HBM C2 Series User manual

Force transducer
C2
Mounting Instructions
Electrical
measurement
of mechanical
quantities
HBM Mess- und Systemtechnik GmbH
B 20.C2.10 e
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Content Page
Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Scope of supply 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Applicationnotes 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Structure and mode of operation 8. . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Measuring body 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Disturbance variables and their compensation 8. . . . . . . . . . . . . . . . . .
4 Conditionson site 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Ambient temperature 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Moisture 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Air pressure 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Chemical effects 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Mechanicalinstallation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Important measures for installation 10. . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 General installation guidelines 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Mounting accessories 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Electrical connection 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Instructions for cabling 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Wiring pin assignment 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Specifications 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Dimensions 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Declaration of conformity 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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4C2
Safety instructions
Use in accordance with the regulations
Force transducers of the C2 type are designed for force measurements in test
rigs/presses/test devices/testing machines. Use for any additional purpose
shall be deemed to be not in accordance with the regulations.
In the interests of safety, the transducer 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 transducer is not a safety element within the meaning of its use as
intended. Proper and safe operation of this transducer requires proper
transportation, correct storage, assembly and mounting and careful operation
and maintenance.
General dangers due to non–observance of the safety instructions
The C2 force transducer corresponds to the state of the art and is fail–safe.
The transducers 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 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 transducer covers only a small
area of force measurement technique. In addition, equipment planners,
installers and operators should plan, implement and respond to the safety
engineering considerations of force measurement technique 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
force measurement technique.
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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 signals a guarantee by the manufacturer that his product meets
the requirements of the relevant EC directives (see Declaration of conformity
at the end of this document).
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Prohibition of own conversions and modifications
The transducer 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 transducers 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.
Conditions on site
Protect the transducer from damp and weather influences such as rain, snow,
etc.
Maintenance
The C2 force transducer is maintenance free.
Accident prevention
Although the specified nominal force 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.
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C2
1 Scope of supply
•C2 force transducer
•C2 Operating Manual
Accessories (not included in the scope of supply)
•EPO3/EPO3R thrust piece mounting accessory
for 500N...10kN: Order no. 1–EPO3/200KG
20kN, 50kN: Order no. 1–EPO3R/5t
100kN, 200kN: Order no. 1–EPO3R/20t
500kN: Order no. 1–EPO3/50t
Options
•Operating temperature range extended to 120 oC
•Degree of protection IP68
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8C2
2 Application notes
Force transducers of the C2 type series are suitable for the measurement of
compressive forces. They provide extremely accurate measurements of static
and dynamic forces and must therefore be handled carefully. You must be
particularly vigilant when transporting and installing the devices. If the
transducers are dropped or jolted, permanent damage could be caused.
The limits for the permissible mechanical, thermal and electrical stresses are
stated in the Specifications. Be sure to allow for them when planning the
measuring setup, when installing and lastly, when operating.
3 Structure and mode of operation
3.1 Measuring body
The measuring element is a measuring spring made from stainless steel, to
which strain gauges (S/G) are applied. The measuring element is
simultaneously the top part of the transducer housing. The strain gauges are
arranged so that four of them are extended and the other four are upset when
a force acts on the transducer. Correction and compensation resistors are
placed in the transducer circuit in order to remove unwanted influences on the
zero signal and sensitivity.
3.2 Disturbance variables and their compensation
Torsion, bending and transverse load are disturbance variables and are
therefore to be avoided. If necessary they can be remedied with HBM
mounting accessories (section 5.3 ). In addition to this, the C2 has
independent lateral force compensation, which reduces the effects of
transverse forces to a minimum (See Specifications).
The effects of temperature on the zero signal and on the sensitivity are
compensated.
Changes in the ambient pressure act as additive/subtractive forces.
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4 Conditions on site
4.1 Ambient temperature
To achieve optimal measurement results the nominal temperature range must
be maintained. Constant but slowly changing temperatures are best.
Measurement errors caused by temperature arise if one side is heated (for
example, radiant heat) or cooled. A radiation shield and all–round heat
insulation bring about marked improvements. They must not form a force
shunt.
4.2 Moisture
Extreme humidity or a tropical climate should be avoided, if outside the
classified limit values (degree of protection IP67 under DIN EN 60529).
NOTE
Moisture must not be allowed to penetrate the free end of the
connection cable.
4.3 Air pressure
Changes in air pressure affect the force transducer in the same way as a
change in force. The ambient pressure should be 0 –5 bar. Please note that
pressure variance will displace the zero point:
Nominal load 500N 1kN 2kN 5kN 10kN 20kN 50kN 100kN 200 kN
max. zero drift
[%/10 mbar] 0.065 0.032 0.016 0.006 0.003 0.006 0.003 0.002 0.001
4.4 Chemical effects
Dust, dirt and other foreign bodies must not be allowed to accumulate such
that they divert part of the measured force onto the housing and so falsify the
measured value (force shunt).
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5 Mechanical installation
5.1 Important measures for installation
•Treat the transducer gently
•Do not overload the transducer.
•During or immediately after installation, the transducer should be bridged
by a stranded copper wire 50mm2(highly flexible signal ground cable EEK
from the HBM line). The cable is screwed on both above and below the
transducer. This prevents welding currents from flowing through the
transducer and welding the force introduction point.
WARNING
If there is a risk of breakage through overload on the
transducer and thus a risk to persons, additional safety
measures are to be taken.
5.2 General installation guidelines
The measurement direction in which forces act on the transducer must be as
precise as possible.
WARNING
Torsion and bending moments, eccentric loading and
transverse forces result in measurement errors and if limit
values are exceeded, could destroy the transducer.
HBM supplies the EPO3 thrust piece as a mounting accessory for transducers
of the C2 type series. This mounting accessory stops torsion and bending
moments and prevents transverse or oblique loads being introduced into the
transducers.
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5.3 Mounting accessories
EPO3/EPO3R thrust piece1)
EPO3
C2
U
4x at the circumference
Nominal force A B E ∅F∅G∅U∅K Weight
[kg]
500N...10kN 46 30 21 89 70 13 9 0.65
20kN , 50kN 64 48 21 89 70 25 9 0.65
100kN, 200kN 80 60 27.5 110 90 32 13 1.10
500 kN 130 90 50 147 130 44 17 2.80
1) Thrust pieces EPO3R and EPO3/200kG are made from stainless steel.
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6 Electrical connection
The 3m long transducer connection cable has colour–coded free wire ends.
The cable shielding is connected in accordance with the Greenline concept.
This means that the measurement system is surrounded by a Faraday cage.
Electromagnetic interference will not affect the measurement system.
Connectors to CE standard are to be fitted at the free end of the transducer.
The shielding is here to be laid over the whole area.
If a different connection technique is used then good EMC shielding is to be
provided in the wiring loom, the shielding again being laid over the full area
(see also HBM Greenline Information, document G36.35.0).
6.1 Instructions for cabling
•Always use shielded, low–capacity measurement cable supplied by HBM.
•Do not lay measurement cable parallel to high–voltage power lines or
control circuits. If this is not possible (e.g. in cable ducts) protect the
measurement cable, e.g. with armoured steel tube and maintain a minimum
distance of 50 cm from the other cables. High–voltage power lines and
control lines should be twisted (15 turns per metre).
•Avoid stray fields of transformers, motors and contactors.
•Do not earth transducer, amplifier and display device more than once. All
the devices in the measuring chain are to be connected to the same
earthed conductor.
•The screen of the connection cable is connected to the transducer housing.
•Connection diagram, earthing concept (Greenline)
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6.2 Wiring pin assignment
If the transducer is connected according to the following connection diagram
then when the transducer has compressive loading the output voltage at the
measuring amplifier is positive.
wh (white)
bk (black)
rd (red)
bl (blue)
gn (green)
gy (grey)
ye (yellow)
Measurement signal (+) UA
Excitation voltage (+) UB
Sense lead (–)
Sense lead (+)
Excitation voltage (–) UB
Measurement signal (–) UA
Cable shielding, connected to housing
wh
bk
rd
bl
ye
Feedback bridges in the transducer
Six–wire connection
Four–wire connection
wh (white)
bk (black)
rd (red)
bl (blue)
gn (green)
gy (grey)
ye (yellow)
The sensitivity of the transducer changes
when using four–wire techniques. The
change to the temperature coefficients of
the characteristic value (TKC) is
negligible. If the cable lengths change,
the characteristic value will also change.
The effects of temperature on the cable
are not corrected.
Fig. 6.1 C2 pin assignment; cable lengths 6m
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7 Specifications
Type C2
Nominal force Fnom kN 0.5 1 2 5 10 20 50 100 200 500
Accuracy class 0.2 0.1
Nominal sensitivity Cnom mV/V 2
Rel. sensitivity
deviation pressure dc%t"0.2
Rel. deviation from
zero dao %t1
Hysteresis
(0.2Fnom to Fnom)u % t0.2 t0.15
Linearity deviation dlin %t0.2 t0.1
Temperature effect on
the sensitivity, per
10K by reference to
sensitivity TKC% 0.1
Temperature effect on
the zero point, per
10K by reference to
sensitivity TK0% 0.05
Effect of eccentricity
per mm de%"0.3 "0.3 "0.2 "0.1 "0.2
Rel. creep over 30min dcrF+E %t"0.06
Input resistance ReΩu340
Output resistance RaΩ300...400
Isolation resistance RIs GΩu2 x 109
Reference excitation
voltage Uref V 5
Operating range of
the excitation voltage BU,G V 0.5...12
Nominal temperature
range Bt,nom °C–10 to +70
Operating
temperature range Bt,G °C–30 to +85 (120)2)
Storage temperature
range Bt,S °C–50 to +85
Reference
temperature tref °C +23
Max. operational
force (FG) % 130 150
Limit force (FL) % 130 150
Breaking force (FB) % u300
Static lateral limit
force 1) (FQ) % 50
1) by reference to a force introduction point on the load introduction point
2) 120oC version option
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C2
Specifications continued
Type C2
Nominal force Fnom kN 0.5 1 2 5 10 20 50 100 200 500
Nominal
displacement Snom mm t0.1 t0.06 t0.1
Fundamental
resonance frequency FGkHz 4.4 8.7 9.7 18.5 19.3 13 14 13 14 10.5
Weight kg 0.4 1.8 1.8 3 3 8.6
Rel. permissible
vibrational stress Frb % 100
Degree of protection to DIN EN
60529 IP67 (IP68)3)
Cable length, six–wire
connection m 3 6 12
3) IP68 version option
Additional specifications for final tolerances:
•The relative range of inversion is by reference to the final value and is
given at 50% of the nominal load:
500N: t4µm/m
1kN–500kN: t3µm/m
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16 C2
8 Dimensions
C2 (nominal forces 500N...500kN)
18.3
approx.18.5
drawing offset
by 455
Nominal force ∅A-0.2 B∅G H J R ∅SH8 T∅U X Y
500N...10kN 50 30 42 4xM5 7 60 34 7 13 20 35
20kN, 50kN 90 48 70 4xM10 12 100 55 12.5 25 30 50
100kN, 200kN 115 60 90 4xM12 16 160 68 12.5 32 30 50
500 kN 155 90 125 4xM16 20 300 97 15.5 44 30 50
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9 Declaration of conformity
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18 C2
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HOTTINGER BALDWIN MESSTECHNIK
HBM Mess- und Systemtechnik GmbH
Postfach 10 01 51, D-64201 Darmstadt
Im Tiefen See 45, D-64293 Darmstadt
Tel.: [phone]; Fax: 89 48 96; www.hbm.de
Modifications reserved.
All details describe our products in general form
only. They are not to be understood as express
warranty and do not constitute any liability what-
soever.
IM–D 07.99 –POD
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