HBM C16i series User manual

Mounting Instructions | Montageanleitung |
Notice de montage
English Deutsch Français
C16i

Hottinger Brüel & Kjaer GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com
Mat.: 7-0101.0035
DVS: A05516_01_Y00_01 HBM: public
05.2021
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 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
C16i

2A05516_01_Y00_01 HBM: public C16i
English
1 Safety instructions 3........................................
2 Markings used 6............................................
2.1 The markings used in this document 6..........................
2.2 Symbols on the product 6.....................................
3 Scope of supply 7..........................................
3.1 Mounting accessories (optional) 7..............................
4 Mounting 8.................................................
4.1 Mounting procedure 10........................................
4.2 Procedure for special mounting situations 13.....................
5 Electrical connection 16......................................
5.1 Bus wiring of several load cells 17...............................
5.2 Power supply 17..............................................
5.3 Command set C16i... 21.......................................
6 Options 22..................................................
7 Specifications 23............................................
8 Dimensions 24..............................................

Safety instructions
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1 Safety instructions
In cases where a breakage would cause injury to persons or damage to equip
ment, the user must take appropriate safety measures (such as fall protection,
overload protection, etc.). For safe and trouble‐free operation, the load cell has
to be correctly transported, stored, sited and installed and must also be care
fully 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 specifica
tions.
Use in accordance with the regulations
The C16i... type digital load cell is conceived for weighing applications. Use for
any additional purpose shall be deemed to be not in accordance with the regu
lations.
In the interests of safety, the load cell must only be operated as described in
the Mounting instructions. It is also essential to observe the appropriate legal
and safety regulations for the application concerned during use. The same
applies to the use of accessories.
Take into account the maximum limit loads given in the Technical data. The
technical data for the load cell applies within the specified load limits only.
The electronic system processing the measurement signal must be designed
such that no consequential damage is caused by the failure of the measure
ment signal.
The load cell can be used as machine components. Please note that in these
cases, in order to achieve high sensitivity, the load cell has not been designed
with the safety factors normally applied in machine design.
The digital load cell is not a safety element within the meaning of its use as
intended. Proper and safe operation of this load cell requires proper transporta
tion, correct storage, assembly and mounting and careful operation and main
tenance.

Safety instructions
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General dangers due to non‐observance of the safety instructions
The C16i... load cell correspond to the state of the art and are fail‐safe. The
load cell can give rise to residual dangers if it is inappropriately installed and
operated by untrained personnel.
Everyone involved with the installation, commissioning, maintenance or repair
of a force transducer 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 cell covers only a small area
of weighing technology. In addition, equipment planners, installers and opera
tors should plan, implement and respond to the safety engineering consider
ations of weighing technology in such a way as to minimize residual dangers.
Prevailing regulations must be complied with at all times. There must be refer
ence to the residual dangers connected with weighing technology.
Environmental conditions
In the context of your application, please note that all materials which release
chlorine ions will attack all grades of stainless steel and their welding seams. In
such cases the operator must take appropriate safety measures.
Conversions and modifications
The load cell 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
This load cell is only to be installed by qualified personnel strictly in accordance
with the technical data and with the safety rules and regulations. It is also es
sential to observe the appropriate legal and safety regulations for the applica
tion concerned. The same applies to the use of accessories.
Qualified personnel means persons entrusted with the installation, fitting, com
missioning and operation of the product who possess the appropriate qualifica
tions for their function.

Safety instructions
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Prevention of accidents
Although the specified breaking load in the destructive range is several times
the nominal capacity, the relevant accident prevention regulations from the
trade associations must be taken into consideration.

Markings used
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2 Markings used
2.1 The markings 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
WARNING This marking warns of a potentially dangerous
situation in which failure to comply with safety
requirements 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
information 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
references to other chapters and external documents.
2.2 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).

Scope of supply
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3 Scope of supply
SPendulum load cell with connection cable, flexible tube and tube clip
SDowel pin for rotation stop device (Load introduction parts have to be or
dered separately)
SPlastic bag with grease
SMounting instructions
3.1 Mounting accessories (optional)
Thrust pieces
Mounting variation 1:
SC16/ZOU44A
Thrust pieces (stainless steel) for above and below
(1 Set = 2 pcs.), for use with C16.../≤60 t up to a
max. load per load cell of 40 t, incl. 3 excentric washers
Mounting variation 2:
SEPO3/50t
Thrust piece for above, incl. spanner
SC16/EPU44A
Thrust piece for below, incl. 3 excentric washers

Mounting
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4 Mounting
General hints
SPlease handle the load cell carefully.
SUse appropriate lifting gear when mounting the weighing device.
SDo not overload the load cell, not even for a short time (e.g. due to
unevenly distributed supporting loads).
SIf required, use supporting elements (dummies) of the same height for
alignment purposes.
The C16i... is a pendulum load cell designed to automatically restore the
mounting construction to a stable initial position in the case of a lateral dis
placement of the load introduction (= skewing of the load cell). The maximum
permissible lateral displacement or skewing (see chapter 8 “Dimensions”) must
not be exceeded, otherwise the load cells or load introduction parts might be
damaged. The easiest and most common solution for this problem are the ap
propriate stops on the mounting construction (weighing platform) which must
be carefully adjusted within the specified values.
With the C16i..., we recommend the use of EPO3/50t and C16/EPU44A or
C16/ZOU44A mounting accessories from HBM, because they permit easy
mounting. The rotation stop device welded onto the load cells and the dowel
pin provided are also suitable for this model type (see chapter 8 “Dimensions”).
Preparation work for mounting
When using EPO3/50t, C16/EPU44A or C16/ZOU44A to introduce and carry
off the load, the following preparations have to be made: A dowel pin is en
closed in the packing for every load cell. This dowel pin and the rotation stop
welded onto the load cell prevent a potential transducer microrotation, thus pre
venting the cable from being damaged. Use a hammer to drive in the dowel pin
until it rests in the load introduction part's pocket bore. Radially position the
open side of the dowel pin.

Mounting
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CAUTION
or
Position of rotation stop dowel pin:
Radially position open side!
The bore depth ensures correct fitting of the pin. Only one load introduction
part per load cell must be equipped with this pin. This load introduction part
must be mounted below the load cell to enable the dowel pin to engage into the
rotation stop recess (see chapter 8 “Dimensions”). No pin must be introduced
into the bore on the upper load introduction part.
Tip
Please also refer to and comply with the special notes at the end of this chap
ter.
The areas or foundations below the lower load introduction part (for carrying off
the load) and above the upper load introduction part should be as even and
level as possible.
Practically drill the required borings for securing and fixing on the weighbridge
resp. tank and base plate before you mount the weighing platform. The dimen
sions for use with EPO3/50t and C16/EPU44A or C16/ZOU44A are as shown
in the dimensioned drawings in chapter 8.

Mounting
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4.1 Mounting procedure
Below, we use a weighbridge as an example for the mechanical installation.
We recommend that you proceed as follows:
SUse appropriate lifting gear to lift one face of the weighbridge that has al
ready been centered.
SPrepare the load introduction parts and mount the part with the rotation stop
dowel pin below and the load introduction part without the dowel pin above.
The lower load introduction part must be aligned such that the dowel pin
points in the direction in which, later on, the cable outlet and the type plate
are to be point, although do not yet finally fix it.
CAUTION
or
Position of rotation stop dowel pin:
Radially position open side!
SUse a sufficient amount of the grease provided with the load cells to protect
from wear, tear, dirt and corrosion the upper and lower load introduction
parts in the load carrying element, the dowel pin and the rotation stop on
the load cell.

Mounting
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CAUTION
Grease load introduction
parts and dowel pin
SFix the lower load introduction parts with a spanning washer when using
EPO3/50t or eccentric washers when using C16/EPU44A or C16/ZOU44A.
For subsequent sealing of the flexible tube, mount the tube clip supplied
with the load cell around the lower compression pad.
SNow insert the load cells by rotating them into the lower load introduction
part such that the dowel pin engages into the rotation stop recess.
SNow let down the weighbridge carefully such that there is just no load on
the load cells and that they can be aligned perpendicularly. At the same
time, introduce the load cells' upper load introduction parts into the upper
load carrying element. For this purpose, you can move the lower load
introduction element with the eccentric washers loosened. We recommend
that you use an appropriate prism level to check the load cell's
perpendicular mounting position by holding it against the cylindrical housing
tube. Then let down the bridge and proceed in the same way for the other
face.

Mounting
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CAUTION
Align load cells vertically!
SAfter finishing themounting procedure, once again check the perpendicular
mounting position for all the load cells, with the bridge swinging free and if
required, lift the bridge to correct the position. Exact mounting is an
important condition for accurate measurements and minimum corner
deviation.
SOnce the final perpendicular alignment of all load cells has been completed,
turn the eccentric washers towards the load introduction part and secure by
tightening the fixing screws.
STurn the flexible tube already mounted on the load cell down over the
compression pad and directly fix it on the compression pad using the tube
clip.
CAUTION
There is no warranty in case of un-lubricated compression pads and if the flexi
ble tube has not been mounted correctly!

Mounting
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4.2 Procedure for special mounting situations
If there are extremely long distances between the supports of the load cells or
if the weighbridges bend easily, the rolling movements of the load cell pro
duced by a load can cause discrepancies in the results. This rolling motion is
assisted by a lateral drift of the upper load cell load introduction points under
load, if the contact zone between the load introduction part and the load cell is
far below the neutral bending axis of the weighbridge. To minimize the discrep
ancies which occur in these cases, the load cells can be mounted at a slight
slant, set to a maximum of 1°inwards.
neutral bending axis
unloaded
neutral bending axis
initial state (unloaded)
loaded
Alternatively, thin steel plates (approx. 0.5 mm thick) can be placed under one
side, under the load introduction parts, at the given points.
Steel plates

Mounting
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Structurally, this effect can be counteracted by shifting the bearing points on
the weighbridge as far upward as possible, towards the neutral bending axis.
CAUTION
Before loading the bridge for the first time by driving on it with a truck / vehicle,
do in any case adjust the lateral stops such that the load cells' permissible
skewings or lateral displacements of the load introduction parts are not ex
ceeded (see chapter 8 “Dimensions”). Otherwise, the load cells or load
introduction parts might be damaged.
CAUTION
Adjust lateral stops of
the weighing platform
Notice
Type C16i... load cell is metal‐clad by laser‐welding and made from rustproof
materials. Therefore they comply with protection class IP68 according to EN 60
529 (IEC 529) under the stated test conditions (see chapter 7 “Specifications”).
In general, the load cell permit steam jet cleaning. However, the conditions for
max. pressure, temperature, etc., stated in the EN 60 529 for protection class
IP69K, must be observed.
When EPO3/50t, C16/EPU44A or C16/ZOU44A mounting parts from HBM are
used, the integral rotation stop device, described in chapter 4 “Mounting”, can
be used. With customized mounting parts, HBM provides drawings showing
the position and mounting of the rotation stop. In this case, special attention
must be paid to the observance of the tolerances stated for the dowel pin posi
tion, to prevent the load cells from being damaged.

Mounting
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Important
Only when the HBM specifications are followed will the HBM warranty for the
product be valid.
The C16/ZOU44A load introduction parts accessory kit can be used as an eco
nomical alternative for load cells with nominal loads up to 60 t.
Important
In this case, however, the maximum load for each load cell must not exceed
40 t.

Electrical connection
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5 Electrical connection
Position the load cell cable so that any condensation water or moisture forming
on the cable can drip off. It must not be routed to the load cell. In addition,
make sure that no dampness can penetrate the open end of the cable.
Furthermore, the cable must be placed such that the cable sheath suffers no
damage, e.g. from potential abrasion because of the load cell's propermotion.
Electrical and magnetic fields often are the cause for the introduction of dis
turbing voltages into the measuring circuit.
The optional cable with an outer braided wire covering for the C16i with option
20R, is intended for use when there is increased mechanical stress (e.g. dam
age caused by gnawing rodents). If this cable is used, the outer braided wire
has to be connected to potential equalization at least once, to avoid accidental
energization. This outer braided wire is not used to shield the load cell. The
inner braid of the load cell cable is used for shielding.
Therefore:
SUse shielded low‐capacitance cable only (HBM cables meet these
requirements)
SDo not lay the measuring cables in parallel to power cables, especially
high‐tension and control lines. If this is not pssible, use steel conduits, for
example, to protect and shield the measuring cables
SAvoid the stray fields resulting from transformers, motors and contactors

Electrical connection
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5.1 Bus wiring of several load cells
The bus wiring of several load cells come into being by joining together the
connection cables' core ends with identical colors. HBM recommend the use of
a junction box without dropping resistors (e.g. VKD2R-8).
UB
GND
RB (RX+)
RA (RX-)
TB (TX+)
TA (TX-)
white red grey green black blue
GND UB RB (RX+) RA (RX-) TB (TX+) TA (TX-) GND UB RB (RX+) RA (RX-) TB (TX+) TA (TX-)
Converter
(SC232/422B)
PC
C16i ... C16i ...
RS-232
RS-485 / 4-wire BUS
white red grey green black blue
Fig. 5.1 Wiring code
5.2 Power supply
The load cell features a digital output with RS-485 (4-wire) interface. For the
power supply a DC supply voltage is required.
Power supply unit selection for C16i...
Procedure for selecting a suitable power supply unit to supply power to the in
terface converter and the connected C16i... load cells:
1. Determine the required cable length between power supply unit and junction
box by examining the actual on site situation.
2. In the table below, read off actual power consumption values in relation to
the number of load cells used.
3. Select cable cross-section in the relevant line such that the required cable
length can be implemented. With a 15 VDC nominal voltage, it is always

Electrical connection
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possible to implement longer cables or smaller wire cross-sections than with
a 12 VDC rating.
4. Read off voltage and minimum current for the (plug-in type) power supply
unit required. The power supply unit should be electronically controlled.
5. Both of the tables below (for C16i3 or the new C16i4 load cells) specify the
maximum possible cable length between the junction box and weighing
display when the power is supplied via a weighing display (also see
Fig. 5.2).
However, if the cable length required on site is longer, then there is an
option to supply the load cells with an external power supply directly via the
junction box. Cable lengths of up to a maximum of 500m can thus be
achieved (see Fig. 5.3).
If type C16i3 and C16i4 load cells are used simultaneously in a weighing
device (e.g. due to maintenance work), then the maximum possible cable
length when power is supplied via the weighing display can be calculated on
our website:https://www.hbm.com/c16i-converter
For C16i4 (fourth generation – expected to be available from mid 2021)
The generation can be clearly identified by the item number.
The item number is detailed on the bottom row of the load cell type plate and
on the packaging label.
Assumptions:
SEstimated intrinsic consumption of the junction box of 30mA, with activated
bus terminator (as, for example, on 1-VKD2R-8 from HBM)
SLength of the load cell cable 40m (max. length), with a wire cross-section
of 0.14mm²