HBM Z8 Manuale utente
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Force transducer
Z8
Mounting instructions
A3764-1.0_en/de
Z8
2 A3764-1.0_en/de
English
1 Safety instructions 3........................................
2 Scope of supply 6..........................................
3 Application information 7...................................
4 Structure and mode of operation 8...........................
4.1 Measuring element 8.........................................
4.2 Housing 8..................................................
5 Conditions on site 9........................................
5.1 Ambient temperature 9.......................................
5.2 Moisture 9..................................................
5.3 Deposits 10..................................................
6 Mechanical installation 10....................................
6.1 Important measures for installation 10...........................
6.2 General installation guidelines 11...............................
6.3 Installation for tensile loading/compressive loading 12.............
6.3.1 Installation 12................................................
6.3.2 Measuring direction, preferred direction, load direction 12..........
7 Electrical connection 14......................................
7.1 Instructions for cabling 14......................................
7.2 Connecting several transducers in parallel 16.....................
8 Specifications (VDI/VDE2638) 17..............................
9 Dimensions 18..............................................
10 Declaration of conformity 19.................................
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1 Safety instructions
Use in accordance with the regulations
Force transducers are designed for force measurements
on test benches/mounting or test devices and general
laboratory applications. Use for any additional purpose
shall be deemed to be not in accordance with the regula
tions.
In the interests of safety, the transducer should only be
operated as described in the Mounting Instructions. It is
also essential to observe the appropriate legal and safety
regulations for the application concerned during use. The
same applies to the use of accessories.
The transducer is not a safety element within the mean
ing of its use as intended. Proper and safe operation of
this transducer requires proper transportation, correct
storage, assembly and mounting and careful operation
and maintenance.
General dangers of failing to follow the safety
instructions
The Z8 force transducer corresponds to the state of the
art and is fail‐safe.
The transducers can give rise to remaining dangers if
they are inappropriately installed and operated by un
trained personnel.
Everyone involved with the installation, commissioning,
maintenance or repair of a force transducer must have
read and understood the Mounting Instructions and in
particular the technical safety instructions.
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Remaining dangers
The scope of supply and performance of the transducer
covers only a small area of force measurement tech
nique. In addition, equipment planners, installers and op
erators should plan, implement and respond to the safety
engineering considerations of force measurement tech
nique 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 con
nected with force measurement technique.
In these mounting instructions remaining dangers are
pointed out using the following symbols:
WARNING
Meaning: Dangerous situation
Warns of a potentially dangerous situation in which fail
ure to comply with safety requirements can result in
death or serious physical injury.
CAUTION
Meaning: Possibly dangerous situation
Warns of a potentially dangerous situation in which fail
ure to comply with safety requirements could lead to
damage to property, slight or moderate physical injury.
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Note
Means that important information about the product or its
handling is being given.
Meaning: CE mark
The CE mark signals a guarantee by the manufacturer
that his product meets the requirements of the relevant
EC directives (see Declaration of conformity at the end of
this Operating Manual).
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. Mounting
and dismounting the adapter in accordance with
Chapter 6 excluded.
Qualified personnel
This instrument is only to be installed by qualified person
nel strictly in accordance with the technical data and with
the safety rules and regulations which follow. It is also
essential to observe the appropriate legal and safety reg
ulations for the application concerned. The same applies
to the use of accessories.
Qualified personnel means persons entrusted with the
installation, fitting, commissioning and operation of the
product who possess the appropriate qualifications for
their function.
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Conditions on site
Protect the transducer from damp and weather influ
ences such as rain, snow, etc.
Maintenance
The Z8 force transducer is maintenance free.
Accident prevention
Although the specified nominal force in the destructive
range is several times the full scale value, the relevant
accident prevention regulations from the trade associ
ations must be taken into consideration.
2 Scope of supply
S1 Z8 force transducer with a permanently mounted
connection cable
S1 operating manual Z8
STest protocol
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3 Application information
The transducers are fixed and loaded as cantilever
beams. The specified sensitivity tolerance applies for
loading in the preferred measuring direction (arrow V in
Fig. 6.1). But you can also measure in the opposite direc
tion, e.g. for alternating load. In accordance with their
intended application, the transducers are calibrated as
force‐proving instruments in units of force.
The force transducers measure dynamic loading just as
exactly as static loads. The high spring rates (small
amounts of travel) of the transducers are a particular ad
vantage here.
As they are precision measuring devices, force trans
ducers need to be handled carefully during transportation
and mounting, as knocking or dropping the transducers,
for example, can permanently damage them. Sudden
load changes (e.g. load applied in ”free fall”) in measur
ing mode can also cause an unexpected overload with
lasting damage. Where it is not possible to exclude this
type of sudden load change with certainty, they have to
be intercepted.
HBM force transducers are maintenance free and can
even be mounted in places where access is difficult.
Their electrical measurement signals can be transmitted
to remote measuring points and stations where they can
be displayed, recorded and used for control tasks.
Because of the open transducer mounting, you should
keep to the permitted field of application. The transducer
should not be operated under rough conditions or in a
corrosive atmosphere. The conditions of use can be
found in the specified climatic utilization category
(see section 5.2).
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The limits for the permissible mechanical thermal and
electrical stresses are stated in the Specifications. It is
absolutely essential to comply with them. Please take
this into account when planning the measuring set‐up,
during installation and finally, during operation.
4 Structure and mode of operation
4.1 Measuring element
The measuring element is a measuring spring made from
a high‐strength aluminum alloy, to which two half bridge
strain gages (S.G.s) have been applied. For the Z8 trans
ducers, the shape of the measuring spring that is used is
a double bending beam. The S.G.s are arranged so that
two of them are extended and the other two are com
pressed when the measuring spring is loaded in the
measuring direction. A cover protects the S.G.s from
moisture. The user must take suitable measures to en
close the transducer to protect it against corrosive media.
Force shunts must be avoided here.
4.2 Housing
The anodized aluminum housing is pushed over the
measuring element, open towards the load introduction
side and closed by the measuring element at the other
end. It protects the S.G. application against mechanical
stresses.
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5 Conditions on site
5.1 Ambient temperature
The influence of temperature on the measurement signal
is compensated.
To achieve optimal measurement results the nominal
temperature range must be maintained. Temperature‐in
duced measurement errors are caused by heating (e.g.
radiant heat) or cooling on one side. A radiation shield
and all‐round thermal insulation will produce a marked
improvement, but should not form a force shunt.
The ambient pressure (in air) has no effect on the meas
urement accuracy
5.2 Moisture
Climatic utilization category HSF in accordance with DIN
40040 states that the transducer can be operated in an
operating temperature range of ‐25 °C to +70 °C. The
humidity loading in the average annual temperature must
not exceed 75%. On 30 days, distributed over the year,
the maximum value of the sustained relative humidity of
air can be 95%, on the remaining days, a mere 85%.
Transducer condensation is not permitted.
Note
Moisture must not be allowed to penetrate the free end of
the connection cable or the pressure compensation hole.
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5.3 Deposits
Dust, dirt and other foreign bodies must not be allowed to
accumulate such that they divert part of the measured
force onto the housing and so falsify the measured value
(force shunt).
6 Mechanical installation
6.1 Important measures for installation
STreat the transducer gently. When handling and
mounting, no forces and moments worth mentioning
should be directed over the sensitive precision meas
uring element below the aluminum housing.
STransducers with nominal loads 50N and 100N are by
nature very vulnerable to overloads and should there
fore always be handled particularly carefully.
SThe base must be inflexible against the intended
loads.
SThe transducer seating must be totally flat and - just
like the transducer mounting surface - be absolutely
clean.
SThe transducer seating must be totally flat and - just
like the transducer mounting surface - be absolutely
clean.
SDo not overload the transducers, not even temporar
ily, for example by unevenly distributed bearing loads.
SAbove all, when there are more than three trans
ducers (statically indeterminate storage) get the load
introduction points on one level. With a central load
Indice
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