HBM U9B Manual de usuario

B 20. U9B.40 en

Force transducer with

strain gauge measuring

system

U9B

Operating manual

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U9B

B 20.U9B.40 en HBM

Contents Page

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

1 Scope of delivery 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Field of application and notes on use 7. . . . . . . . . . . . . . . . . . . . . . .

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

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

3.2 Measuring procedure, output signal 8. . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Conditionsat the site of installation 8. . . . . . . . . . . . . . . . . . . . . . . .

4.1 Ambient temperature 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Humidity 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

4.4 External pressure 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

5.1 Important precautions during installation 10. . . . . . . . . . . . . . . . . . . . . . .

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

5.2.1 Mounting for tensile and compressive loads 10. . . . . . . . . . . . . . . . . . . .

6 Electrical connection 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1 Notes on wiring 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2 Allocation of the cable cores 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.3 Connection technique 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.4 Cable extensions 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.5 Parallel connection of more then one transducers 13. . . . . . . . . . . . . . .

7 Technical data 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8 Dimensions (in mm) 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9 Copy of Declaration of Conformity 16. . . . . . . . . . . . . . . . . . . . . . . . . .

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Safety instructions

Use in accordance with the regulations

Force transducers in the U9B range are designed for measuring static and

dynamic compressive forces. 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 U9B 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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U9B

B 20.U9B.40 en HBM

In these mounting instructions residual dangers are pointed out using the

following symbols:

Symbol: DANGER

Meaning: Highest level of danger

Warns of a directly dangerous situation in which failure to comply with safety

requirements will lead to death or serious physical injury.

Symbol: WARNING

Meaning: Possibly 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 document).

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Prohibition of own 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.

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 U9B 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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U9B

B 20.U9B.40 en HBM

1 Scope of delivery

Force transducer U9B; mounting instruction

2 Field of application and notes on use

The transducers are intended for measuring static and dynamic tensile and

compressive forces. Their very small dimensions make them ideal for use

where little space is available (for example for measuring penetration forces in

manufacturing processes).

The force transducers are designed for harsh environmental conditions and

stringent service in requirements. They are maintenance-free and can even

be installed in places where access is difficult. Their electrical measuring sig-

nals can be transmitted to remote measuring stations and control rooms and

displayed or recorded there and used for control and regulating duties.

The transducers, as precision measuring instruments, require careful handling

during transport and installation. Loading impacts (for example ”free fall”

application of the load) even during measurement operations can lead to un-

expected overloads with permanent damage.

Special care must therefore be given to the base of the housing, which is rela-

tively thin.

The limits for permissible mechanical, thermal and electrical stressing are

given in the technical data. It is essential that these be respected.

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3 Structure and mode of operation

3.1 Measuring element

The force is transferred to the diaphragm measuring element in the U9B by a

threaded bolt. This type of measuring element has the advantage in that it

also acts as a housing, protecting the applied strain gauges. The transducer is

hermetically sealed by an adapter with threaded bolt which is welded on the

bottom.

3.2 Measuring procedure, output signal

The measuring spring and strain gauges are elastically deformed by a load

acting in the direction of measurement. The strain gauges modify their resis-

tance proportionally to their change in length. The Wheatstone bridge is thus

detuned. When a bridge excitation voltage is applied, the circuit supplies an

output signal proportional to the change in resistance and hence also propor-

tional to the force applied.

A measuring amplifier, suitable for strain gaugs measurements, is needed to

process the measurement signal.

4 Conditions at the site of installation

4.1 Ambient temperature

To achieve optimum measuring results, the nominal temperature range from

-10°C to +70°C must be maintained. Ideally, the temperatures should be

constant or subject to slow variations. The temperature effects indicated are

applicable –in compliance with VDI/VDE Recommendation 2637 –when the

temperatures do not change faster than 5 K/h.

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Temperature gradients in the transducer by cooling or heating on one side

(radiant heat) cause problems. A screen to protect against radiant heat and

thermal insulation on all sides produce marked improvements. Naturally, these

should not cause any force shunt.

NOTE:

The transducer output signal can be affected by the warmth of

the hand. If measurements are made at room temperature

(about 20°C), then you should wait about 15 min. after handling

the transducer before taking measurements.

4.2 Humidity

Ambient humidity and a tropical climate do not affect the function of the trans-

ducer, according to the classification of the protection indicated, correspond-

ing to protection class IP 67 to EN 60 529.

IP 67 means protected against the ingress of dust. It is also protected against

water, if the transducer is immersed in water under specified conditions with

regard to pressure and time (0.5 h in 1 m depth of water).

The housings of the transducers are manufactured entirely in stainless steel.

They can be used in harsh environments. The sheath of the connection cable

consists of polyurethane (PUR).

4.3 Deposits

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

point where they convey part of the measuring force to the housing, thus falsi-

fying the measured value (force shunt).

4.4 External pressure

The external atmospheric pressure can lie between 0 and 5 bars. Please note

that pressure fluctuations can displace the zero point.

Nennlast kN 0.5 1 2 5 10 50

Change in zero point for a change of

10mbar in ambient pressure (related to

the nominal load) % 0.01 0.006 0.01 0.004 0.002 0.001

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10 U9B

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5 Mechanical installation

5.1 Important precautions during installation

•Handle the transducers carefully.

•The force application surfaces on the transducer and on the mounting

accessories must be absolutely clean and seat properly.

•Do not overload the transducer, even briefly. Also short-term overloads

–e.g. due to unevenly distributed support loads –must be avoided.

•Each transducer should be shunted by a stranded copper cable (approx.

50mm2) during or immediately after installation. For this purpose, HBM

supplies very flexible earthing cable EEK

5.2 General guidelines for installation

Force must act on the force transducer precisely in the direction of measure-

ment as far as possible. Off-centre loading and side loading or lateral forces

are interference variables, and therefore causes for measuring errors, and

they can damage the transducer by exceeding the permissible limits. Side

loads and lateral forces also include the relevant components of any mea-

surement quantities which may be introduced at an oblique angle.

5.2.1 Mounting for tensile and compressive loads

The transducer can measure axial forces in the tensile and the compressive

directions. Even alternating loads are measured properly. To achieve this

though, the transducer must be mounted without any axial play.

Tensile and/or compressive forces are transferred via the two threaded bolts.

The force transfer parts are locked against the transducer using the hexagon

nuts included with the supplied items. To do this, the transducer is loaded with

the nominal force and the nuts tightened with the relevant tightening torque:

Nominal force (kN) Tightening torque (Nm)

0.5...1 8

2...20 40

50 200

As an installation aid, HBM recommends the knuckle eyes (see Chapter 9

”Dimensions”) which prevent transfer to the transducer of torsion and bending

moments as well as lateral forces. With dynamic loading pliable tie rods

should be used.

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