HBM KMR Manuel utilisateur

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Force washer

KMR

Mounting instructions

A2114-1.1_en/de

KMR

2 A2114-1.1_en/de

English

1 Safety instructions 3........................................

2 Scope of supply 6..........................................

3 Field of application and notes on use 6......................

4 Structure and function 6....................................

4.1 Measuring element 6.........................................

4.2 Measurement, output signal 7.................................

4.3 Disturbance variables 7.......................................

5 Conditions on site 7........................................

5.1 Ambient temperature 7.......................................

5.2 Protection against humidity 8..................................

5.3 External pressure 8..........................................

6 Mechanical installation 9....................................

6.1 Important precautions during mounting 9........................

6.2 General guide lines for installation 9............................

6.3 Examples for mounting 10.....................................

7 Connection 14...............................................

7.1 Allocation of the cable cores 14.................................

7.2 Connection technique 15.......................................

8 Specifications 16............................................

9 Dimensions 18..............................................

KMR

A2114-1.1_en/de 3

1 Safety instructions

Use in accordance with the regulations

The KMR are intended for the measurement of forces in

test rigs / press‐fit facilities / test systems / presses. Any

other use is deemed to be not in accordance with the

regulations.

In the interests of safety the transducer should be used

only as specified in the mounting instructions. It is also

essential to comply with the statutory and safety

regulations in force for the particular application. The

same applies to the use of accessories.

The transducer is not a safety device as defined for use

in accordance with the regulations. Perfectly safe

operation of this transducer demands appropriate

transport, as well as technically correct storage,

installation and mounting combined with careful operation

and maintenance.

General dangers due to non-observance of the

safety instructions

KMR comply with the state of the art and are fail‐safe.

The transducers can give rise to residual dangers if they

are inappropriately installed and operated by untrained

personnel.

Any person responsible for 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.

KMR

4 A2114-1.1_en/de

Residual dangers

The scope of performance and supply covers only part of

measurement technology. In addition, equipment

planners, installers and operators should plan, implement

and be responsible for the technical safety aspects of

force measurement technology in such a way as to

minimise the residual dangers. Prevailing regulations

must be complied with at all times. The residual dangers

connected with the force measurement technology must

be referred to explicitly.

Warning signs and danger symbols

Important instructions for your safety are specifically

identified. It is essential to follow these instructions in or

der to prevent accidents and damage to property.

Residual dangers are highlighted in these mounting

instructions with the following symbols:

Warning sign, signal word Meaning

CAUTION This marking warns of a potentially dangerous situ

ation in which failure to comply with safety require

ments can result in slight or moderate physical injury.

CE mark

The CE mark enables the manufacturer to guarantee that

the product complies with the requirements of the

relevant EC directives (the declaration of conformity is

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

Statutory marking requirements for waste disposal

National and local regulations regarding the protection of

the environment and recycling of raw materials require

old equipment to be separated from regular domestic

waste for disposal.

KMR

A2114-1.1_en/de 5

For more detailed information on disposal, please contact

the local authorities or the dealer from whom you

purchased the product.

Conversions and modifications

The KMR must not be modified from the design or

safety‐engineering point of view without our express

agreement. Any modification precludes liability on our

part for any damage resulting therefrom.

Qualified personnel

This instrument is to be used by qualified personnel only,

in strict accordance with the safety rules and regulations.

It is also essential to comply with the statutory and safety

regulations in force for the particular application. The

same applies to the use of accessories.

"Qualified personnel" means persons familiar with the

installation, assembly, commissioning and operation of

the product who possess the qualifications required for

their function.

Conditions on site

Protect the transducers from moisture and atmospheric

influences such as rain, snow, etc.

Maintenance

The KMR is maintenance‐free.

Accident prevention

Even though the specified nominal force in the

destructive range is a multiple of the full scale value, the

relevant accident prevention regulations of the trade

safety association must be observed.

KMR

6 A2114-1.1_en/de

2 Scope of supply

SKMR

S2 hardened washers as force introduction parts

SMounting instructions

3 Field of application and notes on use

The KMR are designed to measure static and dynamic

compressive forces, and are especially suitable for the

monitoring of forces, e.g. with production processes or

bolted connections. Furthermore, they are used in the

food industry, for example.

The IP67 degree of protection also permits outdoor

measurements to be taken.

4 Structure and function

4.1 Measuring element

The KMR have been designed as welded construction

and are completely made from corrosion‐resistant,

hardened steel. They can be mounted in any position.

In the measuring element, strain gauges are connected

to form a Wheatstone bridge. The balancing elements

are located in the cable end.

Therefore, do in no case shorten the cable.

KMR

A2114-1.1_en/de 7

The connection‐cable sheathing is made from

polyurethan (PUR).

4.2 Measurement, output signal

With axial forces, the measuring element is upset and the

Wheatstone bridge detuned. With a bridge excitation

voltage fed, the circuit supplies an output signal that is

proportional to the change in resistance and thus

proportional to the force applied.

Measurement signal conditioning requires an electronic

system (e.g. an amplifier) that is part of the complete

measuring chain.

4.3 Disturbance variables

Torsion, bending and side forces are disturbances that

may reduce accuracy or even damage the KMR.

5 Conditions on site

5.1 Ambient temperature

To obtain optimum measuring results, the nominal

temperature range of -10...+70 oC (+14...+158 °F) has to

be observed. Constant or, at the most, slowly changing

temperatures are most suitable. The specified

temperature coefficients apply to an ambient temperature

changing no faster than 5 K/h.

KMR

8 A2114-1.1_en/de

5.2 Protection against humidity

Ambient humidity and tropical climates do not impair the

function of the KMR. The KMR complies with IP67

degree of protection according to DIN EN 60529.

IP67 means: Protection against the penetration of dust,

and protection against water, if the KMR is dived into

water (test condition: 0.5 h in 1 m water depth). To

prevent penetration of condensation water, bend the

cable to form a drip loop.

right wrong

Fig. 5.1 Drip loop

5.3 External pressure

The permissible external pressure is 0...3 bar.

KMR

A2114-1.1_en/de 9

6 Mechanical installation

6.1 Important precautions during

mounting

SHandle the KMR with care.

SThe KMR must lean plainly on the clean supporting

surface and may not bend.

SAlways use the supplied washers for force

introduction (do in no case bring spring washers, tooth

lock washers etc. into direct contact with the KMR).

6.2 General guide lines for installation

To determine the absolute value of the force to be

monitored, you have to calibrate the KMR with a test

transducer while it is in its final mounting position.

Depending on the mounting position, there are significant

changes in output signal. The following factors are

effective:

SFriction

SStiffness of the components

SSurface unevenness

SAsymmetric force introduction

After calibration, the mounting position may not be

changed.

KMR

10 A2114-1.1_en/de

6.3 Examples for mounting

The following examples for installation show the various

possibilities to use the KMR.

SMonitoring flange joints

With this measurement set‐up, critical flange joints or the

setting of screws (max. property class 14.9) can be

monitored.

CAUTION

Please ensure when tightening the screws that the

connecting cable is not sheared off. Slightly lubricate the

supporting surface of screw head or nut to prevent the

transducer from turning during fastening of the screw.

You thus avoid shearing off the cable connection.

KMR

Washer

Fig. 6.1 Monitoring a screw preload

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