HBM U9B Operating Manual

B 20. U9B.40 en

Force transducer with
strain gauge measuring
system

U9B

Operating manual

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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 Conditions at the site of installation 8 . . . . . . . . . . . . . . . . . . . . . . . .

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

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

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

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

5 Mechanical installation 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 1 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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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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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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 sig­nals 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 un­expected overloads with permanent damage.

Special care must therefore be given to the base of the housing, which is rela­tively 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 resis­tance 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 propor­tional 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 trans­ducer, according to the classification of the protection indicated, correspond­ing 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 falsi­fying 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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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.
50mm

2

) 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 measure­ment 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 mea­surement 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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6 Electrical connection

6.1 Notes on wiring

Electrical and magnetic fields often cause the introduction of disturbing volt­ages into the measuring circuit. These disturbances are chiefly caused by
heavy current conductors installed parallel to the measuring lines, but they
can also be produced by contactors or electric motors in the vicinity. Also in­terference voltages can be occur along the electrical path, in particular
through earthing the measuring system at a number of points, causing differ­ences in potential.

To avoid noise injection,please note the following:

• Use only screened, low capacitance measuring (cable from HBM fulfills
these requirements).

• Do not lay the measuring cable parallel to power and control lines. If this is
not possible (e.g. in cable ducts), the measuring cable can be protected,
e.g. by steel conduit and a minimum distance of 50cm is maintained to the
other cables.

• The stray fields of transformers, motors and contactors must be avoided.

• Do not wire the transducer, amplifier and display device to multiple earths.

All equipment in the measuring system should be connected to the same
earth conductor.

• Further information can be taken from our reprint ”Electromagnetic Com-
patibility EMC”

6.2 Allocation of the cable cores

The 1.5 m long connection lead of the transducer has colour-coded free core
ends. The cable screen (YE) should be connected to the transducer ground. If
the transducer is connected according to the information given in the table,
the output voltage from the amplifier is positive for a compression load on the
transducer. If a negative output voltage is required at the measuring amplifier
during compressive loading, cores white and red of the transducer should be
changed over at the amplifier input.

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6.3 Connection technique

The transducers are fitted with a four-core connection cable and calibrated as
standard using the four-wire circuit

wh (white) Measuring signal (+)
bk (black) Bridge excitation voltage (–)

rd (red) Measuring signal (–)

bu (blue) Bridge excitation voltage (+)
ye (yellow) Cable screen

Fig. 6.1: Transducer with four-core cable

wh (white) Measuring signal (+)

bk (black) Bridge excitation voltage (–)
rd (red) Measuring signal (–)

bu (blue) Bridge excitation voltage (+)

ye (yellow) Cable screen

Sensor circuit

Sensor circuit

Fig. 6.2: Transducer with four-core cable, amplifier in six wire technique

ATTENTION:

There are balancing resistors under a coloured heat-shrink sleeve
at the end of the cable that must not be removed (re-use when
shortening the cable).

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6.4 Cable extensions

Extension cables must be of the screened low-capacitance type (HBM cables
fulfil this requirement). For cable extensions, care must be tacken to ensure a
satisfactory connection with the lowest transfer resistance and good insula­tion. The plug connectors from HBM fulfil these requirements.

If special humidity protection is required, e.g. the KVM Cable Joining Sleeves
(soldered and potted joints) or the VKK cable connection box (screwed con­nections in cast housing) can be used.

6.5 Parallel connection of more then one transducers

The parallel wiring of a number of transducers is normally possible. This might
lead to measurement errors through due to different output resistances. When
wiring transducers in parallel, cores of the same colour are connected to­gether.

The overall arrangement of transducers having the same nominal force – with
even load distribution – can be loaded with the sum of the individual forces.
The sensitivity of the complete circuit corresponds to the sensitivity of a single
transducer.

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7 Technical data

Type U9B
Nominal force kN 0.5 1 2 5 10 20 50
Accuracy class 0.5
Nominal sensitivity C

nom

mV/V 1

Relative sensitivity deviation d

c

% v"1 tens. / v"2 compress.

Effect of temperature per 10K on
sensitivity

in the nominal temperature range
in the service temperature range

TK

C

%
%

v "0.5
v "0.8

Effect of temperature per 10K on
zero signal

in the nominal temperature range
in the service temperature range

TK

0

%
%

v "0.5
v "0.8

Linearity % v "0.5
Hysteresis related to measuring

range limit

U %

v "0.5

Span in fixed mounting orientation % v "0.5
Creep at nominal load and refer-

ence temperature

over 30 min

d

crF+E

% v "0.2

Input resistance (BK-BU) at refer­ence temperature

R

e

Ω u 345

Output resistance (RD-WH) at refer­ence temperature

R

a

Ω

300–400

Insulation resistance R

Is

GΩ u 1

Service range of supply voltage B

U,G

V

0.5...12

Reference supply voltage U

ref

V 5

Reference temperature t

ref

°C [°F] +23 [+73.4]

Nominal temperature range B

t,nom

°C [°F] –10..70 [+14...+158]

Service temperature range B

t,G

°C [°F] –30...+85 [–22...+185]

Storage temperature range B

t,S

°C [°F] –30...+85 [–22...+185]

Protection class to EN 60 529 IP 67
Nominal measurement displace-

ment "15%

S

nom

mm t 0,1

Natural frequency "15% kHz 15.5 23.7 18.7 20 23 27.8 20
Service load (FG) % 120

Breaking load (FB) %

u200

Relative static side-load limit

1)

(FQ) %

40 20

Permissible vibration amplitude
to DIN 50 100

F

rb

% 70 40

Weight, approx. g 65 100 400
Cable length m 1.5

1

) referred to the load transfer point 2mm above diaphragm

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8 Dimensions (in mm)

B

EG

F

F

M

M

A

Y

R

C

Cable Ø 3
Cable length 1,5 m

a.f

R

Z

U9B; for nominal forces 2…50kN

a.f 9

Nominal force A

–0.1

B C E F G M R SW Y Z

0.5...1 kN 26 44.5 20.5 13 9.5 13.5 M5 20 8 ca.5.5 2.5

2...20 kN 26 60 28.5 21 16 21 M10 40 17 ca.5.5 5
50 kN 46 84 40 28 21.5 28 M16 x 1.5 80 24 ca.5.5 8

W

H

B

∅

A

D

G

∅J
∅K

F

L

M

AF

Knuckle eye ZGW, stainless (Accessories)

for Nominal

force

A B D F G H J K L M A.F W

0.5...1 kN 10 5

H7

18 27 36 6 9 11 4 M5 9 8

2...20 kN 20 10

H7

28 43 57 10.5 15 19 6.5 M10 17 14

50 kN 28 16

H7

42 64 85 15 22 27 8 M16x1.5 22 21

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HOTTINGER
BALDWIN
MESSTECHNIK

HOTTINGER BALDWIN MESSTECHNIK GMBH

Im Tiefen See 45 – D-64293 Darmstadt
Tel. ++49/6151/803-0, Fax. ++ 49/6151/894896

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9 Copy of Declaration of Conformity

Konformitätserklärung Declaration of Conformity Déclaration de Conformité

Document: 065/05.1996

Wir, We, Nous

Hottinger Baldwin Messtechnik GmbH, Darmstadt

erklären in alleiniger Verantwor­tung, daß das Produkt

declare under our sole responsibility
that the product

déclarons sous notre seule respon­sabilité que le produit

Kraftaufnehmer der Typenreihe U9B (C9B und Sondertypen)

auf das sich diese Erklärung be-
zieht, mit der/den folgenden
Norm(en) oder normativen Doku­ment(en) übereinstimmt (siehe
Seite 2) gemäß den Bestimmungen
der Richtlinie(n)

to which this declaration relates is in
conformity with the following stan­dard(s) or other normative docu­ment(s) (see page 2) following the
provisions of Directive(s)

auquel se réfère cette déclaration
est conforme à la (aux) norme(s) ou
autre(s) document(s) normatif(s)
(voir page 2) conformément aux dis­positions de(s) Directive(s)

89/336/EWG – Richtlinie des Rates vom 3. Mai 1989 zur Angleichung der Rechtsvorschriften der Mitglieds-

staaten über die elektromagnetische Verträglichkeit, geändert durch 91/263/EWG, 92/31/EWG
und 93/68/EWG

Erstmalige Anbringung der CE­Kennzeichnung: 1995

Die Absicherung aller produktspezi­fischen Qualitätsmerkmale erfolgt
auf Basis eines von der DQS
(Deutsche Gesellschaft zur Zertifi­zierung von Qualitätsmanagement­systemen) seit 1986 zertifizierten
Qualitätsmanagementsystems
nach DIN ISO 9001
(Reg.-Nr. DQS-10001).
Die Überprüfung der sicherheitsre­levanten Merkmale (Elektromagne­tische Verträglichkeit, Sicherheit
elektrischer Betriebsmittel) führt ein
von der DATech erstmal 1991 ak­kreditiertes Prüflaboratorium (Reg.­Nr. DAT-P-006 und
DAT-P-012) unabhängig im Hause
HBM durch.

Darmstadt, 10.05.96

First attachment of the CE mark: 1995

All product-related features are se­cured by a quality system in accor­dance with DIN ISO 9001, certified by
DQS (Deutsche Gesellschaft zur Zer­tifizierung von Qualitätsmanagement­systemen) since 1986 (Reg.-No.
DQS-10001). The safety-relevant fea­tures (electromagnetic compatibility,
safety of electrical apparatus) are veri­fied at HBM by an independent resting
laboratory which has been accredited
by DATech in 1991 for the first time
(Reg Nos. DAT-P-006 and
DAT-P-012).

Première application de la marque
CE: 1995

Chez HBM, la détermination de tous
les critères de qualité relatifs à un
produit spécifique est faire sur la
base d‘un protocole DQS (Deutsche
Gesellschaft zur Zertifizierung von
Qualitätsmanagementsystemem)
certifiant, depuis 1986, notre
système d‘assurance qualité selon
DIN ISO 9001
(Reg.-No. DQS-10001).
De même, tous les critères de
protection électrique et de compati­bilité électromagnetique sont certi­fiès par un laboratoire d‘essais indé-
pendant et accrèdiré depuis 1991
(Reg.-No. DAT-P-006 et
DAT-P-012.)

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Seite 2 zu Page 2 of Page 2 du

Document: 065/05.1996

Diese Erklärung bescheinigt die
Übereinstimmung mit den genann-

ten Richtlinien, beinhaltet jedoch
keine Zusicherung von Eigenschaf­ten.

Die Sicherheitshinweise der mitge­lieferte Produktdokumentation sind
zu beachten.

Folgende Normen werden zum
Nachweis der Übereinstimmung mit
den Vorschriften der Richtlinie(n)
eingehalten.

This declaration certifies conformity
which the Directives listed above, but
is no asservation of characteristics.

Safety directions of the delivered
product documentation have to be fol­lowed.

The following standards are fulfilled as
proof of conformity with the provisions
of the Directive(s)

Cette déclaration atteste al confor­mité avec les directives citées mais
n‘assure pas un certain charaktère.

S.v.p. observez les indications de
sécurité de la documentation du
produit ajoutée.

Pour la demonstration de la confor­mité aux disposition de(s) Direc­tive(s) le produit satisfait les
normes:

EN 50082-2: 1995 Elektromagnetische Verträglichkeit (EMV); Fachgrundnorm Störfestigkeit; Teil 2:

Industriebereich; Deutsche Fassung

SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:[phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR自动化 http://www.sensor-ic.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

18

U9B

B 20.U9B.40 en HBM

SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:[phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR自动化 http://www.sensor-ic.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

19

U9B

B 20.U9B.40 en HBM

SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:[phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR自动化 http://www.sensor-ic.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

Hottinger Baldwin Messtechnik GmbH

Postfach 10 01 51, D-64201 Darmstadt
Im Tiefen See 45, D-64293 Darmstadt
Tel.: [phone]; Fax: [phone]
E–mail: [e-mail] www.hbm.com

Modifications reserved.
All details describe our products in general form only.They are
not to be understood as express warranty and do not constitute
any liability whatsoever.

B 20. U9B.40 en

SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:[phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR自动化 http://www.sensor-ic.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]