HBM RTN/M2 Series User manual

Mounting Instructions | Montageanleitung |
Notice de montage | Instrucciones de montaje
English Deutsch Français Español
RTN/M2…
RTN/M2LAR, RTN/M2LA,
RTN/M2LBR, RTN/M2LB

Hottinger Brüel & Kjaer GmbH
Im Tiefen See 45
D-64293 Darmstadt
Tel. [phone]
Fax [phone]
[email protected]
www.hbm.com
Mat.: 7-2001.1088
DVS: A01867_02_YS0_02 HBM: public
07.2021
EHottinger Baldwin Messtechnik
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.
Reservado el derecho a modificaciones.
Todos los datos describen nuestros productos de manera
general. No representan ninguna garantía de calidad o de
durabilidad.

Mounting Instructions | Montageanleitung |
Notice de montage | Instrucciones de montaje
English Deutsch Français Español
RTN/M2…
RTN/M2LAR, RTN/M2LA,
RTN/M2LBR, RTN/M2LB

2A01867_02_YS0_02 HBM: public RTN/M2…
English
1 Safety instructions 3........................................
2 Markings used 5............................................
2.1 The markings used in this document 5..........................
3 General 6..................................................
4 Mounting preparation 8.....................................
5 Mounting 12.................................................
6 Dimensions 16..............................................
7 Specifications of the RTN/M2L... weighing modules 22.........

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.).
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 weighing modules have been designed for weighing applications. Use for
any additional purpose shall be deemed to be not in accordance with the
regulations.
In the interests of safety, the weighing modules should 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.
The weighing modules are not safety elements within the meaning of its use as
intended. Proper and safe operation of this weighing module requires proper
transportation, correct storage, assembly and mounting and careful operation
and maintenance.
General dangers due to non‐observance of the safety instructions
The weighing modules correspond to the state of the art and are fail‐safe. The
weighing modules can give rise to residual dangers if they are inappropriately
installed and operated by untrained personnel.
Everyone involved with the installation, commissioning, maintenance or repair
of a weighing module 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 weighing modules covers only a
small area of weighing technology. In addition, equipment planners, installers
and operators should plan, implement and respond to the safety engineering

Safety instructions
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considerations of weighing technology in such a way as to minimise residual
dangers. Prevailing regulations must be complied with at all times. There must
be reference 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.
With environmental conditions that cannot be clearly defined, HBM recom
mends to provide the load cells and weighing modules with a protective coating
which matches these conditions (after mounting) in order to prevent the influ
ence of aggressive media. Please take into account the resistance of the cable
material and the mounting parts.
Prohibition of own conversions and modifications
The weighing modules 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
These weighing modules are only to be installed by qualified personnel strictly
in accordance with the specifications and with the safety rules and regulations
which follow. 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 the installation, fitting,
commissioning and operation of the product who possess the appropriate
qualifications for their function.
Accident prevention
Although the specified brealing load is several times the full scale value, the
relevant accident prevention regulations from the trade associations must be
taken into consideration.

Markings used
RTN/M2… A01867_02_YS0_02 HBM: public 5
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
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.
Emphasis
See….
Italics are used to emphasize and highlight text and
references to other chapters and external documents.

General
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3 General
HBM offers the RTN/M2(L)... weighing module for RTN load cells with max.
capacities of 1 t ... 33 t. The ”L” in the type designation signifies that the mod
ule has been fitted with a stay rod. “A” signifies rubber‐metal bearing, “B”
stands for pendulum bearing.
Product types RTN/M2LA...
Order number Max. capacity
for load cell
Material Version
1-RTN/M2LAR2.2T 1 t ... 2.2 t stainless steel WITH stay rod
1-RTN/M2AR2.2T WITHOUT stay rod
1-RTN/M2LAR4.7T 4.7 t stainless steel WITH stay rod
1-RTN/M2AR4.7T WITHOUT stay rod
1-RTN/M2LAR22T 10 t ... 22 t stainless steel WITH stay rod
1-RTN/M2AR22T WITHOUT stay rod
1-RTN/M2LA33T 33 t galvanized WITH stay rod
1-RTN/M2A33T WITHOUT stay rod
Product types RTN/M2LB...
Order number Max. capacity
for load cell
Material Version
1-RTN/M2LBR4.7T/2 1 t ... 4.7 t stainless steel WITH stay rod
1-RTN/M2BR4.7T/2 WITHOUT stay rod
1-RTN/M2LBR22T 10 t ... 22 t stainless steel WITH stay rod
1-RTN/M2BR22T WITHOUT stay rod
1-RTN/M2LB33T 33 t galvanized WITH stay rod
1-RTN/M2B33T WITHOUT stay rod

General
RTN/M2… A01867_02_YS0_02 HBM: public 7
The weighing modules have been primarily designed for use in tank weighing.
As a rule, the weighing modules are equipped with adjustable limit stops that
limit horizontal movements, for example by wind forces or in mixer operation.
In addition, the modules are provided with a anti‐liftoff device which prevents
the tank from lifting off. However, ensure that the specified data (see chapter 7
on page 22) are not exceeded.
The modules comprise a lower module plate for mounting on the basic
construction (foundations), a load cell dummy with load introduction elements
and the upper module plate for tank mounting. For load introduction into the
load cell, a rubber‐metal bearing (with RTN/M2LA) or a pendulum bearing (with
RTN/M2LB)is used which allows for horizontal shifting of the load applied. The
weighing modules are completely fitted with a load cell dummy that can be
loaded, with a ground cable, and a securing device for transport.

Mounting preparation
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4 Mounting preparation
CAUTION
The weighing modules are delivered completely assembled, however, without a
load cell. Instead of the load cell, a dummy has been assembled into the
weighing module, which is capable of taking up the specified loads. Before the
weighing module is mounted underneath the tank, vessel or silo, check
whether dummy replacement through the load cell will still be possible even if
the tank is placed on the weighing module. In order to effect the replacement, a
suitable lifting device is necessary that is capable of lifting the tank by at least
10 mm. Pipe connections mounted on the tank or the feed‐in or discharge sys
tems have to be vertically movable or separable.
Notice
If this is not the case, the dummy must be replaced by an appropriate RTN
load cell already before the weighing module is mounted.
General mounting preparations
SEnsure that the assembly/siting areas provided are clean, level and horizon
tally aligned. Any askew positions can be compensated for, depending on
the assembly situation, for example by appropriate wedges and compensa
tion plates (weld in position) or by grinding down the assembly area. How
ever, module plates must not be ground down under any circumstances.
SThe foundations / basic construction and the connection of the
superstructure must be sufficiently rigid in order to avoid deformations (e.g.
deflections) under load.
SIn order to provide for fitting and assembly free from any constraining
forces, the mounting bores on the basic construction and the tank connec
tion must be sufficiently aligned.

Mounting preparation
RTN/M2… A01867_02_YS0_02 HBM: public 9
SAn even loading on the bearing points is to be sought. To this end, in partic
ular for statically indefinite bearings, ensure that the height level setting at
the bearing points is correct (provide spacer plates, 5 x 1 mm included in
scope of delivery).
SUndo transport protection device and stops, fit height adjustment plates
(dependent on maximum capacity, see Dimensions).
Notice
How to use the enclosed grease tube
Before fitting the load cell, the enclosed grease must be applied to the upper
thrust piece and to the underside of the pendulum bearing (with RTN...B) in
order to minimize friction between the inside surface of the thrust piece and the
load introduction element of the RTN load cell or pendulum bearing.
Use of the spacer plates provided
The scope of delivery of the module includes 2 x 5 spacer plates. They are
used for the vertical adjustment of the module. Five plates max. are to be fitted
underneath the upper module plate, and five plates max. between the base
and the cross bracket of the anti‐liftoff device
Important
Ensure that all screws are fitted with U‐washers.

Mounting preparation
10 A01867_02_YS0_02 HBM: public RTN/M2…
5 plates max. for
height adjustment
5 plates max. for height adjustment
Upper module plate
Centering disc
(only up to 4.7 t
max. capacity)
Lateral stops
Cross‐bracket
(Anti‐liftoff device)
Air gap: 1 mm
Mounting base
(only up to 4.7 t
max. capacity)
Bearing
Dummy
Fig. 4.1 Fitting of the spacer plates with 4.7 t version

Mounting preparation
RTN/M2… A01867_02_YS0_02 HBM: public 11
5 plates max. for
height adjustment
5 plates max. for height adjustment
Upper module plate
Lateral stops
Cross‐bracket
(Anti‐liftoff device)
Air gap: 1 mm
Bearing
Dummy
Fig. 4.2 Fitting of the spacer plates with 10 t ... 33 t version

Mounting
12 A01867_02_YS0_02 HBM: public RTN/M2…
5 Mounting
SWhen fitting the tank, vessel or silo, ensure that e.g. when lowering it onto
the bearing points no shock loads act upon the module. Even short term
loads that exceed the load cell limit values can result in damage to the load
cell.
SFor heavy containers or unfavourable fitting conditions, the use of
appropriate fitting aids (auxiliary supports, lifting devices) is required.
SLower module plate and upper module plate are to be firmly connected with
the foundations or tank connection.
SThe weighing modules must be assembled such that, in their original state,
they are free from lateral forces. The pendulum bearing version requires the
fitted pendulum bearing to be aligned exactly vertically, if possible. This is
the case, if foundations and tank connection are horizontal and the mount
ing bores on the basic construction and the container connection are suffi
ciently aligned. Slotted holes in the module plates facilitate alignment.
SFor protection against welding currents which may destroy the electronic
components of the transducer the fitted EEK4 ground cable is provided.
SEspecially in the case of a statically indefinite bearing uneven loading of the
modules can occur due to an insufficiently precise height adjustment. This
unevenness is to be checked on the individual load cells by applying an
excitation voltage and comparing the output voltages. In order to avoid any
overloads, major unevenness is to be compensated by inserting spacer
plates on the bearings with the lowest loads.
Mounting of the load cell
In order to assemble the load cell into the weighing module the pre‐fitted
dummy needs to be removed.
Mounting of load cells up to a max. capacity of 4.7 t: see Fig. 4.1
SRemove the anti‐liftoff device by undoing the 2 hexagonal screws
SLoosen the lateral stops
SUse a suitable lifting device to lift the respective tank base by approx.
10 mm

Mounting
RTN/M2… A01867_02_YS0_02 HBM: public 13
SUndo the centering discs
SRemove the dummy with the mounting base of the RTN by lifting lightly and
withdrawing to one side (for pendulum bearing version, with pendulum
bearing)
SRemove mounting from dummy and fit to load cell; tightening torque of the
4 screws: 4 N⋅m
SSecure and position load cell with mounting base by means of centering
discs on the lower module plate. Apply the enclosed grease to the load
introduction parts of the load cell.
SWith the pendulum bearing version, position the pendulum bearing on the
load cell. Also apply grease.
SSlowly lower the tank while making sure that the load buttons engage with
the corresponding seats without suffering damage.
SVertical module alignment by inserting or removing the five 1‐mm‐thick
spacer plates underneath the upper module plate.
SMount and adjust the anti‐liftoff device by inserting plates underneath such
that an air gap of about 1 mm results (see Fig. 4.1) with the tank empty.
SFirst adjust and then lock the horizontal stops. The U‐shaped bracket ac
counts for the stiffness of the stops and has to be fastened with the stop
screws. Please refer to the Specifications in chapter 7 for the maximum per
missible horizontal shifts (distance from the stops). The stay rods already
have been adjusted at the factory to ensure that the load introduction parts
are aligned with the load cell in the rod direction. Should a readjustment
prove necessary, the rod end bearings subsequently have to be carefully
locked.
Mounting of load cells with a max. capacity of 10 t, 15 t, 22 t and 33 t:
see Fig. 4.2
SRemove the anti‐liftoff device by undoing the 2 hexagonal screws
SUse a suitable lifting device to lift the respective tank base by approx.
10 mm

Mounting
14 A01867_02_YS0_02 HBM: public RTN/M2…
SRemove the load cell dummy without the mounting base with thrust piece
by lifting lightly and withdrawing to one side (for pendulum bearing version,
with pendulum bearing)
SInsert the load cell with the thrust piece and, if necessary, the pendulum
support, apply the enclosed grease to the load introduction parts.
SSlowly lower the tank. The thrust piece above the load cell must center in
the centering flange of the upper module plate without suffering damage.
SVertically align the module by inserting or removing the five 1‐mm‐thick
spacer plates above the thrust piece of the load cell (see Fig. 4.2)
SMount and adjust the anti‐liftoff device by inserting spacer plates
underneath such that an air gap of about 1 mm results with the tank empty.
SFirst adjust and then lock the horizontal stops. The U‐shaped bracket
accounts for the stiffness of the stops and has to be fastened with the stop
screws. Please refer to the Specifications in Chapter 7 for the maximum
permissible horizontal shifts (distance from the stops). The stay rods
already have been adjusted at the factory to ensure that the load introduc
tion parts are aligned with the load cell in the rod direction. Should a read
justment prove necessary, the rod end bearings subsequently have to be
carefully locked.
Notes for adjustment of the horizontal stops
Horizontal movability is ensured by the rubber‐metal or pendulum bearing. The
horizontal stops should be adjusted in compliance with the maximum permissi
ble horizontal shift (see chapter 7 on page 22).
Notice
Precautions during operation:
SDeposits such as dirt or corrosion particles from the tank can falsify
measurement results.
SThe limits for movability and loading capacity specified in the Specifications
must not be exceeded.

Mounting
RTN/M2… A01867_02_YS0_02 HBM: public 15
SHorizontal shifts that exceed the maximum permissible value and do not act
in the direction of the stay rod are to be avoided by aligning the other mod
ules appropriately, or to be taken up by other stops or devices.
SThe movement tolerance of the stay rod should be checked regularly and
readjusted, if necessary.

Dimensions
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6 Dimensions
RTN/M2LA - Version with rubber‐metal bearing
60
8
111
8
30 8
153 17
only version with
stay rod
max. 5 spacer plates
(110 - 115 by
spacer plates)
230
100
100100
160
25
15
View from above
20
15
View from below
230
100
100100
160
25
15
15
20
Max. capacity 1 t ... 4,7 t
Perspective view
Dimensions in mm
(1mm = 0.03937 inches)

Dimensions
RTN/M2… A01867_02_YS0_02 HBM: public 17
RTN/M2LA - Version with rubber‐metal bearing
1022
65
148
10
10 151
255
max. 5 spacer plates
only version with stay rod
(150 - 155 by
spacer plates)
Max. capacity 10 t ... 22 t
Perspective view
310
140130
140
18
200
View from above
20
25
View from below
310
140130
140 200
25
20
18
20
20 Dimensions in mm
(1mm = 0.03937 inches)

Dimensions
18 A01867_02_YS0_02 HBM: public RTN/M2…
RTN/M2LA - Version with rubber‐metal bearing
View from above
View from below
Max. capacity 33 t
Perspective view
85
188
12 12
193
290
max. 5 spacer plates
only version with stay rod
1226
(192 - 197 by
spacer plates)
420
200155
200 280
35
420
200155
200 280
35
22
26
26
22
35
35 Dimensions in mm
(1mm = 0.03937 inches)