HBM HBK S2M User manual

S2M
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.: 7-2001.3592
DVS: A03592 01 YI0 05
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.

S2M
ENGLISH DEUTSCH FRANÇAIS ITALIANO
Mounting Instructions

S2M
TABLE OF CONTENTS
2
TABLE OF CONTENTS
1 Safety instructions 3................................................
2 Markings used 6....................................................
2.1 The marking used in this document 6..................................
3 Scope of supply and equipment variants 7.............................
4 General application instructions 8....................................
5 Structure and mode of operation 9....................................
5.1 Measuring body 9...................................................
5.2 Strain gauge covering agent 9........................................
5.3 Disturbance variables 9..............................................
6 Conditions on site 10.................................................
6.1 Ambient temperature 10..............................................
6.2 Moisture and humidity 10.............................................
6.3 Deposits 10.........................................................
7 Mechanical installation 12............................................
7.1 Important precautions during installation 12..............................
7.2 General installation guidelines 12.......................................
7.3 Mounting the S2M 14.................................................
7.3.1 Mounting with tension/compression bars 14.............................
7.3.2 Mounting with direct connection 14.....................................
7.3.3 Mounting with knuckle eyes 14.........................................
7.3.4 Installation with load button and thrust piece 18..........................
8 Electrical connection 22..............................................
8.1 Connection in a six‐wire configuration 22................................
8.2 Connection in a four‐wire configuration 22...............................
8.3 Shortening the cable 23...............................................
8.4 Extension cable 23...................................................
8.5 EMC protection 23...................................................
9 TEDS transducer identification 24......................................
10 Specifications (VDI/VDE/DKD 2638) 25.................................
11 Dimensions 28......................................................

3
S2M
SAFETY INSTRUCTIONS
1 SAFETY INSTRUCTIONS
Designated use
The force transducers in the type series S2M 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 desig
nated use.
To ensure safe operation, the regulations in the mounting instructions, 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 reg
ulations 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 force trans
ducers 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 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 was not 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.

S2M
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 pre
cautions 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. There may be risks involved if the
transducers are mounted, sited, installed and operated inappropriately, or 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 regula
tions (BG safety and accident prevention regulations) when using the force transducers.
Force transducers can break, particularly 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 transducer.
If force transducers are not used according to their designated use, or if the safety
instructions 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 gauge sensors pre
suppose the use of electronic signal conditioning. In addition, equipment planners,
installers and operators should plan, implement and respond to the safety engineering
considerations of force measurement technology in such a way as to minimize residual
dangers. On‐site regulations must be complied with at all times.
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.

5
S2M
SAFETY INSTRUCTIONS
Maintenance
The S2M 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 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 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:
SKnowledge of the safety concepts of automation technology is a requirement and as
project personnel, you must be familiar with these concepts.
SAs 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.
SAs system startup 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 engin
eering 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 safety requirements and regulations.

S2M
MARKINGS USED
6
2 MARKINGS USED
2.1 The marking used in this document
Important instructions for your safety are specifically identified. It is essential to follow
these instructions in order to prevent accidents and damage to property.
Symbol Significance
DANGER Warns of an imminently dangerous situation in which
failure to comply with safety requirements will result
in death or serious physical injury.
WARNING This marking warns of a potentially dangerous situ
ation in which failure to comply with safety require
ments can result in death or serious physical injury.
CAUTION This marking warns of a potentially dangerous
situation in which failure to comply with safety
requirements can result in slight or moderate physical
injury.
Notice This marking draws your attention to a situation in
which failure to comply with safety requirements can
lead to damage to property.
Important This marking draws your attention to important in
formation about the product or about handling the
product.
Tip This marking indicates application tips or other
information that is useful to you.
Information This marking draws your attention to information
about the product or about handling the product.
Emphasis
See …
Italics are used to emphasize and highlight text and
identify references to sections, diagrams, or external
documents and files.

7
S2M
SCOPE OF SUPPLY AND EQUIPMENT VARIANTS
3 SCOPE OF SUPPLY AND EQUIPMENT VARIANTS
SS2M force transducer
SMounting instructions
SManufacturing certificate
Accessories (not included in the scope of supply):
SKnuckle eye for S2M (all capacities): ordering number 1-U1R/200KG/ZGW
Equipment variants
All force transducers are available in the following versions:
1. Cables
The standard version of the S2M is equipped with a 6 m long cable. You can also or
der the force transducer with the following cable lengths:
-1.5 m (option 01M5)
-3 m (option 03M0)
2. Plugs
We can fit one of the following plugs to the S2M on request:
-D-SUB connector, 15-pin: a 15-pin plug for connection to numerous amplifier sys
tems, e.g. MGCplus, Scout, MP85, etc. (option F)
-D-SUB HD connector: a 15-pin plug for connection to appropriate amplifier systems,
e.g. the HBM QuantumX system (option Q)
-3106 PEMV connector (Greenline): for connection to appropriate amplifier systems,
e.g. MGCplus with AP03. (option N)
-ConP1016 connector, 14-pin, for connection to the Somat XR measurement system.
-Free ends: transducer delivered without plugs
3. TEDS
You can order the force transducer with transducer identification ("TEDS"). TEDS
(Transducer Electronic Data Sheet) allows you to store the transducer data (character
istic values) in a chip that can be read out by a connected measuring device (with an
appropriate amplifier). HBM records the TEDS data before delivery so that no para
meterization of the amplifier is necessary. TEDS can only be fitted in the plug of the
S2M, therefore it is not possible to equip the "free cable ends" version with TEDS

S2M
GENERAL APPLICATION INSTRUCTIONS
8
4 GENERAL APPLICATION INSTRUCTIONS
The S2M type series force transducers are suitable for measuring tensile and compress
ive forces. Because they provide highly accurate static and dynamic force measure
ments, they must be handled very carefully. Particular care must be taken when trans
porting and installing the devices. Dropping or knocking the transducer may cause
permanent damage.
The potting material (sealing for protection of sensitive strain gauge installations) must
not be damaged, otherwise the transducer will become unusable.
The specifications list the permissible limits for mechanical, thermal and electrical
stress. It is essential that these are taken into account when planning the measuring
set‐up, during installation and, ultimately, during operation.

9
S2M
STRUCTURE AND MODE OF OPERATION
5 STRUCTURE AND MODE OF OPERATION
5.1 Measuring body
The measuring body is an aluminum bending beam on which strain gauges (SG) are
installed. The SG are arranged so that two are stretched and the other two compressed
when a force acts on the transducer.
5.2 Strain gauge covering agent
To protect the SG, the S2M force transducers are potted with a plastic material at an
appropriate place. This procedure offers the SG high protection against environmental
influences. To retain the protective capacity and ensure permanent functionality, the
force transducer potting material must not become damaged.
Potting material
Fig. 5.1 SG installation protection
5.3 Disturbance variables
Torsion, bending and lateral loads are disturbance variables and therefore to be avoided.

S2M
CONDITIONS ON SITE
10
6 CONDITIONS ON SITE
Protect the transducer from weather conditions such as rain, snow, ice and salt water.
6.1 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. Temperat
ure‐related 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
improvements, but must not be allowed to set up a force shunt.
6.2 Moisture and humidity
Series S2M force transducers are protected against moisture. The transducers attain
protection class IP67 per DIN EN60259. Despite this, force transducers must be protec
ted against permanent exposure to moisture.
The transducer must be protected against chemicals that could attack the aluminum,
potting material or the cable.
The transducer can also malfunction due to corrosion. Implement some means of protec
tion if this danger exists.
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.
6.3 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate sufficiently to
divert some of the force to be measured, thus invalidating the measured value (force
shunt).
Notice
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. 6.1.

11
S2M
CONDITIONS ON SITE
The overload stop must
remain free
Fig. 6.1 Deposits at the marked areas must be avoided

S2M
MECHANICAL INSTALLATION
12
7 MECHANICAL INSTALLATION
7.1 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 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 the res
ulting dangers.
7.2 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 loadings and lat
eral forces can produce measurement errors and can destroy the transducer if limit val
ues are exceeded. Interference effects must be absorbed by suitable construction ele
ments, whereby these elements must not absorb any forces in the measuring direction of
the transducer. Screws, knuckle eyes and other customer‐side construction elements
must be screwed into the S2M in such a way that the construction element does not
touch the measuring body (potting material) even at full displacement.
Notice
Do not loosen the hexagon socket screws (Allen screws) that connect the force applica
tions and the overload stop with the measuring body, as otherwise the force transducer
calibration could become invalid.

13
S2M
MECHANICAL INSTALLATION
Rigid force transfer
Rigid force
transfer
correct incorrect
Fig. 7.1 Transducer orientation during installation
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), see Fig. 7.1.
Notice
Please note the maximum permissible loadcarrying capacity of the loading fittings and of
the tension/compression bars, screws and knuckle eyes.

S2M
MECHANICAL INSTALLATION
14
7.3 Mounting the S2M
7.3.1 Mounting with tension/compression bars
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 maximum operating load and then locked
in place.
1. Installation and locking with initial stress:
SScrew in the threaded connector
SPre‐stress transducer to 110% operating load in tensile direction
SHand‐tighten locknut
SRelieve load on transducer
The transducer itself can be used to measure the initial stress.
2. Installation and locking with torque
SScrew in the threaded connector
STighten locknut with a torque of 15Nm.
Notice
When locking, the tightening torque must not be shunted through the transducer.
7.3.2 Mounting with direct connection
In this mounting variant, the transducer is mounted directly on an existing construction
element and can then measure 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 screw connected to the rigid force transfer must be
tightened with a torque of 15Nm.
7.3.3 Mounting with knuckle eyes
Knuckle eyes prevent the application of torsional moments on the transducer and also,
when 2 knuckle eyes are used, bending moments, together with lateral and oblique
loadings. Although if two knuckle eyes are used, only tensile forces can be measured.
Knuckle eyes are suitable for use with quasi‐static loading (load cycles v10 Hz). Pliable
tension/compression bars should be used for dynamic loads with higher frequencies
(see Section 7.3.1).
1. Installation of knuckle eyes and locking with initial stress:
SRotate the locknut back to the eye.

15
S2M
MECHANICAL INSTALLATION
SScrew the knuckle eye completely into the transducer.
SUnscrew the knuckle eye 1 to 2 threads and align.
SLoad the transducer with 110% of the force that will occur during subsequent opera
tion in the tensile direction.
STighten the locknut by hand.
SRelieve the load on the transducer.
2. Installation of knuckle eye and locking with torque:
SRotate the locknut back to the eye.
SScrew the knuckle eye completely into the transducer.
SAlign the knuckle eye.
STighten the locknut with a torque of 15 Nm.
Notice
When locking, the tightening torque must not be shunted through the transducer.
Notes on mounting with knuckle eyes
1. Shaft diameter
When using a sensor with knuckle eyes mounted on one or both sides, make sure that the
shaft is the right size.
You will find the diameters of the knuckle eyes and shafts and their recommended
tolerances in the table below.
Knuckle eyes Nominal
diameter
Hole fitting
size
Recommended shaft
fitting size
1-U1R/200kg/ZGW 8 H7 g6
Tab. 7.1 Recommended fitting sizes/tolerances for shaft and hole

S2M
MECHANICAL INSTALLATION
16
Customer's construction
Customer's shaft holder
Shaft
Play based on recommended fitting
size, see Tab. 7.1, page 15
Threaded connector for mounting
on force transducers
Fig. 7.2 Example diagram of installation with knuckle eye
CAUTION
If a shaft with an overly small diameter is used, the bearing of the knuckle eye will be
subjected to linear load. This subjects the inner bearing shell to excessive load, which can
lead to damage and, if forces are high, can cause the knuckle eye bearing to break.
Select the shaft as recommended in the mounting instructions.
2. Distance between knuckle eye and shaft bearing
The shaft support must allow for suitable play between the knuckle eye and the shaft
bearing.

17
S2M
MECHANICAL INSTALLATION
CAUTION
If there is too much distance between the knuckle eye and the shaft bearing, this generates
bending moments in the shaft, causing it to deform.
This deformation puts strain on points of the edges of the inner bearing shell, which can
cause the knuckle eye or shaft to suffer damage or break.
Select the play as recommended in the mounting instructions.
To determine the play between the knuckle eye and the shaft bearing, please use the
details from the following table:
Knuckle eye Play between knuckle eye and shaft bearing
1-U1R/200kg/ZGW 0.8mm
Tab. 7.2 Determining the play between knuckle eye and shaft bearing
Customer's construction
Customer's shaft holder
Recommended play,
see Tab. 7.2, page 17
Threaded connector for mounting
on force transducers
Shaft
Fig. 7.3 Example diagram of installation with knuckle eye

S2M
MECHANICAL INSTALLATION
18
3. Shaft surface quality and hardness
The recommended surface roughness is ≤10 μm.
The shaft must have a minimum hardness of 50 HRC.
7.3.4 Installation with load button and thrust piece
For measuring compressive forces, the S2M can be equipped with a load button and ap
propriate thrust piece (available as accessories). To do this, the force transducer must be
screwed directly onto a construction element or suitable substructure. The force trans
ducer measures static and dynamic compressive forces, and can be used at full oscilla
tion width (peak-to-peak).
The substructure must be capable of absorbing the force to be measured. Remember
that the rigidity of the overall system depends on the stiffness of the force application
part and the substructure. Please also note that the substructure must ensure that the
force always has to be applied to the transducer vertically, i.e. there must be no inclina
tion, even under full load.
Force is applied to the top of the force transducer via the spherical load button
(1-U1R-200kg).
Install the load button with a minimum tightening torque of 15 Nm. We recommend using
our thrust pieces (1-EDO3/1kN) to guarantee ideal force application. These thrust pieces,
which are placed on the convex load button, have a suitable surface quality.
If you want to do without a thrust piece, please note that the surface of the structural
component that applies the force to the convex load application part must be ground and
have a minimum hardness of 40 HRC.