HBM HBK U93 User manual

U93
ENGLISH DEUTSCH FRANÇAIS ITALIANO
Mounting Instructions
Montageanleitung
Notice de montage
Istruzioni per il montaggio

Hottinger Brüel & Kjaer GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbkworld.com
Mat.: 7-0111.0005
DVS: A02081 03 YI0 02
04.2022
EHottinger Brüel & Kjaer GmbH
Subject to modifications.
All product descriptions are for general information
only. They are not to be understood as a guarantee of
quality or durability.
Änderungen vorbehalten.
Alle Angaben beschreiben unsere Produkte in allge
meiner Form. Sie stellen keine Beschaffenheits- oder
Haltbarkeitsgarantie dar.
Sous réserve de modifications.
Les caractéristiques indiquées ne décrivent nos
produits que sous une forme générale. Elles
n'impliquent aucune garantie de qualité ou de
durabilité.
Con riserva di modifica.
Tutti i dati descrivono i nostri prodotti in forma
generica e non implicano alcuna garanzia di qualità o
di durata dei prodotti stessi.

U93
ENGLISH DEUTSCH FRANÇAIS ITALIANO
Mounting Instructions

U93
TABLE OF CONTENTS
2
TABLE OF CONTENTS
1 Safety Instructions 3................................................
2 Scope of supply 7...................................................
3 Application instructions 8...........................................
4 Structure and mode of operation 9....................................
4.1 Measuring body 9...................................................
4.2 Strain gage covering 9...............................................
5 Conditions on site 9.................................................
5.1 Ambient temperature 9..............................................
5.2 Moisture and humidity 9.............................................
5.3 Deposits 10.........................................................
6 Mechanical installation 11............................................
6.1 Important precautions during installation 11..............................
6.2 General installation guidelines 11.......................................
6.3 Mounting for tensile/compressive loading 12.............................
7 Electrical connection 14..............................................
7.1 Notes on cabling 14..................................................
7.2 Assignment of cable wires 14..........................................
7.2.1 Connecting to terminals 15............................................
7.2.2 Connecting to a plug 15...............................................
7.3 TEDS transducer identification 16......................................
8 Specifications (VDI/VDE 2638) 17......................................
9 Dimensions 19......................................................
10 Options 20..........................................................

3
U93
SAFETY INSTRUCTIONS
1 SAFETY INSTRUCTIONS
Designated use
The force transducers in the U93 type series are solely designed for measuring (static
and dynamic) tensile and dynamic compressive forces within the load limits specified by
the technical data for the respective maximum capacities. Any other use is not the desig
nated use.
To ensure safe operation, the regulations in the mounting instructions, together with the
following safety requirements, and the data specified in the technical data sheets, must
be complied with. It is also essential to observe the applicable legal and safety regula
tions for the application concerned.
The force transducers are not intended for use as safety components. Please also refer
to the section: “Additional safety precautions”. Proper and safe operation of the force
transducer requires proper transportation, correct storage, siting and mounting, and care
ful operation.
Loading capacity limits
The data in the technical data sheet must be complied with when using the force trans
ducer. In particular, the respective maximum loads specified must never be exceeded.
The following limits set out in the technical data sheets must not be exceeded
SLimit loads
SLateral load limits
SBreaking loads
SPermissible dynamic loads
STemperature limits
SLimits of electrical loading capacity
Please note that when several force transducers are interconnected, the load/force dis
tribution is not always uniform.
Use as a machine element
The force transducers can be used as machine elements. When used in this manner, it
must be noted that, to favor greater sensitivity, the force transducer cannot be designed
with the safety factors usual in mechanical engineering. Please refer here to the section
“Loading capacity limits”, and to the specifications.
Accident prevention
The prevailing accident prevention regulations must be taken into account, even though
the nominal (rated) force values in the destructive range are well in excess of the full
scale value.

U93
SAFETY INSTRUCTIONS
4
Additional safety precautions
The force transducers cannot (as passive transducers) implement any (safety‐relevant)
cutoffs. This requires additional components and constructive measures for which the
installer and operator of the plant is responsible.
In cases where a breakage or malfunction of the force transducer would cause injury to
persons or damage to equipment, the user must take appropriate additional safety mea
sures that meet at least the requirements of applicable safety and accident prevention
regulations (e.g. automatic emergency shutdown, overload protection, catch straps or
chains, or other fall protection).
The layout of the electronics conditioning the measurement signal should be such that
measurement signal failure does not cause damage.
General dangers of failing to follow the safety instructions
The force transducers are state‐of‐the‐art and reliable. Transducers can give rise to resid
ual dangers if they are incorrectly operated or inappropriately mounted, installed and op
erated by untrained personnel. Every person involved with siting, starting‐up, operating or
repairing a force transducer must have read and understood the mounting instructions
and in particular the technical safety instructions. The force transducers can be damaged
or destroyed by non‐designated use of the force transducer or by non‐
compliance with the mounting and operating instructions, these safety instructions or any
other applicable safety regulations (BG safety and accident prevention regulations) when
using the force transducers. Force transducers can break, particularly in the case of over
loading. The breakage of a force transducer can also cause damage to property or injury
to persons in the vicinity of the force transducer.
If force transducers are not used according to their designated use, or if the safety in
structions or specifications in the mounting and operating instructions are ignored, it is
also possible that the force transducer may fail or malfunction, with the result that per
sons or property may be affected (due to the loads acting on or being monitored by the
force transducer).
The scope of supply and performance of the transducer covers only a small area of force
measurement technology, as measurements with (resistive) strain gage sensors presup
pose the use of electronic signal processing. In addition, equipment planners, installers
and operators should plan, implement and respond to the safety engineering consider
ations of force measurement technology in such a way as to minimize residual dangers.
On‐site regulations must be complied with at all times.
Warns of a potentially dangerous situation in which failure to comply with safety require
ments could result in death or serious physical injury.
WARNING
Description of a potentially dangerous situation
Measures to avoid/prevent the danger

5
U93
SAFETY INSTRUCTIONS
The marking below draws your attention to a situation in which failure to comply with
safety requirements could lead to damage to property.
Notice
Description of a situation that could lead to damage to property
The marking below draws your attention to important information about the product or
about handling the product.
Important
Important information
The marking below contains application tips or other information that is useful to you.
Tip
Information/application instruction
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.
Maintenance
The U93 force transducer is maintenance free.
Disposal
In accordance with national and local environmental protection and material recovery and
recycling regulations, old transducers that can no longer be used must be disposed of
separately and not with normal household waste.
If you need more information about waste disposal, please contact your local authorities
or the dealer from whom you purchased the product.

U93
SAFETY INSTRUCTIONS
6
Qualified personnel
Qualified personnel means persons entrusted with siting, mounting, starting up and oper
ating the product, who possess the appropriate qualifications for their function.
This includes people who meet at least one of the three following requirements:
1. Knowledge of the safety concepts of automation technology is a requirement and as
project personnel, you must be familiar with these concepts
2. As automation plant operating personnel, you have been instructed how to handle the
machinery. You are familiar with the operation of the equipment and technologies
described in this documentation.
3. As commissioning engineers or service engineers, you have successfully completed
the training to qualify you to repair the automation systems. You are also authorized
to activate, ground and label circuits and equipment in accordance with safety engi
neering standards.
It is also essential to comply with the legal and safety requirements for the application
concerned during use. The same applies to the use of accessories.
The force transducer must only be installed by qualified personnel, strictly in accordance
with the specifications and with the safety requirements and regulations listed below.

7
U93
SCOPE OF SUPPLY
2 SCOPE OF SUPPLY
SU93 force transducer
SU93 operating manual
SManufacturing certificate

U93
APPLICATION INSTRUCTIONS
8
3 APPLICATION INSTRUCTIONS
The U93 type series transducers are suitable for measuring tensile and compressive
forces. Because they provide highly accurate static and dynamic force measurements,
they must be handled very carefully. Particular care must be taken when transporting and
installing the devices. Dropping or knocking the transducers may cause permanent dam
age.
It is essential to provide careful sealing so that the sensitive strain gage applications are
protected by the housing. Particular caution must be exercised with the base of the hous
ing, which is very thin.
The specifications on page 17 list the permissible limits for mechanical, thermal and elec
trical stress. It is essential that these are taken into account when planning the measuring
set‐up, during installation and, ultimately, during operation.

9
U93
STRUCTURE AND MODE OF OPERATION
4 STRUCTURE AND MODE OF OPERATION
4.1 Measuring body
The measuring element is a stainless steel, loaded member, to which strain gages (SG)
are applied. The SG are arranged so that two are stretched and the other two com
pressed when a force acts on the transducer.
4.2 Strain gage covering
To protect the SG, the U93 force transducers are welded at an appropriate place with a
thin metal plate. This procedure offers the SG a high protection against environmental
influences. In order to retain the protective effect, this plate must not be damaged in any
way; see section 6.2 on page 11.
5 CONDITIONS ON SITE
Protect the transducer from extreme moisture and dampness, weather conditions such
as rain, snow and ice, and salt water.
5.1 Ambient temperature
The temperature effects on the zero signal and on the sensitivity are compensated.
To obtain optimum measurement results, the nominal (rated) temperature range must be
observed. Constant, or very slowly changing temperatures are optimal. Temperature‐re
lated measurement errors are caused by heating on one side (e.g. radiant heat) or by
cooling. A radiation shield and all‐round thermal insulation produce noticeable improve
ments, but must not be allowed to set up a force shunt.
5.2 Moisture and humidity
Series U93 force transducers are hermetically weld‐sealed, giving them degree of protec
tion IP67 per DIN EN 60529 (test conditions: 100 hours under 1m water column). Never
theless, the force transducers must be protected against permanent moisture influence.
Notice
Moisture must not be allowed to penetrate the free end of the connection cable. Otherwise
the characteristic values of the transducer could vary, and cause measurement errors.

U93
CONDITIONS ON SITE
10
The transducer must be protected against chemicals that could attack the transducer
body steel or the cable. With stainless steel force transducers, please note that acids and
all materials which release ions will also attack stainless steels and their welded seams.
Should there be any corrosion, this could cause the force transducer to fail. In this case,
appropriate protective measures must be implemented.
5.3 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate sufficiently to di
vert some of the measuring force, thus invalidating the measured value (force shunt).
Notice
Measurement errors may be the result if dust or dirt is deposited inside the force trans
ducer. The relevant areas are marked by arrows in Fig. 5.1.
The gap below the flange
face must not become
clogged with foreign
matter.
Fig. 5.1 Avoid deposits in the marked areas

11
U93
MECHANICAL INSTALLATION
6 MECHANICAL INSTALLATION
6.1 Important precautions during installation
SHandle the transducer with care.
SWelding currents must not be allowed to flow over the transducer. If there is a risk
that this might happen, you must use a suitable low‐ohm connection to electrically
bypass the transducer. HBM, forexample, provides the highly flexible EEK ground
cable, which can be screwed on, both above and below the transducer.
SMake sure that the transducer cannot be overloaded.
WARNING
There is a danger of the transducer breaking if it is overloaded. This can cause danger for
the operating personnel of the system in which the transducer is installed.
Implement appropriate safety measures to avoid overloads or to protect against resulting
dangers.
6.2 General installation guidelines
The forces to be measured must act on the transducer as accurately as possible in the
direction of measurement. Torsional and bending moments, eccentric loading and lateral
forces may produce measurement errors and destroy the transducer, if limit values are
exceeded.
Notice
The transducer is hermetically sealed underneath by a welded base. This base is very thin,
and must not be subjected to mechanical stress (Fig. 6.1), as otherwise the housing could
be damaged. This would allow moisture to penetrate and destroy the transducer.

U93
MECHANICAL INSTALLATION
12
Load must not be applied here!
Fig. 6.1 Avoid the application of load to the marked surface
Important
The cable fastening side of the transducer should always be connected directly with the
rigid customer-side force transfer areas. Ensure that the cable is laid so that, where pos
sible, no force shunt is caused by the cable (e.g. through the weight or stiffness of the
cable).
6.3 Mounting for tensile/compressive loading
The transducer is bolted directly (via the ring‐shaped flange faces) onto a rigid, fully‐bear
ing structural element (such as a profile, a cover or a plate). With this method of installa
tion, transducers can measure axial forces in both the tensile and pressure directions.
Alternating loads can also be recorded perfectly.
SFor exact positioning, the transducer is fitted with centering aids on the upper and
lower mounting surfaces.
SThe upper and lower bearing pads must be flat and even. The roughness of the base
bearing pad must not exceed Ra= 0.8μm.
SThe component mounted on the U93 must be sufficiently hard and must not deform
when load is applied. We recommend a hardness of 43HRC.
SThoroughly clean the bearing pads before assembly.
SFor dynamic alternating loads, the tightening torque for the screws must be selected
so that the screws are pre‐stressed to above the operating load of the transducer. The
requisite data can be found in the table below.

13
U93
MECHANICAL INSTALLATION
45° or 22.5°
offset in the drawing
MA
MA
customer
side
customer
side
Base
Flange
ØC
Center the U93 over diameter C!
admissible
centering
depth 1 mm
admissible
centering
depth 1.5 mm
ØC
F
Fig. 6.2 Force transducer installation
Nominal
(rated) force
(kN)
Centering dia
meter CH8 Tightening torque MA
(NVm)
Screws for
transducer
mounting
min. floor side
thread reach
(mm)
1kN …10kN 18 9 4 x M5; 12.9 5
20kN …50kN 32 16 8 x M6; 12.9 8
Important
When screwing through the upper tapped hole, make sure that a gap remains between the
screw and the transducer body, even when the nominal (rated) force is applied. Otherwise
there would be a force shunt, that could lead to measurement errors.

U93
MECHANICAL INSTALLATION
14
7 ELECTRICAL CONNECTION
The transducers are delivered with a 3 m cable with free ends as standard, and the cable
terminations are color‐coded. The cable shield is connected in accordance with the
Greenline concept. This encloses the measurement system in a Faraday cage. Electro
magnetic interference cannot affect the measurement system.
Transducers with free ends must be fitted with CE‐norm connectors. The shielding must
be connected extensively.
With other connection techniques, an EMC‐proof shield should be applied in the wire area
and this shield should also be connected extensively (see also HBM Greenline Informa
tion, brochure i1577).
7.1 Notes on cabling
SUse shielded, low‐capacitance HBM cables only.
SDo not route the measurement cables parallel to power lines or control circuits. If this
is not possible (in cable pits, for example), protect the measurement cable with a rigid
steel conduit, for example and keep it at least 50 cms away from the other cables. The
power lines or control circuits should be twisted (15 twists per meter).
SAvoid stray fields from transformers, motors and contact switches.
SDo not ground the transducer, amplifier and indicator more than once, and attach all
the devices in the measuring chain to the same protective earth conductor.
SThe connection cable shielding is connected to the transducer housing.
SFollow the connection diagram and keep to the (Greenline) grounding concept.
STo achieve full accuracy, a six‐wire configuration should be used for an extension
cable.
7.2 Assignment of cable wires
If the transducer is connected in accordance with the wiring diagram below (Fig. 7.1),
when the transducer is loaded in the pressure direction, the output voltage at the ampli
fier is positive.

15
U93
MECHANICAL INSTALLATION
wh (white)
bk (black)
rd (red)
bu (blue)
gn (green)
gy (gray)
ye (yellow)
Measurement signal (+) UA
Excitation voltage (+) UB
Sense lead (-) and TEDS*
Sense lead (+)
Excitation voltage (-) UBand TEDS*
Measurement signal (-) UA
Cable shield, connected to the housing
* TEDS chip only if ordered
Fig. 7.1 U93 pin assignment (six-wire configuration)
Tip
Swap the white and red cable wires over, if you need a negative output voltage at the ampli
fier under compressive loading.
7.2.1 Connecting to terminals
1. Cut the cable sheath as shown in Fig. 7.2, to gain access to the shield.
2. Connect the shield extensively to the housing ground.
7.2.2 Connecting to a plug
Connect the cable shield extensively to the connector housing.
Cable sheath cut open around the
circumference and pushed
forward by about 2 mm
100
10
10
2
Fig. 7.2 Cable sheath with incision

U93
MECHANICAL INSTALLATION
16
7.3 TEDS transducer identification
Series U93 force transducers can be purchased with integrated TEDS chip. TEDS stands
for "Transducer Electronic Data Sheet".
An electronic data sheet can be stored in the transducer as defined in the IEEE1451.4
standard, making it possible for the amplifier to be set up automatically. A suitably
equipped amplifier imports the transducer characteristics (electronic data sheet), trans
lates them into its own settings and measurement can then start.
At the gray connection (to ground at black), there is a digital identification system avail
able. The basis for this is a DS2433 1‐wire EEPROM, made by Maxim/Dallas.
HBM provides you with the TEDS Editor program, for storing your data. This is a compo
nent part of the MGCplus Assistant software, for example, or the TEDS dongle module
from HBM, that allows you to program TEDS, even without an amplifier.

17
U93
SPECIFICATIONS
8 SPECIFICATIONS (VDI/VDE 2638)
Nominal (rated) force Fnom kN 1 2 5 10 20 50
Nominal (rated) sensitivity Cnom mV/V 0.5 1 0.5 1 0.5 1
Relative sensitivity error
(pressure)
dC% <"0.5
Relative zero signal error ds.o mV/V <"0.075
Hysteresis error
(0.5Fnom to Fnom)
ν0.5 % <"0.5
Relative non-linearity
(pressure)
dlin % <"0.5
Effect of temperature on
sensitivity per 10 K
relative to nominal (rated)
sensitivity
TKc% <"0.5
Temperature effect on the
zero signal/10 K
relative to nominal (rated)
sensitivity TK0%< 0.8 < 0.5 < 0.8 < 0.5 < 0.8 < 0.5
Effect of lateral forces 1)
(lateral force 10 % Fnom)
dQ%< 0.2 < 0.5 < 0.4
Effect of eccentricity per mm dE%< 0.07 < 0.03 < 0.12
Relative creep over 30 min dcrF+E % <"0.2
Input resistance RiΩ> 295
Output resistance RoΩ190 …400
Insulation resistance Ris Ω>1x 109
Reference excitation voltage Uref V 5
Operating range of excitation
voltage
BU.G V0.5 …12
Nominal (rated) temp. range Bt.nom °C -10 …+70
Operating temperature range Bt.G °C -30 …+85
Storage temperature range Bt.S °C -50 …+85
Reference temperature tref °C +23
Max. operating force FG% 180
Breaking force FB%> 400 > 300 > 300

U93
SPECIFICATIONS
18
502010521kNFnom Nominal (rated) force
Lateral limit force 1) FQ% 100 80 40
Permissible force application
eccentricity
eGmm 1.5 3 6
Nominal (rated) displacement
(±15%)
Snom mm 0.01 0.02 0.02 0.04 0.01 0.03
Natural frequency fGkHz 7.9 11.7 10.3
Weight with cable (approx.) g 200 600
Rel. permissible vibrational
stress
Frb % 150
Cable connection, six-wire configuration 3m cable length;
outside diameter 4mm;
6 x 0.08mm2; PU sheath;
min. bending radius R10
Degree of protection per DIN60529 IP67
Transducer identification (optional) TEDS, per IEEE 1451.4
1) relative to a force application point on the force application surface