HBM KDB User manual
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Manuel d'emploi | Istruzioni per l'uso |
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KDB
Hottinger Baldwin Messtechnik GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. +49 6151 803-0
Fax +49 6151 803-9100
www.hbm.com
Mat.: 7-2001.4785
DVS: A04785_01_YCI_02 HBM: public
10.2019
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.
保留变更的权利。
所有信息都是对我品的般性描述。在性能或者耐性方
它并提保证。
Operating Manual | Bedienungsanleitung |
Manuel d'emploi | Istruzioni per l'uso |
English Deutsch Français Italiano
KDB
2A04785_01_YCI_02 HBM: public KDB
English
1 Safety instructions 4........................................
2 Markings used 8............................................
2.1 The markings used in this document 8..........................
3 Scope of supply and equipment variants 9...................
3.1 Scope of supply 9............................................
3.2 Accessories 9...............................................
4 General application instructions 10...........................
5 Structure and mode of operation 11...........................
5.1 Force transducer operation 11..................................
5.2 SG covering agent 12.........................................
6 Conditions on site 13........................................
6.1 Ambient temperature 13.......................................
6.2 Moisture and corrosion protection 13............................
6.3 Deposits 13..................................................
7 Mechanical installation 14....................................
7.1 Important precautions during installation 14......................
7.2 General installation guidelines 15...............................
7.3 Using the KDB with pressure plates
(included in the scope of supply) 15.............................
7.4 Using the KDB with the ZL load button 16........................
7.5 Using the KDB with the ZL load button and EPO thrust piece 16....
8 Electrical connection 17......................................
8.1 Connection in a six-wire configuration 17.........................
8.2 Cable shortening or extension 17...............................
8.3 Connection in a four-wire configuration 18........................
8.4 Parallel connection of individual measuring circuits 18.............
8.5 EMC protection 18............................................
Safety instructions
4A04785_01_YCI_02 HBM: public KDB
1 Safety instructions
Intended use
Force transducer in the KDB type series is designed solely for measuring static
and dynamic compressive forces within the load limits stated in the
specifications. Any other use is not the designated use.
To ensure safe operation, the regulations in the mounting and operating
instructions, together with the following safety rules and regulations, and the
data specified in the technical data sheets, must be complied with. It is also
essential to observe the applicable legal and safety regulations for the
application concerned.
The 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 transport,correct storage, setup
and mounting, and careful operation.
Load carrying capacities
The information in the technical data sheets must be complied with 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 limit forces
SBreaking forces
SPermissible dynamic loads
STemperature limits
SLimits of electrical load-carrying capacity
Please note that when several force transducers are interconnected, the load/
force distribution is not always uniform, so an individual force transducer may
be overloaded even though the cumulative signal has yet to reach the sum of
the nominal (rated) forces of the sensors connected in parallel.
Safety instructions
KDB A04785_01_YCI_02 HBM: public 5
Use as a machine element
Force transducers can be used as machine elements. When used in this
manner, it must be noted that, to favor greater sensitivity, the force transducers
were not designed with the safety factors usual in mechanical engineering.
Please refer here to the section "Load-carrying capacities" and to the
specifications.
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. This
applies in particular to transport and mounting
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 property,the user must take appropriate
additional safety precautions that meet at least the requirements of applicable
safety and accident prevention regulations (e.g. automatic emergency shut
down, overload protection, catch straps or chains, or other fall protection). The
electronics conditioning the measurement signal should be designed so that
measurement signal failure does not subsequently cause damage.
General dangers of failing to follow the safety instructions
Force transducers are state-of-the-art and failsafe. There may be dangers in
volved if the transducers are mounted, set up, installed 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 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
Safety instructions
6A04785_01_YCI_02 HBM: public KDB
(safety and accident prevention regulations of the Employers' Liability Insur
ance Association) when using the force transducers.
Force transducers can break, particularly if overloaded. 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 transducer may fail or malfunction,
with the result that persons or property may be affected (due to the loads act
ing 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. In addition, equipment planners, install
ers and operators should plan, implement and respond to the safety engineer
ing considerations of force measurement technology in such a way as to mini
mize 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
KDB force transducers are maintenance-free.
Disposal
In accordance with national and local environmental protection, material recov
ery 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.
Safety instructions
KDB A04785_01_YCI_02 HBM: public 7
Qualified personnel
Qualified personnel means persons entrusted with installing, 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:
1. Knowledge of the safety concepts of automation technology is a require
ment and as project personnel, you must be familiar with these concepts.
2. As automation plant operating personnel, you have been instructed how to
handle the machinery.
3. You are familiar with the operation of the equipment and technologies de
scribed in this document.
4. As commissioning engineers or service engineers, you have successfully
completed the training to repair the automation systems. You are also au
thorized to operate, 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 ap
plication concerned 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 technical data and safety requirements and regulations.
Markings used
8A04785_01_YCI_02 HBM: public KDB
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 can result in death or serious physical injury.
CAUTION This marking warns of a potentially dangerous
situation in which failure to comply with safety
requirements can result in slight or moderate physical
injury.
Notice This marking draws your attention to a situation in
which failure to comply with safety requirements can
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 in
formation that is useful to you.
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
KDB A04785_01_YCI_02 HBM: public 9
3 Scope of supply and equipment variants
3.1 Scope of supply
SKBD force transducer
SKBD mounting instructions
STest record
SBall grips for handling
S2 pressure plates to EN 12390 for reducing surface pressure
S2 centering pins for aligning the compression plates on the measuring body
S1 centering pin with M12 for aligning the ZL load button (1-C6/500T/ZL)
3.2 Accessories
Information
The following accessories are not included among the items supplied!
Ordering number
K-CAB-F Configurable connection cable with bayonet locking for
connecting the force transducer to the bridge amplifier.
Choose cable type 157.
1-KAB157-3 Connection cable KAB157-3; IP67 (with bayonet locking),
3 m long, outer sheath TPE, 6x0.25 mm2, free ends,
shielded, external diameter 6.5 mm
1-C6/500T/ZL Ball-shaped load button
1-EPO3/500T Thrust piece (for use in combination with the domed load
application C6/500T/ZL)
On request KDB connection box for connecting four individual bridges in
parallel
On request Transport box
General application instructions
10 A04785_01_YCI_02 HBM: public KDB
4 General application instructions
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 or knocking the transducer
may cause permanent damage.
The permissible limits for mechanical, electrical and thermal stress are listed in
in section 9 "Specifications" on page 20. It is essential to take these limits into
account when planning the measuring set-up, during installation and,
ultimately, during operation.
The sensor is suitable for checking material testing machines for concrete in
accordance with EN12390 and meets the requirements of DIN 51302-2.
The force transducer also meets the conditions of ISO376, class 0.5 and can
therefore also be used as a reference transducer (transfer measurement
device). With centered load application the sensor can be loaded up to 3 MN.
In this case we recommend using thrust piece ZL (see section 3.2
"Accessories", page 9)
Structure and mode of operation
KDB A04785_01_YCI_02 HBM: public 11
5 Structure and mode of operation
5.1 Force transducer operation
The measuring element is a steel loaded member to which strain gages (SGs)
are applied. The SG installations consist of four full bridge circuits offset by 90°
and pasted onto the loaded member. The SGs for each measuring circuit are
installed so that two are stretched and two are compressed when a force acts
on the transducer. Each strain gage changes its ohmic resistance in proportion
to its change in length and so misaligns the Wheatstone bridge. If bridge exci
tation voltage is present, the circuit produces an output signal proportional to
the change in resistance and thus also proportional to the applied force.
The alignment of the individual measuring bridges is indicated externally by
marks and numbers on the strain cylinder itself.The matching connector plug
has the same number.
The arrangement of the SGs meets the requirements of EN12390. The KDB
strain cylinder can be used to check centric force application, the free move
ment of the upper pressure plates and blocking of the pressure plates' ball
bearings.
The four measuring bridges can be connected in parallel. Then the KDB can be
used as a reference sensor which meets the requirements of at least class 0.5
per ISO376.
Structure and mode of operation
12 A04785_01_YCI_02 HBM: public KDB
Measurementpoint 4
Measurement point 4
Measurement point 2
Measurement
point 1
Measurement point 1
Measurement point 3
Measurement point 3
Full bridge strain gage
Full bridge strain gage
Fig. 5.1 Installation of the 4 SG full bridges on the circumference of the measuring
body
5.2 SG covering agent
To protect the SG the force transducers have a housing that is screwed to
gether with the loaded member. In order to retain the protective effect, the
housing must not be removed or damaged in any way.
Conditions on site
KDB A04785_01_YCI_02 HBM: public 13
6 Conditions on site
Protect the transducer from weather conditions such as rain, snow, ice, and
salt water.
6.1 Ambient temperature
The temperature coefficient of zero signal and sensitivity are compensated. To
obtain optimum measurement results, you must comply with the nominal
(rated) temperature range.
Because of its structure, the arrangement of the SGs is sensitive to tempera
ture gradients. Temperatures that are constant and at best slowly changing
have a favorable effect on accuracy. After significant temperature changes
(moving from cold areas into warm areas, etc.) we recommend waiting long
enough for the sensor to reach thermal equilibrium.
6.2 Moisture and corrosion protection
The force transducers are encapsulated and are therefore insensitive to
moisture. Series KDB force transducer provide degree of protection IP64 and
are made of rustless materials.
With stainless steel force transducers, please note that acids and all materials
which release ions will also attack stainless steels. Any resulting corrosion
could cause the force transducer to fail. In this case, appropriate means of
protection must be provided.
We recommend protecting the transducer against long-term exposure to
moisture and weather conditions.
6.3 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate
sufficiently to divert some of the measuring force, thus invalidating the
measured value (force shunt).
Mechanical installation
14 A04785_01_YCI_02 HBM: public KDB
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 provide 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 very greatly 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. The maximum possible mechanical loads,
especially the breaking force, are noted in the specifications.
When installing and operating the transducers, please note the maximum
parasitic forces - lateral forces, bending and torsional moments; see the
specifications and the maximum permissible loading capacity of the force
application parts used.
Please note that loads up to 3 MN always require centered force application!
Mechanical installation
KDB A04785_01_YCI_02 HBM: public 15
WARNING
If the strain cylinder is overloaded eccentrically (extremely inclined force appli
cation, force application point very far outside of center) there is a risk that due
to one-sided compression of the cylinder the resulting horizontal forces (forces
applied perpendicular to the measurement direction of the KDB) will exceed the
friction forces resulting from the force applied in the measurement direction.
This could cause the strain cylinder to suddenly shoot out of the test chamber.
7.2 General installation guidelines
If the sensor is used as a reference sensor, the forces being measured must
act on the transducer precisely in the measurement direction. Torques and
bending moments, eccentric loading and lateral forces may produce measure
ment errors and destroy the transducer if limit values are exceeded. We
recommend using load button 1-C6A/500T/ZL for measurements of this type.
When used as a strain cylinder to check concrete testing machines in ac
cordance with EN12390, the sensor must be installed in the testing machine as
specified in this standard. HBM recommends dealing with this standard before
using the KDB.
7.3 Using the KDB with pressure plates
(included in the scope of supply)
Pressure plates are suitable for reducing the surface pressure to less than
200 N/mm² with a load of 2MN. This meets the requirements of EN 12390.
Place the pressure plates on the transducer to do this. There are two centering
bores on the two load applications of the sensor. Two corresponding centering
pins are included with delivery.
Mechanical installation
16 A04785_01_YCI_02 HBM: public KDB
7.4 Using the KDB with the ZL load button
The ZL load button is suitable for preventing torques, bending moments and
obliqueness from being applied to the sensor. Use the load button when you
have to perform force calibrations (measuring the total force) with the KDB.
Place the load button on the top of the sensor in the center. A centering bore in
the sensor and a thread bore in the load button are used for exact alignment.
The required centering pin with thread is included with delivery.
The load button ensures centered load application and the sensor can be used
up to 3 MN.
7.5 Using the KDB with the ZL load button and EPO thrust
piece
If you use the load application cited above, bending moments, forces applied at
an angle and torques will not be directed into the sensor. The EPO also re
duces the surface pressure in comparison to an installation situation in which
only the ZL load button is used. We recommend this combination when using
the KDB as a reference force transducer, since centered force application and
compensation for any parallelism error is ensured.
In this way the sensor can be used up to 3 MN.
Electrical connection
KDB A04785_01_YCI_02 HBM: public 17
8 Electrical connection
Amplifiers designed for strain gage systems can be used for measurement
signal conditioning. Carrier frequency can also be connected to DC amplifiers.
If you have to check testing machines in accordance with EN 12390, connect
each of the four measuring bridges to a check of an amplifier system.
If you would like to use the KDB to determine total force, connect all the
measuring bridges in parallel.
The KDB force transducer is delivered with six-wire configuration and is
available with the following electrical connections:
SBayonet connector: plug-compatible with the MIL-C-26482 series 1
connection (PT02E10-6P); IP67
8.1 Connection in a six-wire configuration
With this cable assignment, the output voltage at the measuring amplifier is
positive in the tensile direction when the transducer is loaded.
The cable shield is connected with the transducer housing. This produces a
Faraday cage which covers the sensor, the cable and – provided it is correctly
wired – the plug to the amplifier, thus ensuring optimum safety, even in the
critical EMC environment.
Only use plugs that meet EMC guidelines. The shielding must be connected
extensively. With other connection techniques, an EMC-proof shield should be
applied in the stranded wire area and this shielding should also be connected
extensively (also see HBM Greenline Information).
8.2 Cable shortening or extension
We cannot recommend the extension of the connection cable. HBM offers
cables in various lengths (including mounted plug for sensor and amplifier). For
precise results we recommend calibrating with the cables that will actually be
used for the application.
Electrical connection
18 A04785_01_YCI_02 HBM: public KDB
8.3 Connection in a four-wire configuration
When transducers in a six-wire configuration are connected to amplifiers in a
four-wire configuration, the sense leads of the transducers must be connected
to the corresponding excitation voltage leads: marking (+) with (+) and marking
(-) with (-). This measure also reduces the cable resistance of the excitation
voltage leads. If you use an amplifier with a 4-wire circuit, the output signal and
the temperature dependence of the output signal (TCS) depend on the length
of the cable and the temperature. If you use the 4-wire circuit as described
above, this will result in slightly higher measurement errors. An amplifier
system working with a 6-wire circuit ensures perfect compensation for these
effects.
If you are using the sensor with a 4-wire configuration, it is essential to
consider this in the calibration.
8.4 Parallel connection of individual measuring circuits
The four measuring circuits can be connected in parallel to use the sensor as a
reference force transducer. HBM calibration is performed with the measuring
circuits connected in parallel.
A wiring box can be ordered from HBM for parallel connections. You can also
implement a parallel connection without this box. To do this connect the identi
cal connections of the individual Wheatstone bridges with each other.
Since you have connected the measuring bridges electrically, the input re
sistance drops to about 175 ohms. The amplifier system must be suitable for
this. (minimum requirement: 160 ohms)
8.5 EMC protection
Electrical and magnetic fields can often induce interference voltages in the
measuring circuit. Therefore please note the following:
SUse shielded, low-capacitance measurement cables only (HBM cables fulfill
both conditions).
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