HBK PW27A User manual

PW27A
ENGLISH DEUTSCH FRANÇAIS
Mounting Instructions
Montageanleitung
Notice de montage

Hottinger Brüel & Kjaer GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbkworld.com
Mat.: 7-0201.0002-1
DVS: A05201 02 Y00 01
06.2023
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.

PW27A
ENGLISH DEUTSCH FRANÇAIS
Mounting Instructions

PW27A
TABLE OF CONTENTS
2
TABLE OF CONTENTS
1 Safety instructions 3................................................
2 Markings used 5....................................................
2.1 The markings used in this document 5.................................
2.2 Symbols on the product 5............................................
3 Conditions on site 7.................................................
3.1 Protection against corrosion 7........................................
3.2 Cleaning 7.........................................................
3.3 Deposits 7.........................................................
4 Mechanical installation 8............................................
4.1 Important precautions during installation 8..............................
4.2 Mounting 8........................................................
5 Electrical connection 10..............................................
5.1 Connecting in four‐wire and six‐wire configurations 10.....................
5.2 Cable protection (provided by customer) 11.............................
5.3 Shortening the cable 11...............................................
5.4 Cable extension 11...................................................
5.5 Parallel connection 11................................................
5.6 EMC protection 12...................................................
6 Dimensions 13......................................................
7 Accessories 14......................................................
8 Specifications 15....................................................

3
PW27A
SAFETY INSTRUCTIONS
1 SAFETY INSTRUCTIONS
In cases where a breakage could injure persons or damage equipment, the user must
take appropriate safety measures (such as safety devices to protect against falls,
collapses or overloads). For safe and trouble‐free operation, load cells must not only be
correctly transported, stored, sited and mounted but must also be carefully operated and
maintained.
It is essential to comply with the relevant accident prevention regulations. In particular
you should take into account the limit loads quoted in the specifications.
Intended use
Load cells are designed for metrological applications. Use for any additional purpose
shall be deemed to be not as intended.
In the interests of safety, load cells should only be operated as described in the Mounting
Instructions. 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.
Load cells can be used as machine elements (for tank weighing, for example). In these
situations, you must make sure that for greater sensitivity, the load cells are not
constructed with the customary safety factors found in machine design. Load cells are
not safety elements within the meaning of appropriate use. 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
Load cells are state‐of‐the‐art and reliable. Load cells can give rise to residual dangers if
they are inappropriately installed and operated by untrained personnel.
Everyone involved with siting, starting up, maintaining or repairing a load cell 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 load cells covers only a small area of
weighing technology. In addition, equipment planners, installers and operators should
plan, implement and respond to the safety engineering considerations of the weighing
technology in such a way as to minimize residual dangers. On‐site regulations must be
complied with at all times. Reference must be made to the residual dangers associated
with the weighing technology.

PW27A
SAFETY INSTRUCTIONS
4
Ambient conditions
With stainless steel single point load cells, please note that acids and all materials which
release ions will also attack all grades of stainless steel and their welded seams.
Should there be any corrosion, this could cause the load cell to fail. If this is the case, the
operator must take appropriate protective measures.
Unauthorized conversions and modifications are prohibited
Load cells 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
Load cells must only be installed by qualified personnel, strictly in accordance with the
specifications in conjunction with the safety requirements and regulations listed below. 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 siting, mounting, starting up and
operating the product, who possess the appropriate qualifications for their function.
Accident prevention
The prevailing accident prevention regulations must be taken into account, even though
the breaking load is well in excess of the full scale value. Pay particular attention to the
following data from the specifications
Slimit load (EL)
Slimit load at max. eccentricity
Slimit lateral loading (ELq)
Sbreaking load.
CAUTION
Load cells are precision measuring elements and must be handled carefully during mount
ing and transportation. Knocking or dropping the load cells can damage them. Suitable
retainers must be used during installation and operation to protect the load cells against
overloading. No forces or moments must be directed via the spring element during mount
ing.

5
PW27A
MARKINGS USED
2 MARKINGS USED
2.1 The markings used in this document
In this Manual, residual dangers are pointed out by symbols (see below).
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
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.
2.2 Symbols on the product
CE mark
The CE mark enables the manufacturer to guarantee that the product com
plies with the requirements of the relevant EC directives (the declaration of
conformity is available at http://www.hbm.com/HBMdoc).

PW27A
MARKINGS USED
6
Statutory waste disposal mark
In accordance with national and local environmental protection and mate
rial recovery and recycling regulations, old devices that can no longer be
used must be disposed of separately and not with normal household
garbage.

7
PW27A
CONDITIONS ON SITE
3 CONDITIONS ON SITE
Series PW27A load cells are hermetically encapsulated and are therefore not at all
sensitive to the influence of moisture and humidity. The transducers attain protection
class IP68 (test conditions: 100 hours under 1 m water column) and IP69K (water at high
pressure, steam cleaner), as per DIN EN60529. Nevertheless, the load cells must be
protected against constant humidity and moisture.
3.1 Protection against corrosion
The load cell must be protected against chemicals that could attack the transducer body
steel, or the cable.
Notice
Acids and all substances that release ions also attack stainless steels and their welded
seams.
Should there be any corrosion, this could cause the transducer to fail. If this is the case,
you must provide appropriate means of protection.
3.2 Cleaning
The load cell has been designed according to the EHEDG design guidelines to allow for
easy, mild cleaning. When mounting the load cell, make certain it can be reached from all
sides for cleaning. Cleaning can be performed without dismounting the load cell and
should be done regularly. The surface of the load cell must not be damaged with sharp-
edged brushes during cleaning.
3.3 Deposits
Dust, dirt and other foreign matter must not be allowed to accumulate sufficiently to
divert some of the measuring force onto the housing, thus invalidating the measured
value (force shunt).

PW27A
MECHANICAL INSTALLATION
8
4 MECHANICAL INSTALLATION
4.1 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 provide a suitable low‐ohm connection to electrically
bypass the transducer. HBM provides the highly flexible EEK ground cable for this
purpose, for example, that is 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
resulting dangers.
Notice
Load cells are precision measuring elements and need to be handled carefully. Dropping or
knocking the transducer may cause permanent damage. Make sure that the transducer
cannot be overloaded, including while it is being mounted.
4.2 Mounting
The load cells are firmly clamped at the mounting holes, the load is applied at the other
end. The scope of supply includes two seals for sealing the gap surfaces against
microbiological contamination.The recommended screws and tightening torques can be
found in the table below:
Version Thread Max. thread
reach
Min. property
class
Tightening
torque1)
Standard M6 14 mm 8.8 10 N⋅m
Rustless M6 14 mm A2-70 or A4-70 10 N⋅m
1) Recommendedvalue for the specified property class. Please comply with the screw manufacturer's
instructions with regard to screw dimensions.
Load must not be applied to the side where the cable connection is located, as this would
cause a force shunt.

9
PW27A
MECHANICAL INSTALLATION
Product contact area
Two seals
(in scope of
supply)
Load application/
platform center
Non-product contact area
Installation: 2x M6
The installation has to be done with sealed, easy-to-
clean and EHEDG certified M6 screws.
Freudenberg Hygienic USIT Washers 70 EPDM 291 for
M6 (HBM accessory number E-9278.0013) can be
used for sealing the screws.
* According to the EHEDG design guidelines a minimum distance of
6 mm is recommended for easy cleanability.
min. 6* min. 6*
Fig. 4.1 Installation according to hygienic design criteria

PW27A
ELECTRICAL CONNECTION
10
5 ELECTRICAL CONNECTION
The following can be connected for measurement signal conditioning:
Scarrier‐frequency amplifier
SDC amplifier
designed for strain gage measurement systems.
5.1 Connecting in four‐wire and six‐wire configurations
When load cells using a six‐wire configuration are connected to amplifiers with a
four‐wire configuration, the sense leads of the load cells must be connected to the
corresponding supply leads: marking (+) with (+) and marking (-) with (-).
4
Contact 1 (white) = Signal (+)
Contact 3 (black) = Excitation (-)
Contact 6 (gray) = Sense (-)
Contact 4 (blue) = Excitation (+)
Contact 5 (green) = Sense (+)
Contact 2 (red) = Signal (-)
Shield (yellow) = cable shield
connected to load cell body
Schematic diagram of a Pancon plug (CE100F26‐6), 6‐pin
12356
blue marking
Fig. 5.1 6‐wire cable connection

11
PW27A
ELECTRICAL CONNECTION
5.2 Cable protection (provided by customer)
Cable protection system*, comprising:
Unscrew the M10 sleeve and
replace with an M10
threaded tube coupling
* Supplier such as Flexicon, e‐mail: info@icp‐solutions.de
Screwed cable gland
Flexible cable
protection tubing*
Even without a cable protection system, standard load cells can achieve IP68/IP69K
degree of protection. In applications where the PUR cable of the load cell can be
chemically or mechanically attacked or destroyed, extra cable protection can be provided
by means of standard cable protection systems.
5.3 Shortening the cable
As the load cell connection uses a six‐wire configuration, you can shorten the 6‐wire load
cell cable without this changing the load cell calibration.
5.4 Cable extension
Use shielded, low‐capacitance measurement cables only for extension. Ensure that
connection is perfect, with a low contact resistance.
The cable of a six‐wire load cell can be extended with a cable of the same type.
5.5 Parallel connection
Only single point load cells with an aligned output (nominal (rated) sensitivity and output
resistance) are suitable for parallel connection. This option is not available with type
PW27 single point load cells.

PW27A
ELECTRICAL CONNECTION
12
5.6 EMC protection
Electrical and magnetic fields often induce interference voltages in the measuring circuit.
To ensure reliable measurement, however, the transducer must be able to transmit signal
differences of a few μV to the analysis unit without interference.
Planning the shielding design
Due to the numerous application options and differing local constraints, we can only
provide you with general information on correct connection. The shielding design suitable
for your application must be planned locally by an appropriate specialist.
HBM load cells with shielded, round cables are EMC-tested in accordance with the
EU Directive and bear the CE mark. Voltage surges as per EN 61000-4-5 can give rise to
deviations from the load cell’s specified accuracy. These surges in plants are caused by
lightning strikes or switching operations in power circuits, for example, and disappear
again when interference is no longer active. This is particularly evident with cables over
30 m long or if the equipment is used outdoors. Customers should take additional pre
cautions in these cases.
Please note:
SConnect the connecting cable shield all over the surface of the shielding electronics
housing. When using several load cells, connect the shields all over the surface of the
junction box (combination of transducer signals, e.g. type VKK2 from HBM). From
there, connect the measurement cable for the electronics over the surface of the
junction box and the shielding electronics housing.
SThe shield of the connecting cable must not be used for discharging potential
differences within the system. You must therefore lay sufficiently dimensioned
potential equalization lines to compensate for possible potential differences.
SUse shielded low-capacitance measurement cables only (HBM cables fulfill these
conditions).
SDo not route measurement cables parallel to electric cables, especially power lines
and control circuits. If this is not possible, protect the measurement cable, for
example with steel conduits.
SAvoid stray fields from transformers, motors and contact switches.

13
PW27A
DIMENSIONS
6 DIMENSIONS
C
C
C-C
Fitting depth,
min. 3 mm
30°
Ø27±0.02
Ø43.5
Ø38
24±0,1
M6
Ø12
Ø4.1±0.02
755±5
60
130±0.2
13.3
15.3
Ø16
14

PW27A
ACCESSORIES
14
7 ACCESSORIES
One set of replacement seals, consisting of two seals (EPDM), order no. E-9278.0015-1

15
PW27A
SPECIFICATIONS
8 SPECIFICATIONS
Information
Further product information can be found at www.hbm.com/pw.

PW27A
SPECIFICATIONS
16

PW27A
ENGLISH DEUTSCH FRANÇAIS
Montageanleitung

PW27A
INHALTSVERZEICHNIS
2
INHALTSVERZEICHNIS
1 Sicherheitshinweise 3...............................................
2 Verwendete Kennzeichnungen 5......................................
2.1 In dieser Anleitung verwendete Kennzeichnungen 5......................
2.2 Auf dem Gerät angebrachte Symbole 5.................................
3 Bedingungen am Einbauort 7.........................................
3.1 Korrosionsschutz 7.................................................
3.2 Reinigung 7........................................................
3.3 Ablagerungen 7.....................................................
4 Mechanischer Einbau 8..............................................
4.1 Wichtige Vorkehrungen beim Einbau 8.................................
4.2 Montage 8.........................................................
5 Elektrischer Anschluss 10............................................
5.1 Anschluss in Vier‐ und Sechsleiter‐Technik 10............................
5.2 Kabelschutz (kundenseitig vorzusehen) 11...............................
5.3 Kabelkürzung 11.....................................................
5.4 Kabelverlängerung 11................................................
5.5 Parallelschaltung 11..................................................
5.6 EMV-Schutz 12......................................................
6 Abmessungen 13....................................................
7 Zubehör 14.........................................................
8 Technische Daten 15.................................................