HBM U2A User manual

A1261-2.2 en/de/fr
Load cells
Wägezellen
Pesons
U2A
Mounting instructions
Montageanleitung
Notice de montage

English Page 3 − 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deutsch Seite 19 − 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Français Page 35 − 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Contents Page
Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Conditions at the site of installation 7. . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Ambient pressure 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Special information 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Mounting instructions 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Load introduction 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Connection 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Notes on cable routing 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Connection technique 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Parallel connection of more than one transducer 10. . . . . . . . . . . . . .
4.4 Connections using the four-wire technique 10. . . . . . . . . . . . . . . . . . .
4.5 Cable extension 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6 Notes on cable routing 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Specifications 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Mechanical Data 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Options 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Dimensions (in mm; 1 mm = 0.03937 inches) 13. . . . . . . . . . . . . . . . . .
6.1 Transducer 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Mounting accessories 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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HBM A1261−2.2 en/de/fr
Safety instructions
In cases where a breakage would cause injury to persons or damage to
equipment, the user must take appropriate safety measures (such as fall
protection, overload protection, etc.). For safe and trouble-free operation, the
load cell must not only be correctly transported, stored, sited and installed 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.
Use in accordance with the regulations
U2A... type load cell is conceived 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 load cell 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 load cell is not safety element within the meaning of its use as intended.
Proper and safe operation of this load cell requires proper transportation,
correct storage, assembly and mounting and careful operation and
maintenance.
General dangers due to non-observance of the safety instructions
The U2A... 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 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 weighing technology in such a way as to minimize residual
dangers. Prevailing regulations must be complied with at all times. There must
be reference to the residual dangers connected with weighing technology.

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HBMA1261−2.2 en/de/fr
In these mounting instructions residual dangers are pointed out using the
following symbols:
Symbol: DANGER
Meaning: Highest level of danger
Warns of a directly dangerous situation in which failure to comply with safety
requirements will lead to death or serious physical injury.
Symbol: WARNING
Meaning: Possibly dangerous situation
Warns of a potentially dangerous situation in which failure to comply with
safety requirements can lead to death or serious physical injury.
Symbol: ATTENTION
Meaning: Possibly dangerous situation
Warns of a potentially dangerous situation in which failure to comply with
safety requirements could lead to damage to property, slight or moderate
physical injury.
Symbol: NOTE
Refers to the fact that important information is being given about the product
or its use.
Symbol:
Meaning: CE mark
The CE mark enables the manufacturer to guarantee that the product
complies with the requirements of the relevant EC directives (the declaration
of conformity is available at http://www.hbm.com/HBMdoc).

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HBM A1261−2.2 en/de/fr
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.
Prohibition of own 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
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 nominal capacity in the destructive range is several
times the full scale value, the relevant accident prevention regulations from
the trade associations must be taken into consideration.
Option: Explosion proof version
•Users must comply with all relevant erection regulations during installation.
•The installation conditions listed in the certificate of conformity and/or type
examination certificate must be complied with.

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1 Conditions at the site of installation
1.1 Ambient pressure
The ambient pressure for transducers may be between 0 and 5 bar. Please
note that pressure changes may shift the zero output signal.
Nominal (rated) load kg
t50 100 200 500 1 2 5 10 20
Change of zero point
[%/10 mbar] 0.065 0.032 0.016 0.006 0.003 0.006 0.003 0.002 0.001
1.2 Special information
The U2A transducers are produced entirely from non-rusting materials. The
user must test for resistance to aggressive environmental conditions in each
individual case.
2 Mounting instructions
•Handle the transducer carefully.
•The transducer seating must be horizontal, even and, together with the
transducer mounting surface, it must be absolutely clean.
•Dust, dirt and other particles are not to accumulate such that they affect the
load cell’s mobility and thus falsify the measured value. Use a cover plate to
protect the load cell from external mechanical influences.
•Do not overload the transducers (e.g. by unevenly distributed loads; if
necessary, provide overload protection (e.g. supports).
•Each transducer shoulb be shunted by a stranded copper cable (approx.
16 mm2) during or immediately after installation, in order to prevent any
welding or lightning currents flowing through the transducer.

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3 Load introduction
The transducers of the series U2A measure tension as well as compression
loads in the axial direction.
A threaded bolt on top of the housing and an internal thread on the adapter
are provided for the application of tensile loads (preferred direction).
HBM recommends the use of knuckle eyes to provide a connection free of
side force and moment. Knuckle eyes are suitable for use under quasi-static
loading (alternating load v10 Hz). When used under alternating loads, it is
essential that the transducer is installed without any axial play.
Please note the listed tightening torques for screw connecting the threaded
bolt and internal thread. Under no circumstances must these tightening
torques reach the transducer. If used without an adapter, make sure that the
bearing surface is clean and carefully machined flat and that the screw
connections are tightened properly at the base of the load cell.

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4 Connection
4.1 Notes on cable routing
Electrical and magnetic fields often cause the introduction of disturbing
voltages into the measuring circuit.
Please note the following hints:
•Use only screened, low capacitance measuring cable (cable from HBM
fullfills these requirements).
•Do not lay the measuring cable parallel to power and control lines. If this is
not possible (e.g. in cable ducts), the measuring cable can be protected,
e.g. by steel conduit.
•The stray fields of transformers, motors and contactors must be avoided.
4.2 Connection technique
Strain-gage based load cells can be connected to:
•carrier frequency
•DC-measuring amplifiers.
The transducer connection is implemented using the six-wire technique. The
connection assignment can be taken from the following illustration.
wh (white)
bk (black)
gy (grey)
Shield / filler connected with housing
gr (green)
rd (red)
−
Excitation (−)
Sense
Signal (+)
bu (blue) Sense
Signal (−)
Excitation (+)
Wiring code (6-wire−technique)
Fig. 4.1: Transducer with six-core cable

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HBM A1261−2.2 en/de/fr
4.3 Parallel connection of more than one transducer
The transducers are connected in parallel electrically by joining together the
core ends of the transducer connection cables having the same color.
ATTENTION
An overload of individual load cells cannot be detected from the output
signal.
4.4 Connections using the four-wire technique
With connections to amplifiers using the four-wire technique the cores bu
(blue) and gn (green) should be connected together, as should bk (black) and
gr (grey). Please take in account that this causes deviations to the sensitivity
and the temperature coefficient of sensitivity that this causes.
4.5 Cable extension
Extension cables must be screened and of the low capacitance type. We
recommend the use of HBM cables which fulfil these requirements. For cable
extensions, care must be taken to ensure a satisfactory connection with the
lowest possible transfer resistance and goog insulation.
When using the six-wire technique, the effects of resistance changes in the
extension cable are compensated. If you extend the cable with the four-wire
technique, the sensitivity deviation can be rectified by adjustment.
Temperature effects though are only compensated with the operation using
six-wire technique.
4.6 Notes on cable routing
The load cell connecting cable should be routed so that any condensed water
or dampness forming on the cable can drip off. It must not be led to the load
cell. In addition, it must be ensured that no dampness can penetrate the open
end of the cable.

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5 Specifications
Type U2A
Accuracy class 0.2 0.1 D1
Max. numbers of load cell verification
intervals (nLC)− − 1000
Max. capacity (Emax)kg
t50
−100, 200, 10, 20 500 1, 2, 5
Minimum load cell verification interval
(vmin)% of
Emax − − 0.0286
Sensitivity (CN)mV/V 2
Tolerance on sensitivity
with tensile loads
with compressive loads
%<"0.20
<"1.50 <"0.20 <"0.50 <"0.20 <"0.50
Temperat. effect on sensitivity (TKC)1)
in nominal temperature range
in operating temperature range %/10 K
%/10 K <"0.05
<"0.10
Temperat. effect on zero balance (TK0)
in nominal temperature range
in operating temperature range %/10 K
%/10 K <"0.05
<"0.10 <"0.04 <"0.05
Hysteresis error (dhy)1) <"0.15 <"0.05
Non-linearity (dlin)1) % v. C
N
<"0.20 <"0.10 <"0.05
Creep (dcr)over 30 min.
% v. CN
<"0.06 <"0.05
Input resistance (RLC)W340 ... 450
Output resistance (R0)W356 "0.2
Unsulation resistance (Ris)GW>5
Reference excitation voltage (Uref)V 5
Nominal range of excitation
voltage (BU)V0.5 ... 10 0.5 ... 12
Maximum supply voltage V 12 18
Nominal temperature range (BT)−10 ... + 40 [+14...+104]
Operating temperature range (Btu)°C [°F
]
−30 ... + 85 [−22...185]
(−30 ... +120) 2)[−22...+248] 2)
Storage temperature range (Btl)−50 ... + 85 [−58 ... 185]
Safe load limit (EL)130 150 150
Breaking load (Ed)
% of
300
Rel. stat. lateral load limit (Elq)
% of
Emax
25
Permissible dynamic load (Fsrel)
(peak to peak according to DIN50100)
Emax
100 160
Protection class acc. to EN 60 529
(IEC 529) IP 68 (test cond.: 100 h at 1 m water column)
IP 69 K (water at high pressure, steam jet
cleaning)
Material: Mesasuring body
Cable gland
Cable sheath
Stainless steel
Nickel plated brass, silicone
Thermoplast. elastomere
1) The data for Non-Linearity (dlin), Hysteresis error (dhy) and Temperature effect on sensitivity (TKC) are
typical values. The sum of these data meets the requirements according to OIML R60.
2)Optionally available with extended operating temperature range.

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HBM A1261−2.2 en/de/fr
5.1 Mechanical Data
Max. capacity
[ t] Nominal (rated) displacement, snom
[mm], approx.
Weight, (G) approx.
[kg] Cable lenght [m]
0.05 < 0.1 0.8 3
0.1 < 0.1 0.8 3
0.2 < 0.1 0.8 3
0.5 < 0.1 0.8 3
1< 0.1 0.8 3
2< 0.07 2.9 6
5< 0.07 4.3 6
10 < 0.09 10.7 12
20 < 0.09 15.9 12
5.2 Options
•Service temperature range extended to 120 °C [248 °F] (not possible in
connection with ATEX 95)
Explosion-proof versions according to ATEX 95:
II 2 G EEx ia IIC T4 resp. T6 (Zone 1) *)
II 2 D Ex tD A21 IP67 T80 °C (Zone 21) *)
II 3 G EEx nA II T6 (Zone 2)
II 3 D IP67 T80 °C (Zone 22 for non-conductive dust)
*) with EC-type examination certificate
Accessories, to be ordered separately:
− Knuckle eye U2A, above, U2A/.../ZGOW
− Knuckle eye U2A, below, U2A/.../ZGUW
− EEK Grounding cable

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HBMA1261−2.2 en/de/fr
6 Dimensions (in mm; 1 mm = 0.03937 inches)
6.1 Transducer
View from above
SW
SW
approx. 18.5
U2A (Max. capacities 50 kg ... 20 t)
Max. capac.
in t ØA−0,2 B C E Lmin M O SW X Y
0.05 ... 1 50 72 21 24 5*)M12 6 19 20 35
2 90 112 33 38 10.6 M20x1.5 10 30 30 50
5 100 141 40 47 13.2 M24x2 12 36 30 50
10 135 197 68 67 19 M39x2 19 60 30 50
20 155 232 82 85 24.2 M48x2 22 70 30 50
*) with U2A/1t: 7.4 mm

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HBM A1261−2.2 en/de/fr
6.2 Mounting accessories
Knuckle eye above ZGOW
Material: tempering steel, galvanized; rolled steel and PTFE/bronze fabric foil
Center of
bearing
Max.
capacity
in t
Knuckle eye
ZGOW Weight [kg] A∅B D F G H ∅K M a.f. W
0.05...1 U2A/1T/ZGOW 0.2 22 12H7 32 50 66 12 22 M12 19 16
2U2A/2T/ZGOW 0.5 33 20H7 50 77 102 18 34 M20x1.5 32 25
5U2A/5T/ZGOW 0.8 42 25H7 60 94 124 22 42 M24x2 36 31
10 U2A/10T/ZGOW 3.2 50 50+0.002
-0.014 115 151 212.5 28 65 M39x2 60 35
20 U2A/20T/ZGOW 4.8 60 60+0.003
-0.018 126 167 235 36 82 M48x2 70 44

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Knuckle eye below ZGUW
a.f.
Material: tempering steel, galvanized; rolled steel and PTFE/bronze fabric foil
Center of
bearing
Max.
capacity
in t
Knuckle eye
ZGUW Weight in kg A∅B D F G H M a.f. W X
0.05...1 U2A/1T/ZGUW 0.1 33 12H7 32 54 70 12 M12 19 16 7
2U2A/2T/ZGUW 0.2 47 20H7 50 78 103 18 M20x1,5 32 25 9
5U2A/5T/ZGUW 0.4 57 25H7 60 94 124 22 M24x2 36 31 10
10 U2A/10T/ZGUW 1.1 65.5 50+0.002
-0.014 115 148.5 210 28 M39x2 60 35 16
20 U2A/20T/ZGUW 3.2 80 60+0.003
-0.018 126 168 236 36 M48x2 70 44 18

Load cell U2A with mounted knuckle eyes ZGOW, ZGUW
16 U2A
HBM A1261−2.2 en/de/fr
Max.
capacity in
[t]
Amin Amax Fmin Fmax
0.05...0.5 139 156 171 188
1 141 156 173 188
2 212 234 262 284
5 260 288 320 348
10 418 436 541 559
20 466 489 602 625
Max.
capacity in
[t]
Min. depth for
screwing Tightening torque MA
[NVm]
B C
0.05...0.5 9.6 9.6 60 *)
1 9.6 9.6 60
2 16 16 300
5 19.2 19.2 500
10 27 31.2 2500
20 36.6 38.4 4500
*) Do not exceed this value and handle the load cell with
care during fastening to avoid damage to the thin
measuring diaphragm. Hold the lock nut in place.

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HBMA1261−2.2 en/de/fr
U2A, with ZGOW, without adaptor
Base plate
(from customer)
drawing turned by 45°
resp. 22,5°
* Recommended dimension, taking minimum thread reach into consideration
*
Max. capacity
in t D∅G H J K ∅S MA1) [NVm]
0.05...0.5 47 42 4xM5 13 84...86.4 34 5
147 42 4xM5 13 86.4 34 5
272 70 4xM10 20.5 131.6 55 35
586 78 4xM12 19 158.2 61 60
10 122 105 8xM12 16 244 79 60
20 142 125 8xM16 26 270.2 97 150
1)Recommended values for a dry thread, using a torque wrench

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HBM A1261−2.2 en/de/fr

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HBMA1261-2.2 en/de/fr
Inhalt Seite
Sicherheitshinweise 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Bedingungen am Einbauort 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Umgebungsdruck 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Spezielle Hinweise 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Montagehinweise 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Lasteinleitung 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Anschließen 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Hinweise für die Verkabelung 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Anschlusstechnik 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Parallelschaltung mehrerer Aufnehmer 26. . . . . . . . . . . . . . . . . . . . . .
4.4 Anschluss in Vierleiter-Technik 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 Kabelverlängerung 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6 Hinweise zur Verkabelung 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Technische Daten 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Mechanische Werte 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Optionen 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Abmessungen (in mm) 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Aufnehmer 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Einbauhilfen 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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HBM A1261-2.2 en/de/fr
Sicherheitshinweise
Wo bei Bruch Menschen und Sachen zu Schaden kommen können, müssen
vom Anwender entsprechende Sicherheitsmaßnahmen (z.B.
Absturzsicherungen, Überlastsicherungen usw.) getroffen werden.
Die einschlägigen Unfallverhütungsvorschriften sind unbedingt zu beachten.
Berücksichtigen Sie insbesondere die in den technischen Daten genannten
Grenzlasten.
Bestimmungsgemäßer Gebrauch
Die Wägezelle U2A... ist für wägetechnische Anwendungen konzipiert. Jeder
darüber hinausgehende Gebrauch gilt als nicht bestimmungsgemäß.
Zur Gewährleistung eines sicheren Betriebes darf die Wägezelle nur nach den
Angaben in der Montageanleitung verwendet werden. Bei der Verwendung
sind zusätzlich die für den jeweiligen Anwendungsfall erforderlichen
Rechts-und Sicherheitsvorschriften zu beachten. Sinngemäß gilt dies auch
bei Verwendung von Zubehör.
Die Wägezelle ist kein Sicherheitselement im Sinne des
bestimmungsgemäßen Gebrauchs. Der einwandfreie und sichere Betrieb der
Wägezelle setzt sachgemäßen Transport, fachgerechte Lagerung, Aufstellung
und Montage sowie sorgfältige Bedienung und Instandhaltung voraus.
Allgemeine Gefahren bei Nichtbeachten der Sicherheitshinweise
Die Wägezelle entspricht dem Stand der Technik und ist betriebssicher. Von
den Wägezellen können Restgefahren ausgehen, wenn sie von ungeschultem
Personal unsachgemäß eingesetzt und bedient werden.
Jede Person, die mit Aufstellung, Inbetriebnahme, Wartung oder Reparatur
einer Wägezelle beauftragt ist, muss die Montageanleitung und insbesondere
die sicherheitstechnischen Hinweise gelesen und verstanden haben.
Restgefahren
Der Leistungs- und Lieferumfang der Wägezelle deckt nur einen Teilbereich
der Wägetechnik ab. Sicherheitstechnische Belange der Wägetechnik sind
zusätzlich vom Anlagenplaner/Ausrüster/Betreiber so zu planen, zu
realisieren und zu verantworten, dass Restgefahren minimiert werden. Jeweils
existierende Vorschriften sind zu beachten. Auf Restgefahren im
Zusammenhang mit der Wägetechnik ist hinzuweisen.