HBM PW27A User manual

Mounting Instructions | Montageanleitung |
Notice de montage
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PW27A

Hottinger Baldwin Messtechnik GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com
Mat.: 7-0201.0002-1
DVS: A05201_02_Y00_00 HBM: public
04.2019
EHottinger Baldwin Messtechnik 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 allgemeiner
Form. Sie stellen keine Beschaffenheits- oder Haltbarkeits
garantie 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.

Mounting Instructions | Montageanleitung |
Notice de montage
English Deutsch Français
PW27A

2A05201_02_Y00_00 HBM: public PW27A
English
1 Safety instructions 3........................................
2 Markings used 6............................................
2.1 Symbols on the product 6.....................................
2.2 The markings used in this document 7..........................
3 Conditions on site 8........................................
3.1 Protection against corrosion 8.................................
3.2 Cleaning 8..................................................
3.3 Deposits 8..................................................
4 Mechanical installation 9....................................
4.1 Important precautions during installation 9......................
4.2 Mounting 10..................................................
5 Electrical connection 11......................................
5.1 Connecting in four‐wire and six‐wire configurations 11.............
5.2 Cable protection (provided by customer) 12......................
5.3 Shortening the cable 12.......................................
5.4 Cable extension 12...........................................
5.5 Parallel connection 13.........................................
5.6 EMC protection 13............................................
6 Dimensions 14..............................................
7 Specifications 15............................................

Safety instructions
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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.

Safety instructions
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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.
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

Safety instructions
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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 mounting and transportation. Knocking or dropping the load cells can
damage them. Suitable retainers must be used during installation and opera
tion to protect the load cells against overloading. No forces or moments must
be directed via the spring element during mounting.

Markings used
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2 Markings used
2.1 Symbols on the product
CE mark
The CE mark enables the manufacturer to guarantee that
the product complies with the requirements of the rele
vant EC directives (the declaration of conformity is avail
able at http://www.hbm.com/HBMdoc).
Statutory waste disposal mark
In accordance with national and local environmental pro
tection and material recovery and recycling regulations,
old devices 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.

Markings used
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2.2 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
CAUTION This marking warns of a potentially dangerous situa
tion in which failure to comply with safety require
ments 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.
Emphasis
See….
Italics are used to emphasize and highlight text and
references to other chapters and external documents.

Conditions on site
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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 dis
mounting 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).

Mechanical installation
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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.

Mechanical installation
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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.
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

Electrical connection
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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

Electrical connection
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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.

Electrical connection
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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.
5.6 EMC protection
Electrical and magnetic fields often induce interference voltages in the
measuring circuit. Therefore:
SUse shielded, low‐capacitance measurement cables only (HBM cables fulfill
both conditions)
SDo not route the measurement cables parallel to power lines and control
circuits. If this is not possible, protect the measurement cable, in rigid steel
conduits, for example
SAvoid stray fields from transformers, motors and contact switches
To ensure the best EMC protection, the load cell, together with the connection
cable and the subsequent electronics, should be placed in a shielded housing.
Exception
Load cells with shielded, round cables are EMC‐tested in accordance with EC
directives and identified by CE certification. But you must make sure that the
connection cable shield is connected to the shielded housing of the electronics.

Dimensions
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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

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

Specifications
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8 Specifications
Information
Further product information can be found at www.hbm.com/pw.

Mounting Instructions | Montageanleitung |
Notice de montage
English Deutsch Français
PW27A

2A05201_02_Y00_00 HBM: public PW27A
Deutsch
1 Sicherheitshinweise 3......................................
2 Verwendete Kennzeichnungen 6.............................
2.1 Auf dem Gerät angebrachte Symbole 6.........................
2.2 In dieser Anleitung verwendete Kennzeichnungen 7..............
3 Bedingungen am Einbauort 8...............................
3.1 Korrosionsschutz 8..........................................
3.2 Reinigung 8.................................................
3.3 Ablagerungen 8.............................................
4 Mechanischer Einbau 9.....................................
4.1 Wichtige Vorkehrungen beim Einbau 9.........................
4.2 Montage 10..................................................
5 Elektrischer Anschluss 11....................................
5.1 Anschluss in Vier‐ und Sechsleiter‐Technik 11....................
5.2 Kabelschutz (kundenseitig vorzusehen) 12.......................
5.3 Kabelkürzung 12..............................................
5.4 Kabelverlängerung 12.........................................
5.5 Parallelschaltung 13...........................................
5.6 EMV‐Schutz 13...............................................
6 Abmessungen 14............................................
7 Zubehör 15..................................................
8 Technische Daten 16.........................................