HBM C6A Manual de usuario

A0638−2.3 de/en/fr

Kraftaufnehmer

Force transducer

Capteur de force

C6A

Montageanleitung

Mounting instructions

Notice de montage

English Page 3 −26.................................................

Deutsch Seite 27 −50...............................................

Français Page 51 −74...............................................

C6A

A0638−2.3 en/de/fr HBM

Contents Page

English

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

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

2 Area and method of use 7......................................

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

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

3.2 Housing 9................................................

3.3 Measuring process, output signal 9..........................

3.4 Disturbance variables 9....................................

4 Conditions on site 10...........................................

4.1 Ambient temperature 10.....................................

4.2 Moisture 10................................................

4.3 External pressure 10........................................

4.4 Chemical effects 10.........................................

4.5 Deposits 10................................................

5 Mechanical installation 11.......................................

5.1 Important measures for installation 11.........................

5.2 General installation guidelines 12.............................

5.3 Installation examples 12.....................................

5.3.1 Force conductor with pressure plates 13.................

5.3.2 Force conductor with load button ZL and pendle bearing

EPO3 14............................................

5.3.3 Force conductor with spherical cap ZK 16................

5.3.4 Tensile force introduction with spherical cap ZK 17........

5.4 Safety measures 17.........................................

6 Connections 18.................................................

6.1 Instructions for cabling 18....................................

6.2 Wiring pin assignment 19....................................

7 Specifications 20...............................................

8 Dimensions of the transducer and mounting accessories 22.......

8.1 Transducer (free dimension tolerance median to DIN 7168) 22....

8.2 Mounting accessories 23....................................

C6A

A0638−2.3 en/de/frHBM

Safety instructions

Use in accordance with the regulations

Force transducers in the C6A 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 C6A 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.

C6A

A0638−2.3 en/de/fr 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 is the manufacturer’s guarantee that his product meets the

requirements of the relevant EC directives (the declaration of conformity is

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

C6A

A0638−2.3 en/de/frHBM

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 C6A 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.

C6A

A0638−2.3 en/de/fr HBM

1 Scope of supply

•1 C6A force transducer

•1 C6A Operating Manual

Accessories (not included in the scope of supply):

•load button: 1−C6A/20T/ZL; 1−C6A/50T/ZL; 1−C6A/100T/ZL;

1−C6A/200T/ZL; 1−C6A/500T/ZL

•spherical cap: 1−C6A/50T/ZK; 1−C6A/100T/ZK; 1−C6A/200T/ZK;

1−C6A/500T/ZK

•pendle bearing - top: 1−EPO3R/20T; 1−EPO3/50T; 1−EPO3/100T;

1−EPO3/250T; 1−EPO3/500T

2 Area and method of use

The transducers are designed for the measurement of static and dynamic

pressure forces.

Tensile forces can also be measured with the transducers. The tension

elements required for this are attached to the top face of the transducer and

fed through the inner bore of the transducer so that tensile forces initiated via

the tension anchor act as pressure forces. The transducers can be installed in

any position for force measurement. The force conductor must however act in

the direction of the transducer axis.

HBM force transducers in this range measure dynamic forces in the load

direction just as precisely as static forces. In so doing the sum of the dynamic

loading and the static starting load must not exceed the nominal load.

The force transducers are maintenance − free and can be installed even in

poorly accessible places. Their electrical measurement signals can be

transmitted to remote measuring points and monitors in order to indicate and

As precision measuring instruments the force transducers must be handled

carefully during transport and mounting; impacts or dropping the transducer

could result in permanent damage. Loading impacts (e.g. applying a load in

”freefall”) in measuring mode can also result in unexpected overload with

lasting damage. Where such loading impacts cannot be ruled out they must

be checked.

The limits for the permissible mechanical stresses are stated in the

Specifications.

C6A

A0638−2.3 en/de/frHBM

3 Structure and mode of operation

3.1 Measuring element

The measuring element is a rotation−symmetrical body made of hardened

steel (Abb. 3.1).

If there is a loading in an axial direction the measuring element is upset. The

resulting strain is detected by a strain gauge which is connected to a

Wheatstone bridge.

Correction and compensation resistors are placed in the transducer circuit in

order to remove unwanted influences on the zero signal and sensitivity.

Nominal forces 0.2 − 2 MN Nominal force 5

1 = measuring element; 2= enclosure; 3= strain gauge; 4= force−introduction surface;

5= base plate; F= direction of force

Abb. 3.1: Schematic drawing

C6A

A0638−2.3 en/de/fr HBM

3.2 Housing

The housing protects the application from moisture and aggressive media. No

load or force may be initiated in the transducer via the housing.

The cable box is cast using a special casting compound and must not be

opened.

3.3 Measuring process, output signal

The force acting in the direction of measurement elastically deforms the

measuring spring and thus the S/G. The S/G changes its ohmic resistance in

proportion to the change in its length. The Wheatstone bridge is thereby

staggered. If an excitation voltage is applied the circuit provides an output

signal which is proportional to the change in resistance and thus also

proportional to the force applied.

The electrical connection of the transducer is executed in a six wire circuit

(see page 19).

3.4 Disturbance variables

Torsion, bending and transverse load are disturbance variables and are

therefore to be avoided. If necessary they can be remedied with HBM

mounting accessories (section 5.3).

The effects of temperature on the zero signal (S/G bridge and housing) and

on the sensitivity are compensated.

Changes in the ambient pressure act as additive (subtractive) forces. These

are scarcely of importance when compared with large nominal loads.

C6A

A0638−2.3 en/de/frHBM

4 Conditions on site

4.1 Ambient temperature

To achieve optimal measurement results the nominal temperature range must

be maintained. Constant but slowly changing temperatures are best.

Temperature gradients in the transducer caused by one−sided heating

(radiant heat) or cooling are very disruptive. A radiation shield and all−round

heat insulation bring about marked improvements. Naturally they must not

form a force shunt.

4.2 Moisture

External moisture and a tropical climate will not impair the function of the

transducer according to the classification of the specified degree of protection

(degree of protection IP 67 to DIN 40 050).

Transducers with nominal loads ≥1 MN are not metal−tight.

4.3 External pressure

The external pressure (in air) must be between 0 and 3 bar.

4.4 Chemical effects

The steel housing of the transducers is protected by a powder coating. If used

in difficult environmental conditions (direct weather effects, contact with media

which encourage corrosion) additional protective measures should be

employed by the user. The unit can be painted with commercial protective

paint or a tar−based coating (underseal). The sheath of the connection cable

is made of silicon rubber.

4.5 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).

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