HBM U3 Manual de usuario

Force transducer

Mounting Instructions

B 20.U3.20 en

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HBM 11.12.2000

Contents Page

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

1 Scope of supply 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Applicationinformation 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Structure and mode of operation 8. . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Measuring element 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Housing 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Conditionson site 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Ambient temperature 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Moisture 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3 Deposits 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Mechanicalinstallation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 Important measures for installation 10. . . . . . . . . . . . . . . . . . . . . . . . . . .

5.2 General installation guidelines 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.3 Installation for tensile loading/compressive loading 12. . . . . . . . . . . . . .

5.3.1 Installation without adapter 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.3.2 Installation with adapter and knuckle eye 13. . . . . . . . . . . . . . . . . . . . . .

5.3.3 Installation with two knuckle eyes 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Electrical connection 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1 Instructionsfor cabling 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Specifications(VDI/VDE2638) 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8 Dimensions 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9 Declaration of conformity 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Safety instructions

Use in accordance with the regulations

Force transducers in the U3 range are designed for force measurements on

test benches/in press–fit devices/test devices/pressing. Use for any additional

purpose shall be deemed to be not in accordance with the regulations.

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 meaning 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 due to non–observance of the safety instructions

The U3 force transducer corresponds to the state of the art and is fail–safe.

The transducers can give rise to residual dangers if they are inappropriately

installed and operated by untrained 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.

Residual dangers

The scope of supply and performance of the transducer covers only a 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 way as

to minimise residual dangers. Prevailing regulations must be complied with at

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

force measurement technique.

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In these mounting instructions residual dangers are pointed out using the

following symbols:

Symbol: WARNING

Meaning: Dangerous situation

Warns of a potentially dangerous situation in which failure to comply with

safety requirements can lead to death or serious physical injury.

Symbol: ATTENTION

Meaning: Possibly dangerous situation

Warns of a potentially dangerous situation in which failure to comply with

safety requirements could lead to damage to property, slight or moderate

physical injury.

Symbol: NOTE

Refers to the fact that important information is being given about the product

or its use.

Symbol:

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 Mounting Instructions).

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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 removing the adapter in accordance with Chapter 5 excluded.

Qualified personnel

This instrument is only to be installed by qualified personnel 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

regulations 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 U3 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.

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HBM 11.12.2000

1 Scope of supply

•1 U3 force transducer

•1 U3 Operating Manual

Accessories (not included in the scope of supply):

•’complete adapter’for knuckle eye mounting

0.5–10kN: Adapter with four M5x12 and four M5x16 screws

Order no. 2–9289.1956

20kN: Adapter with four M10x25 and four M10x30 screws

Order no. 2–9289.1957

50kN: Adapter with eight M10x25 and eight M10x30 screws

Order no. 2–9289.1958

100kN: Adapter with eight M10x25 and eight M10x30 screws each

Property class 12.9. galvanized Order no. 2–9289.2280

•Knuckle eye ZGUW for 0.5–10kN Order no. 1–U2A/1t/ZGUW

20 kN Order no. 1–U2A/2t/ZGUW

50 kN Order no. 1–U2A/5t/ZGUW

100kN Order no. 1–Z4/100kN/ZGUW

2 Application information

Force transducers of the U3 type series are suitable for measuring tensile and

compressive forces. They measure static and dynamic forces extremely

accurately and therefore require careful handling. You must take particular

care when transporting and installing the devices. If you knock or drop the

transducers, this could permanently damage them.

The housing provides an elaborate seal to protect the sensitive strain gauge

applications and it is essential that this is preserved. You must be particularly

careful with the base of the housing, as this is extremely thin.

The limits for the permissible mechanical thermal and electrical stresses are

stated in the Specifications. It is essential that these are taken into

consideration in planning the measuring set–up, during installation and finally,

during operation.

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3 Structure and mode of operation

3.1 Measuring element

The measuring element is a measuring spring made from stainless steel, to

which strain gauges (S/G) are applied. The S/Gs are arranged so that four of

them can be strained and the other four compressed when the transducer

reacts to a force.

3.2 Housing

The housing with the integrated measuring spring is completed underneath by

an attached base. This base is extremely thin and must not be loaded

centrally (see Page 11). It should be protected against mechanical damage.

Pressure compensation hole

Fig. 3.1 Position of housing base

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4 Conditions on site

4.1 Ambient temperature

The effects of temperature on the zero signal and on the sensitivity are

compensated. To achieve optimal measurement results the nominal

temperature range must be maintained. Temperature–induced measurement

errors are caused by heating (e.g. radiant heat) or cooling on one side. A

radiation barrier and all–round thermal insulation will produce a marked

improvement, but should not form a force shunt.

4.2 Moisture

Extreme humidity or a tropical climate should be avoided if this means that the

classified limit values are exceeded (degree of protection IP65 under DIN

EN 60529).

NOTE:

Moisture must not be allowed to penetrate the free end of the

connection cable or get into the pressure compensation hole.

4.3 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).

NOTE:

Foreign bodies must not be allowed to clog the gap beneath the

flange surface.

Pressure compensation hole

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5 Mechanical installation

5.1 Important measures for installation

•Treat the transducer gently.

•Do not overload the transducer.

•Either during installation or immediately afterwards, the transducer should

be bridged by a 50mm2stranded copper wire (highly flexible signal ground

cable EEK from the HBM line). The cable is attached by screws both above

and below the transducer. This prevents welding current flowing over the

transducer and welding the force introduction point.

WARNING

If there is a risk of breakage through overload on the transducer

and thus a risk to persons, additional safety measures are to be

taken.

5.2 General installation guidelines

The direction of measurement in which the forces work should be as much

towards the transducer as possible. Torsion and bending moments, eccentric

loading and transverse forces may result in measurement errors and if the

limit values are exceeded, could destroy the transducer.

The transducer can take up 100% (80% at 50kN, 50% at 100kN) of its

nominal force as transverse force by reference to a force introduction point on

the force–introduction surface (see diagram Fig. 5.1), without losing its

mechanical competence.

Transverse force

Fig. 5.1 Transverse force introduction

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