HBM Z8 Manuel utilisateur

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Force transducer

Mounting instructions

A3764-1.0_en/de

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.................................

A3764-1.0_en/de 3

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.

4 A3764-1.0_en/de

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.

A3764-1.0_en/de 5

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.

6 A3764-1.0_en/de

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

A3764-1.0_en/de 7

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).

8 A3764-1.0_en/de

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.

A3764-1.0_en/de 9

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.

10 A3764-1.0_en/de

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

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