and performance data change to an unknown extent. Electrical and mechanical components may be damaged and performance data change to an unknown extent.
Mechanical components may be damaged by blockage..
The reading on the indicator display will otherwise not tally with the actual gap width
Mechanical components may be damaged by blockage.
Mechanical components may be damaged.
Crushed material must not be allowed to back up in the crusher chamber. Mechanical components may otherwise be damaged.
Mechanical components might otherwise jam and be damaged when the machine is restarted.
The crushed material will otherwise fall into the drawer recess rather than into the receptacle.
Mechanical components may be damaged.
Lethal electric shock hazard!
Grease packings could be washed out.
Risk of crushing fingers and hands!
Risk of crushing fingers and hands!
.

Warranty conditions

1. In the case of justified complaints, we will repair or replace the defective parts at no charge.
The purchaser shall only be entitled to withdraw from the contract or reduce the purchase price when, at our decision, repair is impractical or impossi ble or replacements cannot be supplied or cannot be supplied in due time, or when a reasonable period of grace of at least six weeks set by the customer has expired without result due to circumstances within our control.
Should the attempt to repair or replace defective parts finally fail, the customer may at his op-
tion require a reduction of the purchase price or withdraw from the contract. Further claims, in particular such for damages not suffered by the object itself, such as loss of production, shall be excluded unless caused by intent or negligence on our part. We pass on the liability of the manufacturer(s) for bought-in products.
2. We shall bear the direct costs of repair or replacement on condition that the complaint has proven to be justified. This also applies to the costs of shipment and reasonable costs for dis­mantling and installation. The customer shall however be obliged to bear the costs of providing his own fitters and ancillary personnel at site. Should our customer operate abroad, we shall, al­ternatively, be entitled to bear the costs of rectification, and in particul ar transport, travel and material costs, ex-German border.
3. The warranty term for newly manufactured goods is two years, for used it is one year. The guarantee refers to deployment in a laboratory in 1-shift operation. In case of multi-shift
operation or other areas of application, the guarantee term is shortened accordingly. No warranty is given for parts subject to wear and tear.
4. We warrant that our goods are free of manufacturing defects. The suitability, classification and function of our goods shall be exclusively determined by the specifications in the acknowledge­ment of order, even if these deviate from the order. In such cases, the customer shall have the option of drawing our attention to any deviations from the order within two weeks of receipt of our acknowledgement, and reaching agreement with us. Should no objection be raised to the specifications in the acknowledgement of order, these shall be deemed accepted.
In the absence of any agreement to the contrary, we shall accept no liability for the suitability of
the object supplied for the purpose intended by the customer. The same shall apply to perform­ance data expected by the customer, unless we have been able to perform appropriate, realistic laboratory trials in advance and declared the corresponding performance data to be firm and binding in writing in our acknowledgement of order.
5. Our warranty shall also become null and void if persons other than those appointed by ourselves perform repairs or other work on or modifications to goods we have suppli ed or use unsuitable accessories, provided that their is a causal rel ationship between such actions and the defects which appear. For the rest, our warranty is dependent on compliance with our operating instruc­tions.
6. If the goods are installed in other systems or production facilities by the customer without our prior approval, or connected to, linked with or processed on such systems or production facili­ties, our warranty is exclusively limited to the parts we have supplied.
7. Repair or replacement of defective parts shall be effected at our option either at the poi nt of in­stallation of the object purchased, or at our corporate location. When repairs take place at the point of installation, the customer is to afford our representative unimpeded access for as long as required to the object purchased. The customer may for the rest only require the perform­ance of the warranty work during normal local business hours. Shoul d warranty work be per­formed at the customer’s request outside our normal business hours, the customer is to pay the additional costs. Should he require further special work over and above the warranty work, these costs are also to be borne on the basis of our current prices.
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