HBM CFT+ Series User manual

Operating Manual | Bedienungsanleitung |
Manuel d'emploi | Istruzioni per l'uso | 操说明
English Deutsch Français Italiano 文
CFT+

Hottinger Baldwin Messtechnik GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com
Mat.: 7-0111.0002
DVS: A05101_01_YCI_02 HBM: public
03.2019
EHottinger Baldwin Messtechnik GmbH.
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.
Con riserva di modifica.
Tutti i dati descrivono i nostri prodotti in forma generica e non
implicano alcuna garanzia di qualità o di durata dei prodotti
stessi.
变更权利。
所有息是对我品性描。在性或性方
它并提。

Operating Manual | Bedienungsanleitung |
Manuel d'emploi | Istruzioni per l'uso | 操说明
English Deutsch Français Italiano 文
CFT+

2A05101_01_YCI_02 HBM: public CFT+
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...................
3.1 Accessories 8...............................................
4 General application instructions 9...........................
5 Structure and mode of operation 10...........................
5.1 Force transducer operation 10..................................
6 Conditions on site 12........................................
6.1 Ambient temperature 12.......................................
6.2 Moisture and corrosion protection 12............................
7 Mechanical installation 13....................................
7.1 Important precautions during installation 13......................
7.2 General installation guidelines 14...............................
7.3 Force transducer installation 16.................................
7.3.1 Mounting with flange connection 16.............................
7.3.2 Mounting via the central fine thread 18...........................
7.3.3 Mounting with threaded bushing 19..............................
8 Electrical connection 21......................................
9 Specifications 22............................................
10 Dimensions 24..............................................

Safety instructions
CFT+ A05101_01_YCI_02 HBM: public 3
1 Safety instructions
Intended use
Piezoelectric force transducer in the CFT+ type 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 technical data sheets. It is also essential to observe the appli
cable 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
Comply with the information in the technical data sheets when using 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
SLateral force limits
SBreaking forces
SMaximum eccentricity
SPermissible dynamic loads
STemperature limits
Please note that when several force transducers are interconnected, the load/
force distribution is not always uniform. This means that one particular force
transducer may be overloaded even if the total of all the nominal (rated) force
for all sensors has not been reached.

Safety instructions
4A05101_01_YCI_02 HBM: public CFT+
Use as machine elements
Force transducers can be used as machine elements. Note also the "Load-
carrying capacity limits" section and the specifications to ensure the required
overload limit of your application.
Accident prevention
The prevailing accident prevention regulations must be taken into account,
even though the breaking force is 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 ac
cident prevention regulations (e.g. automatic emergency shutdown, overload
protection, catch straps or chains, or other fall protection).
The electronics conditioning the measurement signal should be designed so
that measurement signal failure cannot subsequently cause damage.
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 inap
propriately or by untrained personnel. Every person involved with setting up,
starting up, operating or repairing a force transducer must have read and un
derstood the mounting instructions and in particular the technical safety in
structions. 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 when using the force transducers. A force transducer can break,
particularly in the case of overload. The breakage of a force transducer can
cause damage to property or injury to persons in the vicinity of the force trans
ducer.

Safety instructions
CFT+ A05101_01_YCI_02 HBM: public 5
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
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 piezoelectric
force transducers 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. Comply with
pertinent national and local regulations.
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 CFT+ series are maintenance free.
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 need 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 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 these three requirements:

Safety instructions
6A05101_01_YCI_02 HBM: public CFT+
SYou know about the safety concepts of automation and as project person
nel, are familiar with these concepts.
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 system startup engineers or service engineers, you have successfully
completed the training to qualify you to repair the automation systems.
Moreover, you are authorized to start up, ground and label circuits and
equipment in accordance with safety engineering standards.
It is also essential to comply with the legal and safety requirements for the rele
vant application during use. 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 regu
lations.

Markings used
CFT+ A05101_01_YCI_02 HBM: public 7
2 Markings used
2.1 The markings used in this document
Important instructions for your safety are specifically identified. It is essential to
follow these instructions in order 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 situa
tion in which failure to comply with safety require
ments may result in slight or 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 infor
mation about the product or about handling the prod
uct.
Tip
This marking indicates tips for use or other informa
tion 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 sections, diagrams, or external
documents and files.

Scope of supply and equipment variants
8A05101_01_YCI_02 HBM: public CFT+
3 Scope of supply and equipment variants
SCFT+ piezoelectric force transducer
SMounting instructions
STest record
SPlug protection
STwo centering rings
SThreaded bushing
3.1 Accessories
The accessories are not included among the items supplied.
Accessories Ordering number
Connection cable for piezoelectric sensors with a 10-32UNF
plug on both sides. Available in different lengths up to 7 m 1-KAB143-x
Connection cable for piezoelectric sensors with a 10-32UNF
plug on both sides. Rugged design, mechanically protected with
a steel spiral on the sensor side. Available in different lengths up
to 7 m
1-KAB145-x
Connection cable for piezoelectric sensors with a 10-32UNF
plug on one side and a BNC plug on the other cable end.
Available in different lengths up to 3 m
1-KAB176-x
Cable coupling to extend piezoelectric connection cables. 10-32
UNF at both ends 1-CCO
Summing box for parallel connection of up to four piezoelectric
sensors to one charge amplifier. Connection sockets: 10-32UNF 1-CSB4/1

General application instructions
CFT+ A05101_01_YCI_02 HBM: public 9
4 General application instructions
Force transducers are suitable for measuring compressive forces. They pro
vide highly accurate static and dynamic force measurements and must there
fore be handled very carefully. Particular care must be taken when transporting
and installing the devices. Dropping or knocking the transducer may cause per
manent damage.
The permissible limits for mechanical, thermal and electrical stress are listed in
section9 "Specifications”, page 22. It is essential to take these limits into
account when planning the measuring set-up, during installation and, ulti
mately, during operation.

Structure and mode of operation
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5 Structure and mode of operation
5.1 Force transducer operation
The force transducers of the CMC+ series operate in accordance with the
piezoelectric principle. Compressive forces are transferred via pre-stressed
force application surfaces onto the two measuring elements made of quartz
(nominal (rated) forces 50 kN, 70 kN and 120 kN) or gallium phosphate (nomi
nal (rated) force 25 kN). They separate the electrical charges in proportion to
the force curve. Charges are produced on the surface of the measuring ele
ments that are forwarded by an electrode between the measuring element and
the sensor housing to the force transducer's male connector. If a charge ampli
fier is connected via a suitable cable, the charge signal can be converted into a
voltage signal or a digital force signal.
Anti-fatiguebolt
Thrust piece
Measuring
elements
Force application surface Clamping device
Housing
Fig. 5.1 Basic layout of CFT+ series force transducers

Structure and mode of operation
CFT+ A05101_01_YCI_02 HBM: public 11
Fig. 5.2 Appearance of CFT+ force transducers
Notice
If you load the sensor with a force, either a charge amplifier has to be con
nected or the inner contact of the plug for connecting the coaxial cable must be
short circuited with the shielding.

Conditions on site
12 A05101_01_YCI_02 HBM: public CFT+
6 Conditions on site
CFT+ force transducers are made of stainless materials. Protect the trans
ducer nevertheless from weather conditions such as rain, snow, ice, and salt
water.
6.1 Ambient temperature
The temperature has very little effect on the output signal. To obtain optimum
measurement results, comply with the nominal (rated) temperature range.
All series CFT+ sensors are mechanically pre-stressed with the corresponding
parts. The pre-stress force depends on the modulus of elasticity of the materi
als being used. Since the modulus of elasticity varies with the temperature, the
pre-stress force also varies with the temperature. The sensor forwards this
variation as a measurement signal to the charge amplifier. If you want to per
form quasi-static measurements (for example adjusting measurement chains),
we recommend bringing the measurement chain to a uniform and constant
temperature.
Please be aware that the drift of a piezoelectric measurement chain may
increase at a higher temperature, as the mobility of the charge carriers rises
with the temperature.
6.2 Moisture and corrosion protection
CFT+ series force transducers meet the conditions of degree of protection
IP65 in accordance with EN 60529, if a connection cable is connected.
With stainless steel force transducers, please note that acids and all materials
which release ions will also attack stainless steels and their seam welds. Any
resulting corrosion could cause the force transducer to fail. In this case,
appropriate means of protection must be provided. Force transducers should
be protected in general against substances that attack stainless steels.

Mechanical installation
CFT+ A05101_01_YCI_02 HBM: public 13
7 Mechanical installation
7.1 Important precautions during installation
SHandle the transducer with care.
SNote the requirements for the force application parts in accordance with the
subsequent sections of these instructions
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 provides the highly
flexible EEK ground cable for this purpose, for example, that is screwed on
above and below the transducer.
SMake sure that the transducer cannot be overloaded.
WARNING
There is a danger of the transducer breaking if it is exposed to heavy force
overshoot. This can cause danger for the operating personnel of the system in
which the transducer is installed.
Implement appropriate safety measures to avoid force overshoots or to protect
against the resulting dangers. The maximum possible mechanical stresses,
especially the breaking force,are noted in the specifications.
When installing and operating the transducers, please note the maximum para
sitic forces - lateral forces, bending and torsional moments; see the specifica
tions and the maximum permissible load-carrying capacity of the force applica
tion parts used.

Mechanical installation
14 A05101_01_YCI_02 HBM: public CFT+
Notice
Piezoelectric sensors may be damaged if they are loaded with forces greater
than 50% of the nominal (rated) force without being connected to a charge am
plifier or short circuited. Please be aware of this if you apply forces to the sen
sor during assembly.
7.2 General installation guidelines
The forces to be measured must act on the transducer as accurately as possi
ble in the direction of measurement.
Bending moments resulting from lateral force, eccentric loading and the lateral
forces themselves, may destroy the transducer if limit values are exceeded.
Please note the limits in the specifications
Please note that you can only make use of a single parasitic load (bending
moments, lateral forces, torques) up to the limits indicated in the specifications
and none of these components occur elsewhere. If lateral forces, bending
moments and torques act on the sensor simultaneously, the components of the
loading when added together must not exceed 100 %
Example 1
You are using 50 % of the allowed lateral force, 25 % of the bending moment
and 25 % of the torque.
50 % + 25 % + 25 % = 100 %
► The sensor is not overloaded and can be operated.
Example 2
You are using 70 % of the allowed lateral force, 25 % of the bending moment
and 25 % of the torque.
70 % + 25 % + 25 % = 120 %
► The sensor is overloaded and must not be operated.

Mechanical installation
CFT+ A05101_01_YCI_02 HBM: public 15
Lateral force
Torque
Bending moment
Eccentric force application
Fig. 7.1 Parasitic loads: Bending moments, lateral forces, torque and eccentric force
application
Information
If the force is not applied in the center of the force transducer, a bending
moment is produced that can be calculated as:
Mb=F*e
where F is the applied force and e is the distance between the force application
point and the center of the force transducer.

Mechanical installation
16 A05101_01_YCI_02 HBM: public CFT+
7.3 Force transducer installation
The force must always be applied via the force application surfaces (see il
lustration below)
Load application surface
Fig. 7.2 The force must always be applied via the load application surface
7.3.1 Mounting with flange connection
The sensor can be used for quasi-static measurements with this type of
mounting. Dynamic loads are acquired correctly. The sensor must not be
exposed to tensile forces. It is not possible to measure tensile forces. The
maximum tensile force can be found in the specifications.
To guarantee minimum measurement uncertainty, the structural elements con
nected to the sensor should exhibit a roughness Ra< 0.8 μm and a hardness
of at least 40 HRC.
The threads are used to screw the force transducer onto the load application
surfaces. The structural element on the customer side (profile, ceiling, plate)
must be sufficiently stiff in design so that there is no misalignment under load
(danger of adequate bending moments). During assembly you can use an
open-ended wrench to prevent the sensor from rotating. (Dimension M) See
the table below for the tightening torque for the screws.

Mechanical installation
CFT+ A05101_01_YCI_02 HBM: public 17
The screws to be used must exhibit property class 12.9.
Nominal
(rated)
force
Centering
diame
terH8
Tighten
ing
torque
Screws
for trans
ducer
mounting
Screws Min.
thread
reach
Max.
thread
reach
kN mm N*m Number mm mm
25 6 1.3 M3 4 2.5 3.5
50 10 2.0 M4 4 3.5 4.5
70 14 4.0 M5 4 4.5 5.5
120 21 21.0 M6 4 7.0 9.0
The transducer is equipped with two centering pieces on the upper and lower
mounting surface for exact positioning (see illustration below). Two centering
rings are included in the scope of supply to allow for internal centering on the
customer side.

Mechanical installation
18 A05101_01_YCI_02 HBM: public CFT+
Flange adapter (customized)
Integrated fine thread
Centering ring (scope of supply)
Flange adapter (customized)
7.3.2 Mounting via the central fine thread
The sensor can be used for quasi-static measurements with this type of
mounting. Dynamic loads are acquired correctly. The sensor must not be ex
posed to any tensile forces with this type of mounting.
Use the fine thread completely and please be sure to observe the torques
specified in the table.
Sensor Thread Mmin [Nm] Mmax [Nm]
CFT+/25kN M5x0.5 1.9 2.1
CFT+/50kN M9x0.5 4 5.5
CFT+/70kN M13x0.5 14 18
CFT+/120kN M19x0.5 35 45