HBM C11 Series User manual

Mounting Instructions | Montageanleitung |
Notice de montage
English Deutsch Français
C11

Hottinger Brüel & Kjaer GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com
Mat.: 7-0111.0008
DVS: A05449_01_Y00_02 HBM: public
06.2021
EHottinger Baldwin Messtechnik
Subject to modifications.
All product descriptions are for general information only.
They are not to be understood as a guarantee of quality or
durability.
Änderungen vorbehalten.
Alle Angaben beschreiben unsere Produkte in allgemeiner
Form. Sie stellen keine Beschaffenheits- oder Haltbarkeits
garantie dar.
Sous réserve de modifications.
Les caractéristiques indiquées ne décrivent nos produits
que sous une forme générale. Elles n'impliquent aucune
garantie de qualité ou de durabilité.

Mounting Instructions | Montageanleitung |
Notice de montage
English Deutsch Français
C11

2A05449_01_Y00_02 HBM: public C11
English
1 Safety instructions 3........................................
2 Markings used 7............................................
2.1 The markings used in this document 7..........................
3 Scope of supply and equipment variants 8...................
4 General instructions for use 9...............................
5 Structure and mode of operation 10...........................
5.1 Transducer 10................................................
5.2 Strain gage covering agent 10..................................
6 Conditions on site 11........................................
6.1 Ambient temperature 11.......................................
6.2 Moisture and corrosion protection 11............................
6.3 Deposits 12..................................................
7 Mechanical installation 13....................................
7.1 Important precautions during installation 13......................
7.2 General installation guidelines 13...............................
8 Electrical connection 15......................................
8.1 EMC protection 16............................................
9 Ordering numbers 17........................................
10 Specifications 18............................................
11 Dimensions in mm 20........................................

Safety instructions
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1 Safety instructions
Intended use
Force transducers in the C11 series are designed solely for measuring static
and dynamic compressive forces within the load limits stated in the
specifications. Any other use is not the intended use.
To ensure safe operation, it is essential to comply with the regulations in the
mounting instructions, the safety requirements listed below, and the data
specified in the supplied technical data sheets. It is also essential to observe
the applicable legal and safety regulations for the relevant application.
Force transducers are not intended for use as safety components. Please also
refer to the "Additional safety precautions" section. Proper and safe operation
of force transducers requires proper transportation, correct storage, setup and
mounting, and careful operation.
Load-carrying capacity limits
The information in the technical data sheets must be observed when using the
force transducers. The respective specified maximum loads in particular must
never be exceeded. The following limits set out in the technical data sheets
must not be exceeded:
SForce limits
SBreaking forces
SPermissible dynamic loads
STemperature limits
SElectrical load limits
Please note that when several force transducers are interconnected, the load/
force distribution is not always uniform.
Use as machine elements
Force transducers can be used as machine elements. When used in this man
ner, note that to favor greater sensitivity, force transducers were not designed
with the safety factors usual in mechanical engineering. Please refer to the
"Load-carrying capacities" section and to the specifications on page 18.

Safety instructions
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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.
Additional safety precautions
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 precautions that meet at least the applicable safety and
accident prevention regulations (e.g. automatic emergency shutdown, overload
protection, catch straps or chains, or other fall protection).
The electronic processor that processes the measurement signal should be
designed so that failure of the measurement signal cannot lead to secondary
failures.
General dangers of failing to follow the safety instructions
Force transducers are state-of-the-art and failsafe. Transducers can give rise
to residual dangers if they are mounted, installed, used and operated
inappropriately or by untrained personnel. Every person involved with setting
up, 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 manual, these safety instructions or other applicable safety
regulations (safety and accident prevention regulations of the Employers'
Liability Insurance Association) when using the force transducers. A force
transducer can break, particularly if it is overloaded. The breakage of a force
transducer can cause damage to property or injury to persons in the vicinity of
the force transducer.
If force transducers are not used as intended, or if the safety instructions or
specifications in the mounting and operating instructions are ignored, it is also
possible that a force transducer may fail or malfunction, with the result that

Safety instructions
C11 A05449_01_Y00_02 HBM: public 5
persons may be injured or property damaged (due to the loads acting on or
being monitored by the force transducer).
The scope of supply and performance of the transducer covers only a small
area of force measurement technology, as measurements with (resistive) strain
gage sensors presuppose the use of electronic signal processing. Equipment
planners, installers and operators should always plan, implement and respond
to the safety engineering considerations of force measurement technology in
such a way as to minimize residual dangers. Pertinent national and local
regulations must be complied with.
Conversions and modifications
The design or safety engineering of the transducer must not be modified with
out our express permission. Any modification shall exclude all liability on our
part for any damage resulting therefrom.
Maintenance
The force transducers of the C11 series are maintenance free. We recommend
to calibrate the force transducer at regular intervals.
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 garbage.
If you require more information about disposal, please contact your local
authorities or the dealer from whom you purchased the product.
Qualified personnel
Qualified personnel means persons entrusted with installing, mounting, starting
up and operating the product who possess the appropriate qualifications for
their work.
This includes people who meet at least one of these three requirements:
SKnowledge of the safety concepts of automation technology is a require
ment and as project personnel, you must be familiar with these concepts.

Safety instructions
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SAs 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.
SAs commissioning engineers or service engineers, you have successfully
completed the training to repair the automation systems. Moreover, you are
authorized to start up, ground and label circuits and equipment in
accordance with safety engineering standards.
During use, compliance with the legal and safety requirements for the relevant
application is also essential. The same applies to the use of accessories.
The force transducer may only be installed by qualified personnel, strictly in
accordance with the specifications and with the safety requirements and
regulations.

Markings used
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2 Markings used
2.1 The markings used in this document
Important instructions for your safety are highlighted. It is essential to follow
these instructions to prevent accidents and damage to property.
Symbol Meaning
WARNING This marking warns of a potentially dangerous situa
tion in which failure to comply with safety require
ments may result in death or serious physical injury.
CAUTION This marking warns of a potentially dangerous
situation in which failure to comply with safety
requirements may result in minor to moderate
physical injury.
Notice This marking draws your attention to a situation in
which failure to comply with safety requirements may
result in damage to property.
Important
This marking draws your attention to important
information about the product or about handling the
product.
Tip
This marking indicates tips for use or other
information that is useful to you.
Information
This marking draws your attention to information
about the product or about handling the product.
Emphasis
See …
Italics are used to emphasize and highlight text and
identify references to chapters, diagrams, or external
documents and files.

Scope of supply and equipment variants
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3 Scope of supply and equipment variants
SC11 force transducer
SC11 installation instructions
STest record

General instructions for use
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4 General instructions for use
Force transducers are suitable for measuring compressive forces. They
provide highly accurate static and dynamic force measurements and must
therefore be handled very carefully. Particular care must be taken when
transporting and installing the devices. Dropping and knocking the transducer
may cause permanent damage.
C11 series force transducers have a convex force application part, to which the
forces to be measured must be applied.
Chapter10 „Specifications“, page 18 lists the permissible limits for mechanical,
thermal and electrical stress. It is essential to observe these limits when plan
ning the measuring set-up, during installation and, ultimately, during operation.

Structure and mode of operation
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5 Structure and mode of operation
5.1 Transducer
The measuring body is a steel loaded member on which strain gages (SG) are
installed. The influence of a force deforms the measuring body,so there is
deformation in places where the strain gages are installed. The SG are
attached so that two are extended and two are shortened. The strain gages are
wired to form a Wheatstone bridge circuit. They change their ohmic resistance
in proportion to their change in length and so unbalance the Wheatstone
bridge. If there is an excitation voltage, the circuit produces an output signal
proportional to the change in resistance and thus also proportional to the
applied force. The strain gage arrangement is chosen to compensate, as much
as possible, for parasitic forces and moments (e.g. lateral forces and torques),
as well as the effects of temperature.
5.2 Strain gage covering agent
The force transducers have thin cover plates attached to the base to protect
the SGs. In combination with the integrated cable, the steel versions achieve
equipment protection level IP64. In order to retain the protective effect, these
plates must not be removed or damaged in any way.

Conditions on site
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6 Conditions on site
C11 series force transducers are made of rustless materials. It is nevertheless
important to protect the transducers from weather conditions such as rain,
snow and ice, and salt water.
6.1 Ambient temperature
The effects of temperature on the zero signal and on sensitivity are
compensated.
To obtain optimum measurement results, comply with the nominal (rated)
temperature range. The strain gage arrangement results in extreme
insensitivity to temperature gradients, due to the construction (radially
symmetric shear force transducer). Nevertheless, constant or very slowly
changing temperatures are best. A radiation shield and all-round thermal
insulation produce noticeable improvements. However, they must not be
allowed to set up a force shunt, i.e. slight movement of the force transducer
must not be prevented.
6.2 Moisture and corrosion protection
The force transducers are hermetically encapsulated and are therefore
insensitive to moisture under normal operating conditions. Despite the careful
encapsulation, it makes sense to protect the transducers against permanent
exposure to moisture.
The force transducer must be protected against chemicals that could attack the
steel.
With stainless steel force transducers, note that acids and all materials which
release ions will in general 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 provided.

Conditions on site
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6.3 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate
sufficiently to conduct any of the measuring force around the transducer, thus
invalidating the measured value (force shunt).

Mechanical installation
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7 Mechanical installation
7.1 Important precautions during installation
SHandle the transducer with care.
SComply with the requirements for the structural elements connected to the
sensor, as specified in chapter 7.2.
SWelding currents must not be allowed to flow through the transducer. If
there is a risk that this might happen, you must use a suitable low-ohm
connection to electrically bypass the transducer. HBM offers the highly
flexible EEK ground cable in various lengths for this purpose, which can be
screwed on above and below the transducer.
SMake sure that the transducer is not 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,as well as for people in the vicinity.
Implement appropriate safeguards to avoid a force overshoot (see also
section 10 "Specifications", page 18) or to protect against any dangers that
may result.
7.2 General installation guidelines
The forces to be measured must act on the transducer as accurately as
possible in the direction of measurement. Torques, bending moments resulting
from lateral force, eccentric loading and the lateral forces themselves, may
produce measurement errors and destroy the transducer, if limit values are
exceeded.

Mechanical installation
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Notice
When installing and operating the sensor, make sure that there is no extreme
misalignment or eccentric force application.
Load is applied via the spherical load button on top of the force transducer.
The structural component that applies the force to the convex load application
part must be ground and have a hardness of at least 40 HRC.
The substructure must be capable of absorbing the force to be measured.
Remember that the rigidity of the overall system depends on the stiffness of
the force application part and the substructure. Please also note that the
substructure must ensure that force always has to be applied to the transducer
vertically, i.e. there must be no inclination, even under full load.

Electrical connection
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8 Electrical connection
The C11 is a force transducer that outputs a mV/V signal based on strain
gages. An amplifier is needed to condition the signal. All DC amplifiers and
carrier-frequency amplifiers designed for SG measurement systems can be
used.
The force transducers are executed in a four-wire circuit.
Measurementsignal (+) green
Input (+) red
Measurement signal (-) white
Input (-) black
Cable shield
Fig. 8.1 Pin assignment and color code C11
If you need to extend the cable, this should be done using a 6-wire
configuration, so that the cable extension has no influence on the measure
ment result. The 6-wire circuit regulates the cable resistances, allowing the
measurement system to work independently of the connection cable length and
any variations of measuring lead temperature.Only use low-capacitance,
shielded measurement cables as extension cables. A perfect electrical
connection with low contact resistance is essential, and the cable shield must
continue to be extensively connected.
Note that the equipment protection level of your force transducer will decrease
if the cable connection is not tight and water can penetrate the cable.
Transducers with an integrated cable can be irreparably damaged and fail
under these circumstances.
The connection cable shield is connected to the transducer housing.

Electrical connection
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8.1 EMC protection
Electrical and magnetic fields can often induce interference voltages in the
measuring circuit. Pay attention to the following points to avoid this:
SOnly use shielded, low-capacitance measurement cables for extensions
(HBM measurement cables fulfill these conditions).
SDo not route the measurement cable parallel to power lines and control
circuits. If this is not possible, protect the measurement cable with metal
tubing.
SAvoid stray fields from transformers, motors and contact switches.
SDo not ground transducers, amplifiers and indicators more than once.
SConnect all the devices in the measuring chain to the same protective
conductor.
SAlways connect the cable shield extensively on the amplifier side and on the
transducer side, to create the best possible Faraday cage.

Ordering numbers
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9 Ordering numbers
Ordering numbers Measurement range
1-C11/50N-3 50 N
1-C11/100N-3 100 N
1-C11/200N-3 200 N
1-C11/500N-3 500 N
1-C11/1kN-3 1 kN
1-C11/2kN-3 2 kN

Specifications
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10 Specifications
Nominal (rated) force Fnom N 50 100 200 500
kN 1 2
Accuracy
Accuracy class 0.5
Repeatability in an
unmodified mounting
position
brg % 0.3
Relative reversibility
error
v%0.3
Relative creep dcrf+E % 0.3
Temperature coefficient
of zero signal TC0%/10K 0.5
Temperature coefficient
of sensitivity TCS%/10K 0.5
Rated electrical output
Rated output (nominal) Cnom mV/V >1.4
zero signal deviation ds,0 mV/V 2
Input resistance RiΩ350 ±2.5 %
Output resistance RoΩ350 ±2.5 %
Operating range of the
supply voltage Bu,gt V 1….7
Reference supply
voltage
Uref V5
Electrical connection 4-wire circuit
Temperature
Reference temperature t.ref
°C
23
Nominal (rated)
temperature range
Bt,nom 20…+100
Operating temperature
range
Bt,g 20…+120
Storage temperature
range
Bt,S 20…+120