HBM PACEline CLP Series User manual

A3616-1.0 en/de/fr
Piezoelectric
force washer
Piezoelektrischer
Kraftmessring
Anneau dynamométrique
piézo-électrique
CLP
Mounting instructions
Montageanleitung
Notice de montage

English Page 3 - 19.................................................
Deutsch Seite 21 - 37...............................................
Francais Page 39 - 55...............................................

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Contents Page
English
Safety Instructions 4..............................................
1 Scope of Supply 8.............................................
2 Application Instructions 9......................................
3 Structure and Principle of Operation 10...........................
4 Conditions at the Installation Location 11.........................
4.1 Ambient Temperature 11....................................
4.2 Moisture and Humidity 12....................................
4.3 Deposits 12................................................
5 Mechanical Installation 13.......................................
5.1 Important Precautions during Installation 13....................
5.2 General Installation Guidelines 13............................
6 Connection 16..................................................
7 Specifications (VDI/VDE/DKD 2638) 17............................
8 Dimensions 18.................................................

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Safety Instructions
Intended use
Force transducers of the CLP type series are solely designed for measuring
static and dynamic compressive forces within the load limits specified by the
technical data for the respective maximum capacities. Any other use is not the
intended use.
To ensure safe operation, the regulations in the mounting and operating
instructions must be complied with, together with the following safety
requirements and the data specified in the technical data sheets included with
delivery. It is also essential to observe the applicable legal and safety
regulations for the relevant application.
The force transducers are not intended for use as safety components. Please
also follow the instructions in the section “Additional safety precautions".
Proper and safe operation of force transducers requires proper transportation,
correct storage, siting and mounting, and careful operation.
Operating personnel
Mounting and operation of force transducers must only be carried out by
suitably qualified personnel. Qualified personnel in this respect means
persons entrusted with siting, mounting, starting up and operating the product,
who are familiar with the operation of the force transducers and possess the
appropriate qualifications for operating them.
Load carrying capacity limits
Comply with the data in the technical data sheet when using the force
transducer. In particular, the respective maximum loads specified must never
be exceeded. The following limits set out in the technical data sheets must not
be exceeded
Limit loads
Lateral load limits
Breaking loads
Permissible dynamic loads
Temperature limits
When several force transducers are connected, it must be noted that the load/
force distribution is not always uniform.
Use as a machine element
The force transducers can be used as machine elements. When used in this
manner, it must be noted that, to favor greater sensitivity, the force transducer
cannot be designed with the safety factors usual in mechanical engineering.

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Please refer here to the section “Loading carrying capacity limits" and to the
specifications.
Additional safety precautions
The force transducers cannot (as passive transducers) implement any
(safety‐relevant) cutoffs. This requires additional components and
constructive measures for which the installer and operator of the plant is
responsible.
In cases where a breakage or malfunction of the force transducer would
cause injury to persons or damage to equipment, the user must take
appropriate additional safety measures that meet at least the requirements of
applicable safety and accident prevention regulations (e.g. automatic
emergency shutdown, overload protection, catch straps or chains, or other fall
protection).
The electronics conditioning of the measurement signal should be designed
so that measurement signal failure does not cause damage.
General dangers of failing to follow the safety instructions
The force transducers are state‐of‐the‐art and reliable. There may be risks
involved if the transducers are mounted, sited, installed and operated
inappropriately, or by untrained personnel. Every person involved with siting,
starting‐up, operating or repairing a force transducer must have read and
understood the mounting instructions and in particular the technical safety
instructions. The force transducers can be damaged or destroyed by
non‐designated use of the force transducer or by non‐compliance with the
mounting and operating instructions, these safety instructions or any other
applicable safety regulations (BG safety and accident prevention regulations)
when using the force transducers. Force transducers can break, particularly in
the case of overloading. The breakage of a force transducer can also cause
damage to property or injury to persons in the vicinity of the force transducer.
If force transducers are not used according to their designated use, or if the
safety instructions or specifications in the mounting and operating instructions
are ignored, it is also possible that the force transducers may fail or
malfunction, with the result that persons or property may be affected (due to
the loads acting on or being monitored by the force transducers).
The scope of supply and performance of the transducer covers only a small
area of force measurement technology, as measurements with piezoelectric
sensors presuppose the use of electronic signal processing. 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 residual dangers. On‐site regulations
must be complied with at all times.

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The marking below warns of a potentially dangerous situation in which failure
to comply with safety requirements can result in death or serious physical
injury.
WARNING
Description of a potentially dangerous situation
Measures to avoid/prevent the danger
The marking below warns of a potentially dangerous situation in which failure
to comply with safety requirements can result in slight or moderate physical
injury.
CAUTION
Description of a potentially dangerous situation
Measures to avoid/prevent the danger
The marking below draws your attention to a situation in which failure to
comply with safety requirements could lead to damage to property.
NOTE
Description of a situation that can lead to damage to property
Waste disposal
In accordance with national and local environmental protection and material
recovery and recycling regulations, old transducers that can no longer be
used must be disposed of separately and not with normal household waste.
If you need more information about disposal, please contact your local
authorities or the dealer from whom you purchased the product.
Conversions and modifications
The transducer 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.

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Qualified personnel
Qualified personnel means persons entrusted with siting, mounting, starting
up and operating the product, who possess the appropriate qualifications for
their function.
This includes people who meet at least one of the three following
requirements:
- Knowledge of the safety concepts of automation technology is a
requirement and as project personnel, you must be familiar with these
concepts.
- As automation plant operating personnel, you have been instructed how to
handle the machinery. You are familiar with the operation of the equipment
and technologies described in this documentation.
- As system startup engineers or service engineers, you have successfully
completed the training to qualify you to repair the automation systems. You
are also authorized to ground and label circuits and equipment and place
them in operation in accordance with safety engineering standards.
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 force transducer must only be installed by qualified personnel, strictly in
accordance with the specifications and with safety requirements and
regulations.
Maintenance
The CLP force transducer 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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1 Scope of Supply
Order no.
1-CLP/7kN Piezoelectric force washer CLP/7kN with manufacturing certificate
1-CLP/26kN Piezoelectric force washer CLP/26kN with manufacturing certificate
1-CLP/62kN Piezoelectric force washer CLP/62kN with manufacturing certificate
To be ordered separately:
Order no.
1-KAB143-3 Transducer connection cable (material: PFA), 3m long, 10-32 UNF
connector plug at both ends
1-KAB176-2 Transducer connection cable (material: PFA), 2m long; 10-32 UNF
connector plug on transducer side, BNC on amplifier side (e.g.
suitable for digital charge amplifier CMD600)
1-CCO Coupling for piezoelectric cable, for plug 10-32UNF
1-CSB4/1 Summing box for connecting piezoelectric sensors in parallel

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2 Application Instructions
Piezoelectric force washers of the CLP type series are suitable for measuring
compressive forces. Because they provide highly accurate dynamic and
quasi‐static force measurements, they must be handled very carefully.
Particular care must be taken when transporting and installing the devices.
Dropping or knocking the transducer may cause permanent damage.
The transducers are extremely rigid and have a high natural frequency.
The Specifications (VDI/VDE/DKD 2638) section on page 17 lists the
permissible limits for mechanical, thermal and electrical stress. It is essential
to take these limits into account when planning the measuring set‐up, during
installation and, ultimately, during operation.

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3 Structure and Principle of Operation
The CLP force washer is based on the piezoelectric principle.
Compressive forces are transmitted via the upper and lower force application
surfaces to measuring elements that are sensitive to force. These separate
the electrical charges in proportion to the applied force. A charge amplifier can
then convert these electrical charges to an analog voltage signal.
Fig. 3.1: Force is applied via the upper and lower force application surface
The piezoelectric principle of measurement requires only minimum
displacement. The transducer therefore features unusually high stiffness. Due
to the resulting high resonance frequencies, piezoelectric force transducers
are ideally suited for dynamic applications.
The force washer is hermetically welded and the coaxial cable is permanently
connected with the sensor. Compressive force generates a negative electrical
charge.

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4 Conditions at the Installation Location
Protect the force washer from moisture and dampness or weather conditions
such as rain, snow, ice and salt water.
CAUTION
Measurement errors (forces too small or too large) occur if the
insulation resistance becomes less than 1011 ohms. This could lead to
overload of the measurement equipment and therefore danger for the
operating personnel of the system in which the transducer is installed.
To obtain sufficiently high values, all the plug connections have to be kept
thoroughly clean. A positive or negative signal drift of the nominal (rated)
output signal without any force applied indicates insufficient insulation
resistance. The plug connection contacts should therefore be cleaned with a
clean, lint‐free cloth and a cleaning agent (pure isopropanol).
Protect the transducer plug against pollution and under no circumstances
touch it (plug face) with your fingers. The supplied cover should always be in
place when the connection is not in use.
NOTE
To avoid damage and incorrect measurements, the connection cable should
remain connected to the transducer following initial assembly. The transducer
must not be operated without a charge amplifier being connected.
4.1 Ambient Temperature
The effect of the temperature on the sensitivity is low and can be ignored.
However, thermal stresses will occur if the force washer is warmed unevenly
and these stresses will generate an output signal. The following measures
improve the stability of the measurement:
Store the transducer for sufficient time at the application temperature.
Avoid temperature fluctuations, e.g. from hand warmth, shortly before
measurement.
Implement a reset after every measurement cycle.
Note the temperature limits of the transducer (see Specifications section,
page 17).

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4.2 Moisture and Humidity
Moisture and humidity or a tropical climate are to be avoided. When the
connection cable is properly connected to the force washer and charge
amplifier, the CLP force washer has degree of protection IP65 as per DIN EN
60529.
The housing of the transducer is completely made of stainless steel. The
transducer must be protected against chemicals that could attack the
transducer body steel or the cable.
With stainless steel force transducers, please note that acids and all materials
which release ions will also attack stainless steels and their welded seams.
Should there be any corrosion, this could cause the force transducer to fail. In
this case, appropriate protective measures must be implemented.
4.3 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate
sufficiently to divert any of the measuring force, thus invalidating the
measured value (force shunt).

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5 Mechanical Installation
5.1 Important Precautions during Installation
Handle the transducer with care.
Welding currents must not be allowed to flow over the transducer. If there is
a risk that this might happen, you must use a suitable low‐resistance
connection to electrically bypass the transducer. HBM provides the highly
flexible EEK ground cable for this purpose, for example. It can be screwed
on above and below the transducer.
Make sure that the transducer cannot be overloaded.
WARNING
There is a danger of the transducer breaking if it is overloaded. This can
cause danger for the operating personnel of the system in which the
transducer is installed.
Implement appropriate safety measures to avoid overloads or to protect
against the resulting dangers.
5.2 General Installation Guidelines
The forces to be measured must act perpendicularly to the force washer.
Torsional and bending moments, eccentric loading and lateral forces may
produce measurement errors and destroy the transducer if limit values are
exceeded (see Specifications).
In the CLP series force washers, the maximum bending moment is dependent
on the loading with a force in the measurement direction. The following rule
applies: A force washer loaded with nominal (rated) force must not be
additionally loaded with a bending moment. This also applies to a force
washer where no force is acting in the measurement direction. The maximum
permissible bending moments can be found in the “Specifications" section, on
page 17.
The transducer needs to be pre‐stressed so that forces can be measured. We
recommend selecting a pre‐stressing value so that the sum of the pre‐stress
force and the force to be measured is equal to approximately half the nominal
(rated) force of the force washer. The force washer can be loaded with the
largest bending moment in this range. The minimum pre‐stress force must be
10% of the nominal (rated) force. The force washer itself can be used to
determine the pre‐stress force: The test certificate accompanying the

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transducer contains the sensitivity that you need to set on the charge amplifier
in this mounting step.
The contact surfaces that transmit the force to the piezoelectric transducer
must be flat, stiff and clean. Paint and coatings must be removed.
Components that come directly into contact with the force application surfaces
of the force washer should have a hardness value of at least 43 HRC.
The required pre‐stress can be achieved with a screw. Please see the note in
the table below. The property class of the screw must be 10.9 or 12.8. In all
cases, the force washer works in a force shunt as the component that
generates the pre‐stress is mounted in parallel to the force washer (parallel
switched springs). Fig. 5.1 shows use under pre‐stressing by surrounding
construction.
F
Force washer
Surrounding construction
Fig. 5.1: Force washer mounting with force shunt measurement and pre‐stress
generation by means of the surrounding construction
The sensitivity of the measurement chain is reduced by these installation
requirements. Calibration (measuring) is therefore always necessary in the
mounting conditions. Both precise reference force transducers (e.g. C18
series) and the calibrated piezoelectric sensors in the CFT series are
available for this purpose. You can also request calibration from HBM. The
HBM calibration laboratory would be happy to provide you with an offer
regarding the calibration of your pre‐stressed sensors. This is always possible
if your design can be installed in our calibration system.

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NOTE
Pre‐stress forces must act precisely in the measurement direction. Bending
moments or lateral forces must not occur. Otherwise the transducer can be
destroyed.
Ground, Ra0.5
Components supplied by
customer
Component supplied by customer
Force to be measured Force to be measured
Fig. 5.2: Force washer pre‐stressed by screw
WARNING
If you will be introducing tensile forces, observe the maximum loading.
There is a danger of breakage if permissible loading is exceeded. This
can cause danger for the operating personnel of the system in which the
transducer is installed.
When tensile forces are exerted, the tensile force acts in addition to the
pre‐stress force on the pre‐stressing elements. These elements must
therefore be designed appropriately.
Mounting is as shown in Fig. 5.2. Adjust the pre‐stress by measuring the force
washer. The recommended values for pre‐stress can be found in the following
table depending on the CLP type.

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Force washer For screw type
see ISO4762 Recommended pre‐stress
force in N
Tightening
torque
in Nm
Minimum thread
reach
in mm
1-CLP/7kN M4 x 0.7 7 1.5 5
1-CLP/26kN M8 x 1.25 18 9.4 10
1-CLP/62kN M12 x 1.75 30 32.4 15
6 Connection
Sensors of series CLP are delivered with a permanently integrated connection
cable 1m in length. You can use a coupling (for example coupling 1-CCO
available from HBM) to connect an extension cable.
Handle the transducer connection cable carefully as it cannot be repaired. If it
is damaged, the complete sensor must be replaced.
CMD charge amplifier
CLP piezoelectric force washer

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7 Specifications (VDI/VDE/DKD 2638)
Type CLP/...
Nominal (rated) force Fnom kN 7 26 62
Accuracy
Relative reversibility error v% 1
Relative linearity error dlin % 1
Characteristic electrical values
Sensitivity (typical)1) SpC/N -4.3
Insulation resistance Rins > 1013
Connection Integrated cable, 1m long,
plug 10-32UNF
Temperature
Nominal (rated) temperature range BT, nom
C
-20  +120
Operating temperature range BT, G-20  +120
Storage temperature range BT, S-20  +120
Characteristic mechanical qualities
Max. operating force FG
%
115
Limit force FL150
Breaking force FB200
Maximum bending moment 2)
with Fz = 0%
with Fz = 50%
with Fz = 100%
Mb perm Nm 0
5
0
0
35
0
0
134
0
Static lateral limit force 3) FQ% of Fnom 10
Nominal (rated) displacement snom m 3 3.5 4.5
Fundamental resonance frequency fGHz 105 120 140
Relative permissible oscillatory stress Frb % of Fnom 100
General information
Degree of protection per EN 60529 IP65
Sensor material Stainless steel, quartz
Cable sheath material FPM (fluorocarbon rubber)
Potting compound material Silicone
Cable length m 1
Plug 10-32UNF
Mass mg 6.5 22 30
1) Must be calibrated under mounting conditions
2) Fz is the force in the measurement direction
3) Relative to a point of contact on the force application surface

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8 Dimensions
B
D
A
C
H
A
C
FE
FE
I
Y
G
J
R9
Type A B C D E F G H I J Y
CLP/7kN 5.5 4.1H7 9.9 12-0.03 0.2 0.2 2 3-0.05 2.7 1.9 8.3
CLP/26kN 9.8 8.1H7 17.9 20-0.05 0.32 0.32 2 3.5-0.05 2.7 1.9 8.3
CLP/62kN 13.8 12.1H7 27.9 30-0.05 0.45 0.45 2 4-0.05 2.7 1.9 8.3
Type ISO4762 H in
mm d1 in mm A in mm Recommended pre‐stress
force in N
Tightening
torque in Nm Minimum thread reach
in mm
1-CLP/7kN M4 x 0.7 3 4.1 8 7 1.5 5
1-CLP/26kN M8 x 1.25 3.5 8.2 16 18 9.4 10
1-CLP/62kN M12 x 1.75 4 12.3 24 30 32.4 15

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Scope of supply
Order no.
1-CLP/7kN Piezoelectric force washer CLP/7kN with manufacturing certificate
1-CLP/26kN Piezoelectric force washer CLP/26kN with manufacturing certificate
1-CLP/62kN Piezoelectric force washer CLP/62kN with manufacturing certificate
Accessories:
Order no.
1-KAB143-3 Transducer connection cable (material: PFA), 3m long, 10-32 UNF
connector plug at both ends
1-KAB176-2 Transducer connection cable (material: PFA), 2m long; 10-32 UNF
connector plug on transducer side, BNC on amplifier side (e.g.
suitable for digital charge amplifier CMD600)
1-CCO Coupling for piezoelectric cable, for plug 10-32UNF
1-CSB4/1 Summing box for connecting piezoelectric sensors in parallel

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