HBM U2B Manual de usuario

A03823.3en/de/fr

Force transducer

Kraftaufnehmer

Capteur de force

U2B

Montageanleitung

Mounting instructions

Notice de montage

English Page 3 − 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Deutsch Seite 21 − 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Français Page 39 − 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

U2B

HBMA03823.3en/de/fr

Contents Page

Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Instructions for use 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Structure and operating mode 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Measuring device8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Housing 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Measurementprocess, output signal 9. . . . . . . . . . . . . . . . . . . . . . .

2.4 Compensating for disturbance variables9. . . . . . . . . . . . . . . . . . . .

3 Operation on site 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Ambient temperature 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Humidity 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Ambient pressure 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Contamination 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Mechanical installation 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Important precautionsduring installation 11. . . . . . . . . . . . . . . . . . . .

4.2 General installation guidelines11. . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3 U2B installation for tensile loading 12. . . . . . . . . . . . . . . . . . . . . . . . .

4.4 U2B installation for tensile and compressive loading 13. . . . . . . . .

5 Electrical connection 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 Noteson cabling 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.2 Sixwire connection 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.3 Fourwire connection 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Technical Data 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Dimensions 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4U2B

HBM A03823.3en/de/fr

Safety instructions

Use inaccordance withthe regulations

The U2B force transducer is to be used exclusivelyfor force measurement

tasks and directlyrelated control tasks. Use for anyadditional purpose shall

be deemed to be not in accordance with the regulations.

In the interests of safety, the transducer should onlybe operated as described

in the Mounting Instructions. It is also essential to observe the appropriate

legal and safetyregulations for the application concerned during use. The

same applies to the use of accessories.

The transducer is not a safetyelement within the meaning of its use as

intended. Proper and safe operation of this transducer requires proper

transportation, correct storage, assemblyand mounting and careful operation

and maintenance.

General dangers of failing tofollow the safety instructions

The U2B force transducer corresponds to the state of the art and is failsafe.

The transducers can give rise to remaining dangers if theyare inappropriately

installed and operated byuntrained 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 safetyinstructions.

Remaining dangers

The scope of supplyand performance of the transducer covers onlya small

area of force measurement technique. In addition, equipment planners,

installers and operators should plan, implement and respond to the safety

engineering considerations of force measurement technique in such a wayas

to minimise remaining dangers. Prevailing regulations must be complied with

at all times. There must be reference to the remaining dangers connected with

force measurement technique.

U2B

HBMA03823.3en/de/fr

In these mounting instructions remaining dangers are pointed out using the

following symbols:

Symbol: DANGER

Meaning: Maximum danger level

Warns of an imminently dangerous situation in which failure to complywith

safetyrequirements will result indeath or serious physical injury.

Symbol: WARNING

Meaning: Potencially dangerous situation

Warns of a potentially dangerous situation in which failure to complywith

safetyrequirements canresult indeath or serious physical injury.

Symbol: CAUTION

Meaning: Possibly dangerous situation

Warns of a potentially dangerous situation in which failure to complywith

safetyrequirements couldresult indamage to propertyor some form of

physical injury.

Symbol: NOTE

Means that important information about the product or its handling is being

given.

Symbol:

Meaning: CE mark

The CE mark enables the manufacturer to guarantee that the product

complies with the requirements of the relevant ECdirectives (the declaration

of conformityis available at http://www.hbm.com/HBMdoc).

6U2B

HBM A03823.3en/de/fr

Unauthorisedconversions and modifications are prohibited

The transducer must not be modified from the design or safetyengineering

point of viewexcept with our express agreement. Anymodification shall

exclude all liabilityon our part for anydamage resulting therefrom.

Qualifiedpersonnel

These transducers are onlyto be installed and used byqualified personnel,

strictlyin accordance with the technical data and the safetyrequirements and

regulations listed below. It is also essential to observe the appropriate legal

and safetyregulations 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.

Conditions on site

Protect the transducer from damp and weather influences such as rain, snow,

etc.

Maintenance

The U2B 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 associations must be taken into consideration.

U2B

HBMA03823.3en/de/fr

1Instructions for use

The U2B series of force transducers is suitable for measuring tensile forces

and pressures. Theymeasure static and dynamic forces with great accuracy

and therefore require careful handling. Transport and installation of the devi

ces require special attention for the same reason. Transducers can be

permanentlydamaged if knocked or dropped.

These force transducers are manufactured from stainless steel and are suita

ble for use under harsh environmental conditions and severe operating

constraints. Theyare maintenance free and can even be installed in places

that are hard to reach. Their measuring signals can be transmitted to remote

measuring equipment.

The perfect seal that protects the sensitive strain gauge applications has to be

maintained bythe housing in all conditions. The base of the housing must the

refore be treated with special care, since it is verythin.

The permitted limits for mechanical, thermal and electrical loadings are given

in the Technical Data. Please take these points into account whenever

planning for measurement arrangements and when installing or operating the

equipment.

8U2B

HBM A03823.3en/de/fr

2 Structure and operating mode

2.1 Measuring device

The measuring device is a stainless steel measuring spring to which strain

gauges (SG) are applied. The measuring device simultaneouslyforms the

upper part pf the transducer housing (Fig. 2.1). The SGs are arranged so that

four of them are stretched and the other four are compresses when a force is

applied to the transducer. The transducer circuit contains correcting and com

pensating resistors, in order to reject undesirable influences on the zero signal

and sensitivity.

2.2 Housing

The housing with its integral measuring spring is closed bya floor plate wel

ded to its underside. The measuring spring on the force transducer has a

threaded pin which acts as a force conductor. A removable adapter is

screwed to the lower part of the housing and acts as a force conductor via

jointed eyelets (see Section 7).

1=Strain gauges

2=Housing with integral measuring spring

3=Adapter

4=Lock nut

5=Threaded pin for force conductor

6=Glass bushing

7=Cable chest

8=Welded cover

9=Internal thread

Fig.2.1: Schematic diagram: U2B

U2B

HBMA03823.3en/de/fr

2.3 Measurement process, output signal

A force acting upon the transducer will elasticallydeform the SGs applied to

the measuring body. Their electrical resistance then changes in proportion to

the change in their length. This disturbs the balancing of the measurement

system wired in the form of a Wheatstone bridge, resulting in an output vol

tage UAat contacts 1 and 4 if a bridge excitation voltage UBis present at

points 2 and 3 on the bridge.

The ratio between the voltages, UA/UB, expressed in mV/V, is a measure of

the sensitivityof the force transducer. The change in output voltage UAis

linear to the acting force. Provided the force transducer is connected in ac

cordance with Fig. 5.1 and as specified in the User Manual for the amplifier

concerned, compressive forces are displayed with a positive operating sign

and tensile forces are shown with a negative operating sign. The force trans

ducer is electricallyconnected in 6wire mode (see Section 5.2). To reverse

the polarity, the white and red wires in the cable should be transposed.

2.4 Compensating for disturbance variables

The geometryof the measuring bodyand the positioning of the SGs ensure

that the output signal from the transducer suffers onlyminimal distortion if the

force being measured is affected bysuperimposed lateral forces and/or torsio

nal and bending moments. The specifications for this can be found in the

Technical Data. In the interests of greater accuracy, however, it is generally

better to tryto prevent spurious loadings of this kind altogether. The U2B also

has separate lateral force compensation which reduces lateral force influ

ences to a minimum (see Technical Data).

The influence of temperature on the zero signal and sensitivityare compensa

ted. Changes in ambient pressure have the same effect as additive (substrac

tive) forces (see Section 3.3).

10 U2B

HBM A03823.3en/de/fr

3Operation on site

3.1 Ambient temperature

For optimum measurement results, keep to the rated temperature range. The

best conditions are constant or veryslowlychanging temperatures. Measure

ment errors due to temperature are the result of uneven warming (e.g. radiant

heat) or cooling. A radiation shield and allround heat insulation provide noti

ceable improvements. However, theyshould not be allowed to form anykind

of force leakage.

3.2 Humidity

Humidityhave no effect on the measurement capabilityof the transducer, pro

vided theyare within the specified limit values (protection system IP67 in ac

cordance with DINEN60529).

NOTE

Moisture shouldnot be allowedtopenetrate the free end of the connec

tor cable.

3.3 Ambient pressure

Ambient pressure should be between 0 and 5 bar. Please note that changes

of pressure alter the zero point:

Nennlast 20 kN500 N1 kN2 kN5 kN10 kN

Zeropoint modification

[% sensitivity/10 mbar] "0.004 "0.141 "0.071 "0.035 "0.014 "0.007

Nennlast 50 kN100 kN200 kN

Zeropoint modification

[% sensitivity/10 mbar] "0.002

3.4 Contamination

Dust, dirt and other foreign bodies should not be allowed to accumulate to

such an extent that part of the measured force is diverted to the housing so as

to falsifythe measured value (force leakage).

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