HBM S2 User manual

A3181-1.0 de/en/fr
Force transducer
Kraftaufnehmer
Capteur de force
S2
Mounting Instructions
Montageanleitung
Notice de montage

English Page 3 - 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deutsch Seite 21 - 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Français Page 39 - 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3
S2
A3181-1.0 en/de/fr HBM
Contents Page
English
Safety information 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Scope of supply 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 General application instructions 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Structure and mode of operation 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Measuring element 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 SG cover 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Disturbance variables 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Conditions on site 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Ambient temperature 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Moisture and humidity 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Deposits 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Mechanical installation 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Important precautions during installation 12. . . . . . . . . . . . . . . . . . . .
5.2 General installation guidelines 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Installation with direct connection 13. . . . . . . . . . . . . . . . . . . . . . . . . .
5.4 Installation with knuckle eyes 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Electrical connection 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Connection with six‐wire configuration 15. . . . . . . . . . . . . . . . . . . . . .
6.2 Connection with four‐wire configuration 15. . . . . . . . . . . . . . . . . . . . .
6.3 Shortening the cable 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4 Cable extension 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.5 EMC protection 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Specifications (VDI/VDE 2638 standards) 17. . . . . . . . . . . . . . . . . . . . . .
8 Dimensions 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

S2
4
A3181-1.0-3.0 en/de/frHBM
Safety information
Designated use
The force transducers in the type series S2 are solely designed for measuring
static and dynamic tensile and/or compressive forces within the load limits
specified by the technical data for the respective maximum capacities. Any
other use is not the designated use.
To ensure safe operation, the regulations in the assembly and operating in
structions, together with the following safety rules and regulations, and the
data specified in the technical data sheets, must be complied with. It is also
essential to observe the applicable legal and safety regulations for the ap
plication concerned.
The force transducers are not intended for use as safety components. Please
also refer to the section: “Additional safety precautions”. Proper and safe op
eration of the force transducer requires proper transportation, correct storage,
siting and mounting, and careful operation.
Loading capacity limits
The data in the technical data sheet must be complied with when using the
force transducer. 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
•Limit loads
•Lateral load limits
•Breaking loads
•Permissible dynamic loads
•Temperature limits
•Limits of electrical loading capacity
Please note that when several force transducers are interconnected, the load/
force distribution 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 the technical
data.

5
S2
A3181-1.0 en/de/fr HBM
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.
Additional safety precautions
The force transducers cannot (as passive transducers) implement any (safety‐
relevant) cutoffs. This requires additional components and constructive mea
sures 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 appropri
ate additional safety measures that meet at least the requirements of applica
ble 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 remaining dangers if they are incorrectly operated or inappropriately
mounted, installed and operated by untrained personnel. Every person in
volved 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 de
stroyed 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 regula
tions) when using the force transducers. Force transducers can break, partic
ularly in the case of overloading. The breakage of a force transducer can also
cause damage to property or injury to persons in the vicinity of the force trans
ducer.
If force transducers are not used according to their designated use, or if the
safety instructions or specifications in the mounting‐ and operating instruc
tions are ignored, it is also possible that the force transducer may fail or mal
function, with the result that persons 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 presuppose the use of electronic signal processing. In
addition, equipment planners, installers and operators should plan, implement
and respond to the safety engineering considerations of force measurement

S2
6
A3181-1.0-3.0 en/de/frHBM
technology in such a way as to minimize remaining dangers. Prevailing regu
lations must be complied with at all times.
Warns of a potentially dangerous situation in which failure to comply with
safety requirements can result in death or serious physical injury.
WARNING
Description of a potentially dangerous situation
Measures to avoid/prevent the danger
Warns of a potentially dangerous situation in which failure to comply with
safety requirements can result in slight or moderate physical injury.
CAUTION
Description of a potentially dangerous situation
Measures to avoid/prevent the danger
Warns of a situation in which failure to comply with safety requirements could
lead to damage to property.
NOTE
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.

7
S2
A3181-1.0 en/de/fr HBM
Tip
Information/Application instructions
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 ex
clude all liability on our part for any damage resulting therefrom.
Maintenance
The S2 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 garbage.
If you need more information about waste disposal, please contact your local
authorities or the dealer from whom you purchased the product.
Qualified personnel
Qualified personnel means persons entrusted with siting, mounting, starting
up and operating the product, who possess the appropriate qualifications for
their function.
This includes people who meet at least one of the three following require
ments:
- Knowledge of the safety concepts of automation technology is a require
ment and as project personnel, you must be familiar with these concepts
- 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
- 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 engineering standards.
It is also essential to comply with the legal and safety requirements for the ap
plication 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 regu
lations listed below.

S2
8
A3181-1.0-3.0 en/de/frHBM
1 Scope of supply
•1 S2 force transducer
•1 Mounting instructions
•1 Manufacturing certificate
Accessories (not included among the items supplied):
•Knuckle eye ZGW Order No. 1‐U1R/200KG/ZGW
2 General application instructions
The S2 type series force 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 damage.
The potting material (sealing for protection of sensitive strain gage installa
tions) must not be damaged otherwise the transducer will become unusable.
The specifications 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
S2
A3181-1.0 en/de/fr HBM
3 Structure and mode of operation
3.1 Measuring element
The measuring element is an aluminum loaded member on which strain
gages (SG) are installed. The SG are arranged so that two are stretched and
the other two compressed when a force acts on the transducer.
3.2 SG cover
To protect the SG, the S2 force transducers are potted with a plastic material
at an appropriate place. This is used to protect against mechanical damage.
Potting material
Potting material
Fig 3.1: SG installation protection
3.3 Disturbance variables
Torsion, bending and lateral loads are disturbance variables and therefore to
be avoided.

S2
10
A3181-1.0-3.0 en/de/frHBM
4 Conditions on site
Protect the transducer from weather conditions such as rain, snow, ice and
salt water.
4.1 Ambient temperature
The temperature effects on the zero signal and on the sensitivity are compen
sated.
To obtain optimum measurement results, the nominal (rated) temperature
range must be observed. Constant, or very slowly changing, temperatures are
optimal. Temperature‐related measurement errors are caused by heating on
one side (e.g. radiant heat) or by cooling. A radiation shield and all‐round ther
mal insulation produces noticeable improvements, but must not be allowed to
set up a force shunt.
4.2 Moisture and humidity
Series S2 force transducers are protected against moisture. The transducers
reach the protection class IP68 per DIN EN 60259. Nevertheless, the force
transducer must be protected against permanent moisture influence.
The transducer must be protected against chemicals that could attack the alu
minum, potting material or the cable.
The transducer can also malfunction due to corrosion. Implement protective
measures if this danger exists.
NOTE
Moisture must not be allowed to penetrate the free end of the connection
cable. Otherwise the characteristic values of the transducer could change and
therefore cause measurement errors.
4.3 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate suffi
ciently to divert some of the force to be measured, thus invalidating the mea
sured value (force shunt).

11
S2
A3181-1.0 en/de/fr HBM
NOTE
Measurement errors may be the result if dust or dirt is deposited inside the
load cells. The relevant areas are marked by arrows in Fig 4.1.
The overload stop must remain free
Fig 4.1: Deposits at the marked areas must be avoided

S2
12
A3181-1.0-3.0 en/de/frHBM
5 Mechanical installation
5.1 Important precautions during installation
•Treat the transducer carefully.
•Do not permit welding currents to flow over the transducer. If this danger
exists, you must bridge the transducer electrically with a suitable
low‐resistance connection. HBM offers e.g. the highly flexible EEK ground
cable for this purpose, which can be screwed to the top and bottom of the
transducer.
•Ensure 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.
5.2 General installation guidelines
The forces to be measured must act on the transducer as accurately as pos
sible in the direction of measurement. Torsional and bending moments, ec
centric loading and lateral forces may produce measurement errors and de
stroy the transducer, if limit values are exceeded. Interference effects must be
absorbed by suitable construction elements, whereby these elements must
not absorb any loads in the measuring direction of the transducer.
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 possible, no force shunt is caused by the cable (e.g.
through the weight or stiffness of the cable).

13
S2
A3181-1.0 en/de/fr HBM
5.3 Installation with direct connection
In this mounting variant, the transducer is mounted with tension/compression
bars on a construction element and can then be measured in the tensile and
compressive directions. Alternating loads are also correctly recorded if the
transducer is mounted without axial play. For dynamic alternating loads, the
upper and lower threaded connectors must be pre‐stressed to above the max
imum working force and then locked in place.
Installation and locking with initial stress (recommended mounting vari
ant)
1. Screw in the threaded connector.
2. Load the transducer with 110% of the force that will occur during subse
quent operation in the tensile direction.
3. Tighten the locknut by hand.
4. Relieve the transducer.
Installation and locking with torque
1. Screw in the threaded connector.
2. Tighten the locknut with a torque of 15 Nm.
NOTE
When locking, the tightening torque must not be shunted through the trans
ducer.
5.4 Installation with knuckle eyes
Knuckle eyes prevent the application of torsional moments and, where 2
knuckle eyes are used, bending moments, together with lateral and oblique
loads in the transducer. They are suitable for use with quasi‐static loads (load
cycles v10 Hz). Pliable tension/compression bars should be used for dy
namic loads with higher frequencies.
NOTE
Do not undo any threaded connectors marked with “A” as this could otherwise
irreversibly damage the transducer.

S2
14
A3181-1.0-3.0 en/de/frHBM
Customer side:
approx. 87
F
Rigid force transfer
107
A
A
A
F
MB
MB
A
A
A
MB
Fig 5.1: Installation with knuckle eyes
Installation and locking with initial stress (recommended mounting vari
ant)
1. Rotate the locknut back to the eye.
2. Screw the knuckle eye completely into the transducer.
3. Unscrew the knuckle eye 1 to 2 threads and align.
4. Load the transducer with 110% of the force that will occur during subse
quent operation in the tensile direction.
5. Tighten the locknut by hand.
6. Relieve the transducer.
Installation and locking with torque
1. Rotate the locknut back to the eye.
2. Screw the knuckle eye completely into the transducer.
3. Align the knuckle eye.
4. Tighten the locknut with a torque of 15 Nm.
NOTE
When locking, the tightening torque must not be shunted through the trans
ducer.

15
S2
A3181-1.0 en/de/fr HBM
6 Electrical connection
The following can be connected for measurement signal conditioning:
•Carrier‐frequency amplifier
•DC amplifier
designed for strain gage measurement systems.
The S2 force transducer is delivered with a six‐wire configuration.
6.1 Connection with six‐wire configuration
The transducer is delivered with a 3 m cable with free ends as standard.
(white)
(black)
(orange)
Excitation voltage ())
(green)
(red)
(Shield)
Excitation voltage (*)
Sense lead (*)
Measurement signal ())
(blue) Sense lead ())
Measurement signal (*)
Cable shield, connected to the housing
Fig 6.1: Pin assignment in six‐wire configuration
With this cable assignment, the output voltage at the measuring amplifier is
positive in the tensile direction when the transducer is loaded.
The connection cable shielding is connected to the transducer housing. Trans
ducers with free cable ends must be fitted with connectors complying with the
EMC guidelines. The shielding must be connected extensively. With other
connection techniques, an EMC‐proof screen should be applied in the wire
area and this screen should also be connected extensively (see also HBM
Greenline Information, brochure i1577).
6.2 Connection with four‐wire configuration
When transducers with a six‐wire configuration are connected to amplifiers
with a four‐wire configuration, the sense leads of the transducer must be con
nected to the corresponding supply leads: Identification (+) with (+) and identi
fication (-) with (-), see Fig 6.1. This measure also reduces the cable resist
ance of the excitation voltage leads. However, there will be a voltage loss on
the supply leads due to the cable resistance that is still present and not com
pensated for by the six‐wire configuration. A large part of this loss can be

S2
16
A3181-1.0-3.0 en/de/frHBM
eliminated by a calibration, however, the temperature‐dependent part remains.
The TKcvalue given in the specifications for the transducer therefore does not
apply for the cable and transducer combination when connection is with four‐
wire configuration, the cable percentage must be added.
6.3 Shortening the cable
As the transducer connection uses a six‐wire configuration, you can shorten
the 6‐wire transducer cable without affecting the measurement accuracy.
6.4 Cable extension
The cable of a six‐wire force transducer can be extended with a cable of the
same type.
Only use shielded, low‐capacitance measurement cables for extension. En
sure that connection is perfect, with a low contact resistance.
6.5 EMC protection
Electrical and magnetic fields often induce interference voltages in the mea
suring circuit. Therefore:
•Use shielded, low‐capacitance measurement cables only (HBM cables
fulfill both conditions)
•Do not route the measurement cables parallel to power lines and control
circuits. If this is not possible, protect the measurement cable with e.g. steel
conduit.
•Avoid stray fields from transformers, motors and contact switches.
•Do not ground the transducer, amplifier and indicator more than once.
•Connect all devices in the measurement chain to the same grounded
conductor.

17
S2
A3181-1.0 en/de/fr HBM
7 Specifications (VDI/VDE 2638 standards)
Type p 2
Nominal (rated) force Fnom N 20 50 100 200 500 1000
Accuracy class 0.05
Nominal (rated) sensitivity Cnom mV/V 2
Relative sensitivity error (pres
sure) dc%<"0.25
Rel. tensile/compression sen
sitivity variation dzd %<"0.1
Relative zero signal error ds.o % <8 <6 <5
Relative reversibility error
(0.2 Fnom to Fnom)u % <0.1
Linearity error dlin % <0.05
Effect of temperature on sen
sitivity per 10 K
(related to sensitivity) TKc%<0.05
Temperature effect on the zero
signal/10 K
(related to sensitivity) TK0%<0.05
Effect of eccentricity per 1mm dE%<"0.1
Effect of lateral forces1)
Lateral force 10 % Fnom
dQ%<"0.1
Relative creep over 30 min. dcrF+E %<"0.05
Input resistance RiΩ>345
Output resistance RoΩ300 - 500
Insulation resistance Ris Ω>2x109
Reference excitation voltage Uref V 5
Operating range of excitation
voltage BU.GT V 0.5 …12
Nominal (rated) temperature
range Bt.nom oC +10 …+70
Operating temperature range Bt.G oC -10 …+70
Storage temperature range Bt.S oC -30 …+85
Reference temperature tref oC +23
Max. operating force (FG) % 120 150
Limit force (FL) % <900 <600 <300
Breaking force (FB) % >1000 >700 >400
Limit torque (Md) N⋅m 0.6 1.5 3 6 15 15
Static lateral limit force1) (FQ) % 50 100 50
Nominal (rated) displacement Snom mm <0.4
Fundamental resonance fre
quency fGkHz 0.29 0.49 0.76 1.09 1.81 2.45

S2
18
A3181-1.0-3.0 en/de/frHBM
Nominal (rated) force 10005002001005020NFnom
Relative permissible oscilla
tory stress Frb %"70
Weight kg approx. 0.4
Degree of protection per DIN 60529 IP65
Materials:
Measuring body
Potting material (SG cover)
Screwed cable gland
Cable sheath
Aluminum
Silicone rubber
Stainless steel / Perbunan seal
PVC
Cable length, six‐wire configuration m 3
1) relative to a point of contact on the force application surface

19
S2
A3181-1.0 en/de/fr HBM
8 Dimensions
25,4
M8
60
40
80
Cable 3 m
Knuckle eye 1‐U1/200KG/ZGW
44
24 12
9
8H7
M8
15
32
Weight:50 g

S2
20
A3181-1.0-3.0 en/de/frHBM