HBM BU18 User manual

A2306-1.3 en/de
Build-up-System
zur Kraftmessung
BU18
Mounting instructions
Montageanleitung
Build-up-System
for force measurement

English Page 3 −19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deutsch Seite 20 −35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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BU18
HBMA2306−1.3 en/de
Contents Page
Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Scope of supply 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Application notes 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Mounting 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Removing from the carrying case 9. . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Mechanical assembly 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Conditions on site 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Ambient temperature 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Moisture and humidity 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Air pressure 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Installation 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Electrical connection 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Pin assignment 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Specifications 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Dimensions 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 BU18/3MN dimensions 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 C18−S1/1MN dimensions 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4BU18
HBM A2306−1.3 en/de
Safety instructions
ATTENTION
Before using the build−up system, it is essential to also read and
understand the Mounting Instructions for the C18 force transducer. This
is included in the scope of supply.
Intended use
The BU18 build-up system must only be used for the accurate measurement of
compressive force. Use for any additional purpose shall be deemed to be not
as intended.
In the interests of safety, the transducer should only be operated as described
in the Mounting Instructions. It is also essential to comply with the legal and
safety requirements for the application concerned during use. The same applies
to the use of accessories.
The transducer is not a safety element within the meaning of its use as
intended. For safe and trouble−free operation, this transducer must not only be
correctly transported, stored, sited and mounted but must also be carefully
operated and maintained.
General dangers of failing to follow the safety instructions
The BU18 build-up system is a state of the art unit and as such is failsafe. The
build-up system may give rise to remaining dangers if it is inappropriately
installed and operated by untrained personnel.
Any person instructed to carry out installation, commissioning, maintenance or
repair of the build-up system must have read and understood the Mounting
Instructions and in particular the technical safety instructions.
Remaining dangers
The scope of supply and performance of the build-up system covers only a
small area of force measurement technology. In addition, equipment planners,
installers and operators should plan, implement and respond to the safety
engineering considerations of force measurement technology in such a way as
to minimize remaining dangers. Prevailing regulations must be complied with at
all times. There must be reference to the remaining dangers associated with
force measurement technology.

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BU18
HBMA2306−1.3 en/de
Remaining dangers are indicated in these Mounting Instructions by the
following symbols:
Symbol: DANGER
Meaning: Maximum danger level
Warns of an imminently dangerous situation in which failure to comply with
safety requirements will result in death or serious physical injury.
Symbol: WARNING
Meaning: Possibly dangerous situation
Warns of a potentially dangerous situation in which failure to comply with
safety requirements can result in death or serious physical injury.
Symbol: CAUTION
Meaning: Possibly dangerous situation
Warns of a potentially dangerous situation in which failure to comply with
safety requirements could lead to damage to property, slight or moderate
physical injury.
Symbols for application notes and useful information:
Symbol: NOTE
Means that important information about the product or its handling is being
given.
Symbol:
Meaning: CE mark
The CE mark enables the manufacturer to guarantee that the product
complies with the requirements of the relevant EC directives (the Declaration
of Conformity can be found at http://www.hbm.com/HBMdoc).

6BU18
HBM A2306−1.3 en/de
Unauthorized conversions and modifications are prohibited
The build-up system must not be modified from the design or safety
engineering point of view except with our express agreement. Any
modification shall exclude all liability on our part for any damage resulting
therefrom.
Qualified personnel
The build-up system must only be installed by qualified personnel, strictly in
accordance with the specifications and in conjunction with the safety
requirements and regulations listed below. It is also essential to observe the
appropriate legal and safety regulations for the application concerned. The
same applies to the use of accessories.
Qualified personnel means persons entrusted with the installation, assembly,
commissioning and operation of the product, who possess the appropriate
qualifications for their function.
Conditions on site
Protect the build-up system from moisture and humidity or weather conditions
such as rain, snow, etc.
Maintenance
The BU18 build-up system is maintenance free.
Accident prevention
The prevailing accident prevention regulations must be taken into account,
even though the nominal (rated) force values in the destructive range are well
in excess of the full scale value.

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BU18
HBMA2306−1.3 en/de
1 Scope of supply
C18−S1/1MN measuring body (Class 00 per ISO 376), 1 m cable
with fitted Fischer S103 A057−130 plug 3 units
C18 mounting base 3 units
C18 thrust piece 3 units
Pendulum 3 units
BU18 top plate 1 unit
BU18 mounting base 1 unit
Centering bolt 6 units
Centering bolt with eye nut 1 unit
Lifting anchor 1 unit
Ring bolts, rotating, including wrench 3 units
Distributor box with Fischer K103 A057−130 sockets 1 unit
Extension cable, six wire technique, 5 m,
Fischer K103 A057−130 socket and 15−pin D−Sub plug 1 unit
Connection cable, six wire technique, 7 m,
Fischer S103 A057−130 plug and 15−pin D−Sub plug 1 unit
Carrying case with chassis 1 unit
Accessories (not included in scope of supply)
•PTB calibration certificate per ISO 376;
to 5 MN; calibrated in compression direction K−CAL−FD7DS

8BU18
HBM A2306−1.3 en/de
2 Application notes
The BU18 build−up system is a modular measurement system for measuring
compressive forces. These can be measured to 3 MN with the complete
system, as well as to 1 MN with the individual C18−S1/1MN force transducers
(it is essential here to comply with the Mounting Instructions for the C18). This
allows the traceability of a force calibration system for 3 MN to be
implemented with the aid of the more accurately calibrated 1 MN force
transducer.
Because the system measures static and quasi−static compressive forces
with high accuracy and reproducibility, it must be handled carefully. It is
essential to keep to the mechanical structure described in these
Mounting Instructions, as measurement errors may otherwise occur.
Particular care must be taken when transporting and installing the system.
Dropping or knocking may cause permanent damage to the transducers.
The build−up system can be used with both DC voltage amplifiers and
carrier−frequency amplifiers with a maximum carrier frequency of 600 Hz.
With a PTB calibration to ISO 376, the Class 00 rating of the C18−S1/1MN
force transducer is assured. To achieve optimum accuracy, it is advisable to
calibrate the entire measurement chain. This comprises the transducer, the
cable and the amplifier.
The specifications list the permissible limits for mechanical, thermal and
electrical stress.
It is essential that these are taken into account when planning the measuring
set−up, during installation and ultimately, during operation.

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BU18
HBMA2306−1.3 en/de
3 Mounting
3.1 Removing from the carrying case
The system is delivered fully assembled. To remove it from the carrying case,
remove the upper attachment from the carrying case. The complete unit can
then be lifted at the central ring nut or alternatively by the three eyebolts at the
side.
ATTENTION
Before lifting, you must check that the ring nut is screwed right down
onto the centering bolt and that this is screwed right down onto the
lifting anchor. The eyebolts at the side must also be screwed right in
(use the wrench).
Use only approved hoisting gear with sufficient carrying force.
3.2 Mechanical assembly
The BU18 comprises a mounting base, the transducer, transducer mounting
base, pendulum and thrust piece assemblies and the top plate with the guide
element. The guide element is not designed to be removed.
The BU18 mounting base and the C18 mounting bases, as well as the
transducers themselves, are connected by centering bolts. These bolts are
interchangeable. A central lifting anchor with centering bolts is attached in the
top plate and three side eyebolts are attached to the BU18 mounting base for
transporting the BU18.

10 BU18
HBM A2306−1.3 en/de
Centering bolt with eye nut x 1
Lifting anchor x 1
BU18 top plate with
guide element x 1
Thrust piece x 3
Pendulum x 3
C18/1MN force transducers x 3
C18 mounting base x 3
Centering bolts x 6
BU18 mounting base x 1
Rotating eyebolt x 3
Fig. 3.1: Assembly diagram
The overall heights of the individual thrust piece, pendulum, transducer and
C18 mounting base assemblies match precisely and the surfaces are
superfinished. So the individual components must not be swapped between
the assemblies.
Each component is uniquely identified by the serial number of the associated
transducer and the position number. (see Fig. 3.2, Marking) The serial number
of the complete K−BU18 / 3MN system is located on the BU18 mounting
base.
The transducers must always be mounted by their respective mounting bases
onto the complete system mounting base.
To minimize reproducibility error, the angular position of the transducers and
mounting bases is specified. When assembled, the cable outputs must point
outward radially. For accurate positioning, there are also markings on all the
mounting bases as well as the measuring bodies. (see Fig. 3.2, Marking)

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BU18
HBMA2306−1.3 en/de
Transducer ID number
Position number
Position marking
BU18 ID number
Transducer ID number
Position number
2
Fig. 3.2: Marking
ATTENTION
When removing the top plate, the superfinished surfaces may cause the
thrust pieces to stick and detach without warning if shaken. The top
plate must therefore be removed with extreme caution!
NOTE
All contact surfaces must be clean and free of grease at all times. Dirt
can cause irreparable damage to the system.

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HBM A2306−1.3 en/de
NOTE
The individual components must be mounted with extreme caution. Any
damage to the contact surfaces, such as scratches or burrs, can affect
the accuracy of the force−proving instrument.
4 Conditions on site
4.1 Ambient temperature
The temperature effects on the zero signal and on the sensitivity are
compensated. To obtain optimum measurement results, the nominal (rated)
temperature range must be observed. Temperature−related measurement
errors can be caused by heating (e.g. radiant heat) or cooling on one side. A
radiation shield and all−round thermal insulation produce noticeable
improvements, but must not be allowed to set up a force shunt.
4.2 Moisture and humidity
External moisture and a tropical climate adversely affect transducer function.
Although the transducers and the mechanical loading fittings are made from
corrosion−resistant materials, it is possible that the surfaces may change
color. This does not affect the metrological properties.
4.3 Air pressure
Air pressure changes act on the C18−S1/1MN force transducer like a change
in force. Please note that pressure fluctuations offset the zero point. The
maximum zero point variation is 0.001% of the sensitivity at an ambient
pressure variation of around 10 mbar.

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5 Installation
•Handle the transducers and the loading fittings with care.
•Remove the centering bolt with the eye nut before use. The lifting anchor
can stay in the device during use.
•The upper and lower load application surfaces must be perfectly clean and
in level, parallel alignment. They must also be fully bearing and sufficiently
rigid to prevent unacceptable deformation (such as deflection) under load.
•When mounting the system, for example, when lowering it onto the
supporting points, it is important to ensure that the force transducers are
not exposed to sudden, heavy loads. Even transient loading can damage
them if permissible limit values are exceeded.
•With large or bulky materials or unfavorable installation conditions, it is
necessary to use suitable installation aids (auxiliary supports, lifting
devices).
•The build−up system must be installed in such a way that in its initial state,
it is free of lateral forces. The pendulum bearing must be in an exactly
vertical alignment and have freedom of movement to all sides.
•By virtue of the type of construction, the system is designed to even out the
bending of the testing machine and lateral offset within certain tolerances
(see specifications). But to improve measurement accuracy, these sources
of error must be excluded as much as possible.
•When being used as a reference for other force transducers, make sure
that placing suitable intermediate plates or thrust pieces underneath has
not caused the surface pressure to exceed 100 N/mm2at any of the load
application surfaces. Components must meet ISO 376 requirements.
•Any system loading must be exactly centered and axial. Suitable centering
elements or centering aids must be used for this.

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HBM A2306−1.3 en/de
6 Electrical connection
•Use shielded, low−capacitance measurement cables only (HBM cables
fulfill these conditions).
•Do not route measurement cables parallel to power lines and control
circuits. If this is not possible (in cable pits, for example), protect the
measurement cable with rigid steel conduits and keep it at least 50 cms
away from the other cables. The power lines or control circuits should be
twisted (15 twists per meter).
•Avoid stray fields from transformers, motors and contact switches.
•Do not ground the transducer, amplifier and indicator more than once. All
the devices in the measurement chain must be connected to the same
protective earth conductor.
•A four−wire configuration is used for the force transducers and the cable
must not be shortened.
•To achieve full accuracy, a six−wire configuration should be used for the
extension cable.
•The connection cable shielding is connected to the transducer housing.
•The BU18 build−up system can be connected both to carrier−frequency
and DC amplifiers. It is preferable to use high−precision amplifiers with a
200 −600 Hz carrier frequency.
ATTENTION
Under no circumstances must the force transducer’s screwed cable
gland be opened. Should this happen by mistake, the transducer must
be returned to the factory for repair.

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BU18
HBMA2306−1.3 en/de
6.1 Pin assignment
The transducers are connected in accordance with the marking to sockets
1 −3 of the distributor box. The 7 m long connection cable connects the
amplifier and the output (socket OUT) of the distributor box.
The three inputs are connected in such a way that the mean value of the three
transducers is indicated at the output. When adjusting the measurement
chain, set the average transducer sensitivity.
If the characteristic values vary greatly, use the correction network integrated
into the distributor box to adjust the sensitivity differences in such a way that
all the transducers have the sensitivity of the least sensitive transducer. Then
set the minimum sensitivity available at the amplifier.
The test reports of the three individual force transducers are included with the
system (or their calibration certificates if PTB calibration has also been
ordered for the individual transducers).
The best accuracy is achieved when a calibration report is available for the
entire system for setting up the measurement chain.
Direct measurement of a single force transducer:
Direct measurement can either take place via socket D of the distributor box
(without the correction network) or with the accompanying extension cable (5 m).
Connect directly to OUT
Channels 1 −3 with internal adjustment
Follow connection sequence
Fischer 103 A057−130 plug
15 PIN Sub−D plug
Amplifier
Fig. 6.1: Electrical connection

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7 Specifications
Type BU18 / 3 MN
Data per VDI 2638 and ISO 376
Nominal (rated) force Fnom kN 3000
Nominal (rated) sensitivity Cnom mV/V 2
Input resistance RiΩ4450 100
Output resistance RoΩ4010 2
Insulation resistance Ris Ω> 50 x 109
Reference excitation voltage Uref V 5
Operating range of the excitation voltage BU,G V5 ... 30
Trägerfrequenz der Speisespannung Hz < 600
Nominal (rated) temperature range Bt,nom °C+10 ... +40
Operating temperature range Bt,G °C−30 ... +80
Storage temperature range Bt,S °C−50 ... +85
Reference temperature tref °C +22
Max. operational force (FG) % 170
Limit force (FL) % 170
Breaking force (FB) % 400
Permissible horizontal displacement of top plate eGmm <2
Nominal (rated) displacement Snom mm 0,45
Weight (with VKK, without carrying case) kg 107
Degree of protection per EN 60529 IP53

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BU18
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Type C18−S1 / 1 MN
Data per VDI 2638 and ISO 376
Nominal (rated) force Fnom kN 1000
Class under ISO 376 (0.2 Fnom to Fnom)001)
Nominal (rated) sensitivity Cnom mV/V 2
Rel. sensitivity error dc% <0,1
Rel. zero signal error ds,o mV/V <1
Relative reproducibility and repeatability errors
(0.2Fnom to Fnom) for:
a constant mounting position b’ % <0,015
varying mounting positions b % <0,04
Relative interpolation error (0.2Fnom to Fnom)fc% <0,02
Rel. zero error (zero signal return) fo% <0,008
Relative reversibility error (0.2Fnom to Fnom)ν% <0,06
Rel. linearity error dlin % <0,025
Effect of temperature on sensitivity per 10 K
related to nominal (rated) sensitivity TKc% <0,01
Effect of temperature on zero signal per 10 K
related to nominal (rated) sensitivity TK0% <0,01
Relative creep over 30 min dcrF+E % <0,03
Effect of lateral forces (lateral force 10 % Fnom)dQ%< 0,1
Effect of eccentricity per mm dE%< 0,02
Input resistance RiΩ4450100
Output resistance RoΩ40102
Insulation resistance Ris Ω>50⋅109
Reference excitation voltage Uref V 5
Operating range of the excitation voltage BU,G V5 ... 30
Carrier frequency of the excitation voltage Hz <600
Nominal (rated) temperature range Bt,nom °C +10...+40
Operating temperature range Bt,G °C−30...+80
Storage temperature range Bt,S °C−50...+85
Reference temperature tref °C +22
Max. operational force (FG) % 170
Breaking force (FB) % 400
Nominal (rated) displacement Snom mm 0,45
Rel. permissible oscillatory stress Frb % 70
Weight kg approx. 15.3
Degree of protection per EN 60529 IP68
Cable length for for-wire technique with mounted
Fischer S103 A057−130 plug m 1
1) Classification only guaranteed in conjunction with a PTB calibration certificate to ISO 376.
Specifications for distributor box see VKK1−4 documentation.
The sockets installed of the screwed cable glands require IP53 protection (per
DIN EN 60529).

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HBM A2306−1.3 en/de
8 Dimensions
8.1 BU18/3MN dimensions
384
321
154
40 50
∅240
46
8.2 C18−S1/1MN dimensions
D
H
∅B
approx. 15
∅A
∅25
G
∅C
Type jA j BjC D G H
C18−S1 / 1 MN 100 150 150 171 40 90

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BU18
HBMA2306−1.3 en/de

20 BU18
HBM A2306−1.3 en/de
Inhalt Seite
Sicherheitshinweise 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Lieferumfang 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Anwendungshinweise 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Montage 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Entnahme aus Transportkoffer 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Mechanischer Zusammenbau 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Bedingungen am Einsatzort 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Umgebungstemperatur 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Feuchtigkeit 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Luftdruck 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Einbau 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Elektrischer Anschluss 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Anschlussbelegung 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Technische Daten 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Abmessungen 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 Abmessungen BU18/3MN 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 Abmessungen C18−S1/1MN 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .