HBMhotline Weighing Technology 2011

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_ Custom Sensors: From the customer to the successful product

_ Hygienic production with aseptic load cells

_ Precision in S form: RSCC load cell

Quality opens up new market opportunities

Weighing technology news

HBM load cells … worth their weight in gold!

reliable

innovative

precise

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HBM hotline.com 2 2011 HBM hotline.com 2 2011

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In this issue

Editorial management HBM Marketing Communication

Editorial responsibility www.makomti.de

Design & artwork www.contrust-design.de

Publisher HBM Test and Measurement

Im Tiefen See 45

D-64293 Darmstadt, Germany

Email: [email protected]

www.hbm.com

Dear reader,

One of the main industrial trends of our time is the

efficient use of materials. Countless developers are

working around the world to continuously opti-

mize technologies and production methods to use

precisely the right quantity of materials without

expensive excess.

Editorial

Imprint

Weighing technology trends

Hygienic production with aseptic load cells 10

Weighing technology in Asia: Speed and quality are trumps 12

OEM manufacturers of medical devices decide to use HBM strain gauge sensors 16

Preventive maintenance helps reduce downtime and increases productivity 18

New products

IP69K and IP66K: Fit for the food industry 5

Welcome to the USA: VCAP-certified weighing technology 5

RSCC load cell: Precision in S form 14

An addition to the HLCB family: High-performance HLCB/PCX loading foot 14

AED9101C: Safe weighing with gas and dust 15

C16 load cell: 250,000 units in global use and still going strong 15

Customer solutions

From soup to soap powders: HBM load cells in multi-function fillers 4

Four weeks without recharging: Mobile wireless scales demonstrate endurance 6

Center of gravity determination in mining machinery modules 7

Custom sensors: From the customer idea to the successful product 8

Gerhard Kadijk, Head of Product Management Weighing Technology and OEM Sensors

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Accuracy of strain gauge-based load cells

Simple building materials scales for sand, cement, water

Process optimizationMachine manufacturers

Filling and packaging systems

Building materials scales for additives High-precision

checkweighers

Scales based on new concepts

Legal-for-trade shop-counter scales

C1D1 C2 C3 C3MR C6

High accuracy

Target accuracy

Load cells using the principle of electromagnetic force compensation

Low accuracy

Use of HBM load cells according to their accuracy grade

25 YEARS

I S O 9 0 0 1

33


Precision is more important than ever. Companies that can offer ex-

tremely precise weighing and dosing systems give their customers

an edge. Customers need to be willing to invest more for the added

value this provides over standard products.

Quality is worth its weight in gold – and is a safe investment. HBM

supports customers by exceeding their needs for quality, added

value and efficiency. This is done by providing load cells and elec-

tronics made with the best components and available at sensible

market prices.

Accuracy is trumps for C6 in new marketsA good example for our pursuit of greater precision is with the high-

accuracy class C6 load cells. HBM invests significant sums in order

to continuously guarantee load cells of this quality from our series

production. The same applies to the use of load cells between -10°C

and +40°C, i.e. utilizing the temperature range defined for load cells

in the OIML R60 guideline.

This continuous improvement in the accuracy of load cells based

on strain gauge technology enables new highly precise applications

whose requirements could previously only be met by significantly

more expensive sensors based on the principle of electromagnetic

force compensation. Customers can take advantage of reasonable

prices for this technology to develop new innovative applications.

From initial pioneering to achieving a worldwide standardThis year an anniversary that we are enthusiastically

celebrating underlines HBM’s long commitment to

high quality weighing technology: 25 years ago on

the 23rd August 1986, HBM was awarded certifi-

cation based on the ISO 9001 quality management

guideline – as the first company in Germany. What

was then viewed as a pioneering achievement is today stan-

dard around the world.

Quality is worth its weight in gold – as much today as 25 years ago.

By joining the C6 – or higher – club and working together with HBM,

we can set future weighing technology standards.

Yours

Gerhard Kadijk

Editorial

4


Customer solutions HBM load cells in multi-function fillers

The British company All-Fill International

builds individual filling machines and turn-

key plants for OEM customers in the food,

pharmaceutical and chemical industries.

Precise filling systems are built based on

the gravimetric process. During the filling

process, the filling quantity is determined

via the weight. This process can be acceler-

ated by combining rapid initial filling with

a slower final fine dosing. Both the achiev-

able speed and the accuracy depend on the

reaction and settling time of the load cells

used and the processing time in the mea-

surement electronics.

Reliable and flexible: PW12CAll-Fill has been using analog and digital

load cells, such as the FIT family from HBM,

for many years now. The choice for their

new sack filling machine fell on the PW12C

load cell with a maximum capacity of 75 kg.

The system chosen for the digitalization of

the measurement

data was the

AD103 digital

measurement

electronics, which

is tailored specifically

for weighing technology

applications.

"We wanted a reliable load cell with

sufficient flexibility for the required

accuracy and stability to carry the

weighing platform”, said Simon Goulden,

development manager at All-Fill Interna-

tional, explaining his decision.

With the 6-wire circuit, the PW12C load cell

cable length can be adapted to the actual

situation without affecting the accuracy.

In addition, the PW12C is made of alumi-

num, OIML R60-approved and designed for

a maximum platform size of 800 x 800 mm.

Bernd Knöll, HBM

more … www.hbmhotline.com

Whether powder, granulate, pastes or creams – the worm-type conveyor-based machines at All-Fill International reliably fill the various product types rapidly and precisely. The speed and accuracy depends on the load cells used.

From soup to soap powders: Exact weighing, precise filling

PW12C

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RTN and C2A load cells with improved degree of protection New products

HBM smoothes the export route to the USA for scale manufacturers New products

IP69K and IP66K: Fit for the food industry

Export of load cells to the USA now requires certification to VCAP**

according to the latest directives. And HBM weighing technology

meets these demanding requirements.

Weighing technology components must conform to the NIST

Handbook 44 (National Institute for Standards and Technology) if

intended for use in the USA. This conformity is confirmed by the

NTEP* certification. Certification is essential for the subsequent

approval of the scales on site. In addition, the production systems

of the manufacturer will be checked and certified to VCAP as of

now.

The audit is carried out by an external body, who evaluates the

quality assurance systems and production systems in particular

within the company.

Reiner Schrod, HBM more … www.hbmhotline.com

RTN and C2A load cells from HBM have long been successfully

used in industry. However, the load cells have an IP68 degree of

protection that is no longer adequate for the food industry. The

load cells need to withstand intensive high pressure and steam jet

cleaning processes at increased temperatures and also be insensi-

tive to chemically highly-active disinfectant agents.

Because of this, HBM has now improved the sealing design on its

RTN and C2A load cells. These are now optionally available with

IP69K and IP66K degrees of protection. The upgraded perfor-

mance has been confirmed by a test report from the independent

VDE Certification Institute.

Rudolf Almendinger, HBM more … www.hbmhotline.com

* National Type Evaluation Program ** Verified Conformity Assessment Program

Welcome to the USA: VCAP-certified weighing technology

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DIS 2116weighing electronics

Wireless connection

On-board wiring system Wireless scales

AD104C amplifier

Rechargeable battery

Load cells

6


Customer solutions HBM weighing technology with energy-saving firmware

Four weeks without recharging: Mobile wireless scales demonstrate endurance

Mobile wireless scales are used in loading processes with loading

cranes or skip loaders. The mechanical scales are totally self-con-

tained without connection to the on-board supply network. The

measured data is transmitted wirelessly. S+P GmbH is the specialist

for mobile, verified scales. The company has been supplying scales

for over 20 years now for use on industrial vehicles, e.g. silo-placing

units, tank trailers, skip loaders or cranes. Such mobile scales enable

demand-driven loading and unloading of vehicles and optimal utili-

zation of the fleet, reducing operating costs.

Wireless and easy to retrofitFleet operators receive verified, grade III mobile wireless scales from

S+P, scales that can be easily and rapidly installed on the vehicles.

The customer can install the wireless scales themselves within two to

three hours, reducing the downtime of the vehicle to a minimum. As

the scale has already been verified prior to delivery, it is immediately

ready for operation once it has been installed. In addition, the sys-

tem can be detached at any time and installed on a different vehicle.

S+P has introduced two new compact and service-friendly wire-

less scale systems to the market with the SPF1990DS model for skip

loaders and the SPF2009K model for loading cranes. They are robust

and legal for trade as well as being also easy to install and can be

retrofitted in just three steps. Both wireless scale systems impress

with their manipulation safety, user-friendliness and the possibility

of weighing and billing on site.

Manipulation-safe, verified scales from HBM The requirements for scales in goods weighing are high. They must

not only be verified, they must also have a manipulation-safe con-

struction and provide seamless documentation. HBM has both the

technology and the products to build verified, manipulation-safe

wireless scales with encrypted data transmission – entirely in com-

pliance with the EU MID directive requirements (WELMEC 7.2). In

addition, the HBM firmware includes a special power management

system for energy saving, enabling longer battery operating times,

an advantage that profits S+P. Approval for PTB scale class III is also

available.


The new mobile wireless scale from S+P Wägetechnik GmbH remains operational for four weeks – without recharging. This compares with previous average usage times of several days because of the limits of the batteries. This success is due to the innovative ideas and clever design of S+P, combined with the know-how and experience of HBM.

DIS 2116weighing electronics

Wireless connection

On-board wiring system Wireless scales

AD104C amplifier

Rechargeable battery

Load cells

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Customer solutions HBM weighing technology with energy-saving firmware

Four weeks without recharging: Mobile wireless scales demonstrate endurance

HBM’s C6A force transducer on the jacking position of a bucket wheel excavator.

Wireless scales from S+P, mounted on the telescopic arms of a skip loader.

Mechanical scales from S+P with integrated HBM weighing technology. To simplify the assembly and maintenance of mining machin-

ery, the Serbian company Kolubara Metal decided to determine

the weight and the center of gravity of the modules by weigh-

ing them.

The weighing of mining machines is required after assembly or

conversions at regular intervals in order to evaluate the stabil-

ity and prevent accidents. Entire modules are lifted off their

ball-bearing mounted chassis using hydraulic jacks and the

loads of the individual jacks are determined.

Kolubara Metal installed the C6A HBM force transducers on the

jacking positions. The HBM data acquisition system MGCplus

was used to aquire the measured data. catman®AP measure-

ment software was used to configure, visualize and analyse the

data.


Center of gravity determination in mining machinery modules

Customer solutions

Legal for trade scales - with weighing technology from HBM

Up to 24 load cells can be connected to the DIS 2116

digital weighing electronics. The measured data are

digitalized by the integrated AD104C amplifier. The

firmware contains all components for safe, encrypted

wireless operation.

8


The beginning is always marked by the customers’ ideas. HBM

contributes to the economic success of customer-specific sensors

through their production quality and measurement technology

know-how. Rapid prototyping and transfer to stable mass produc-

tion ensures reproducible, stable and inexpensive sensors.

HBM as an extended workbenchNumerous customers develop their own transducers for their

applications with the help of strain gauges (SG). At first glance,

measuring with SG is relatively simple. It all comes down to accuracy

and quality. A special production process must also be developed

on the customer side for the application of the SG. It may make

economic sense, with larger quantities, to transfer SG application to

HBM. This saves costs and guarantees a high uniform sensor quality

as SG application is one of the core competences at HBM.

Complete solution instead of single componentsThe SG principle of measurement offers room for innovative ideas.

Whether in emergency care, medication dispensing or patient moni-

toring – all transducers can, with the help of SG, determine physi-

cal parameters such as force or weight reliably and precisely. HBM

sensors are also used in the offshore industry or in the production

From the extended workbench through modifications on standard products to the complete engineering – HBM offers customer-specific sensors for force, weight, torque and strain. Projects ranging from individual items to large-scale series are implemented.

Custom sensors: Making the customers’ ideas into succ essful products

"Custom sensors always

means team work. A

continuous dialog

between the customer

and HBM is a prerequisite

for a joint value creation

process."

Customer solutions Customer-specific sensors offer unlimited application options

Arnt-Henning Andersson, Leader of Engineering, HBM Norge AS

of special vehicles and industrial machinery. Complete measurement

technology solutions are particularly in demand.

What should the product look like? How should it function? The

customer delivers the basic idea. HBM takes over engineering and

production, clarifying which SG, materials or transducer geometries

are optimally suited to the application. The next step is production

with the SG being applied and connected before the end product is

finally tested.

9


Modified standard products The comprehensive HBM standard product range often serves as the

basis for the development of customer-specific sensors. Modified

sensors often include customer or branch-specific plugs, cables and

material certificates. They are perfectly adapted to the end product

or the application – an economic advantage that pays for itself in

large order volumes.

Custom sensors – a worldwide serviceThe time from prototype to market maturity is reduced with HBM

engineering teams. The exchange of specialist knowledge is achieved

because the customer’s engineers are in direct contact with the HBM

engineers. HBM strives to remain close to engineering teams in the

USA, Europe and Asia so that the common aim of achieving an eco-

nomic result profits all customers worldwide.

Sven Schotte, HBM more …www.hbmhotline.com

Custom sensors: Making the customers’ ideas into succ essful products

Application examples for customer-specific sensors

_ Monitoring uniform material feed

_ Sensors in automated processes of production quality

control

_ Control, monitoring and logging of forces in actuators

and robots

_ Joystick applications in manipulators

_ Medical engineering equipment in orthopedics

_ Force monitoring for heart massages

_ Automated medication dispensing

Custom sensors from HBM Customer-specific sensors for force, weight,

torque and strain

What can we do for you?

_ Modification or new development

_ One-off project or series production

_ Production outsourcing

Contact our engineering teams in

Europe, USA or Asia: [email protected]

Randy Hopkins, Sensor Business Director, HBM, Inc., U.S.A.

Peter Wu, Business Development Manager, HBM (Suzhou) Ltd., P.R. China"Economic efficiency plays

a great role for both sides

in the development of

customer-specific sensors.

So we work with the

customer towards the

same objective."

"All sales employees are

familiar with custom

sensors here in China.

You must know the

market conditions

precisely in order to

correctly anticipate

customer requirements."

Customer solutions Customer-specific sensors offer unlimited application options

10


Weighing technology trends Hygienic production with aseptic load cells

Consumers like their fruit juices and smoothies freshly prepared

without preservatives but it is precisely these foods that are particu-

larly susceptible to bacteria and microorganisms. Careful cleaning of

the plants removes deposits that would otherwise be ideal feeding

grounds for microorganisms and sources of cross-contamination.

Strict hygiene during production and filling is therefore obligatory.

It all comes down to designThe trend in the food and pharmaceutical industries is towards au-

tomated cleaning processes. It must be possible to clean plant ele-

ments and components easily and thoroughly while installed, mak-

ing hygienic design essential. Corners, edges, niches and gaps are

ideal spots for deposits.

For this reason, hygienic designs are based on round, smooth surfac-

es and flow-favorable geometries. But the material also influences

hygiene. Corrosion and contamination must not be given a chance

which translates into electro-polished, hardened stainless steel and

clean laser-welded seams.

Clean foods and medicines are essential when health is in question. Production is becoming increasingly automated; a trend that is also the case for plant cleaning. It becomes increasingly important for the design of the plant’s equipment to meet hygiene requirements. The EHEDG* certificate confirms compliance with hygienic design specifications. Appropriately certified components can be used in the food and pharmaceutical industries and enable plant engineers to meet the EU machine directive for hygiene.

No chance for bacteria or dirt

* = European Hygienic Engineering & Design Group

Conventional load cells …

… have corners, edges and gaps that are difficult to clean, even when they are made of stainless steel. A disadvantage when it comes to hygiene.

HBM’s aseptic PW27 and PW25 load cells are optimally suited to the high hygiene requirements in the food and pharmaceutical industries.

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Weighing technology trends Hygienic production with aseptic load cells

Load cells for aseptic productionModern weighing technology can be easily included in aseptic or hygienic production processes with the aseptic PW25 and PW27 load cells. Shorter cleaning times and reduced downtime increases production efficiency.

Hygienic design certified to EHEDG*

The first load cell in the world with an EHEDG

certificate was successfully installed in multihead

combination weighers in the food industry. Thanks

to a design without edges or gaps, it can be cleaned

without problems. Even the load cell cable, doped

with silver nano-particles and therefore effectively

anti-bacterial, offers extensive hygienic safety. The

integrated overload protection is protected against

dirt and makes the PW27 almost indestructible. In

addition, the hermetically sealed load cell has IP68/

IP69 degree of protection.

A clean business

Easy to clean – the same applies to the PW25 load

cell. Just like the PW27, the PW25 also has a design

without edges or gaps. Similar in design, but with-

out the EHEDG certificate, the PW25 is a guaran-

tee for clean weighing. The load cell is insensitive

to extremely humid and aggressive ambient

conditions. In addition, dimensions are compat-

ible to the PW15 Footprint industry standard so

that existing plants can be upgraded without any

difficulty.

PW25PW27

PW27

_ EHEDG-certified

_ Designed to hygienic aspects

_ Aseptic design for top safety

_ Integrated, encapsulated overload stop

_ Suitable for humid, aggressive environments

_ Stainless steel housing with IP68/IP69K protection

_ Maximum capacity 10 kg and 20 kg

_ Easy to clean

PW25

_ Integrated, encapsulated overload stop

_ Installation-compatible to industry standard

SP-4 load cell

_ Stainless steel housing with IP68/IP69K

protection

_ Maximum capacity 10 kg and 20 kg

_ Easy to clean

Bernd Knöll, HBM more … www.hbmhotline.com

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Asia is booming everywhere, even in the weighing technology market. Not every company has been able to profit from this dynamic market development, only those who can adapt to local requirements can penetrate the hard Asian competitive environment and may succeed. And there are other success factors: Speed, innovation and quality. HBM has long been successful in the Asian markets with its own production sites and sales offices.

Weighing technology in Asia: Speed and quality are trumps

These figures impress: HBM achieves double-figure growth every

year for its weighing technology business in Asia. Even in the crisis

year of 2009, while all other markets saw minus figures, China still

recorded some growth which then accelerated at record speeds at

the end of the crisis. No doubt about it: Asia, and above all China, is

also the number one growth engine in the world of weighing tech-

nology.

HBM has been present in the Asian market since the 1980s – and has

had its own factory in Suzhou, 100 km west of Shanghai, since 1997.

This factory supplies the whole world with high quality and cost-

effective load cells, and has also developed into the nucleus for the

sales success of the company in China and Asia.

Chinese toll station with HBM weighing technologyHBM load cells are very popular in the "classic applications" of

weighing machine construction. The RTN ring-torsion load cell is,

for example, used in the truck scales at the large toll stations on the

Chinese motorways. And ever more new branches are using HBM

load cells, such as the food industry: Oils, beverages, milk, shampoo,

soya and oyster sauces are examples of liquids that can be precisely

and reliably dispensed for Asian consumers thanks to HBM weighing

technology.

HBM products are also used worldwide in medical engineering

equipment. In Taiwan, the SP4 single-point load cell is integrated

in hospital beds to inform the medical personnel at all times about

the weight of the patient. The PW6C load cell is used in the medical

laboratory of Singapore to measure foreign constituents in human

blood. And the PW10A load cell is used in the baby scales of numer-

ous hospitals.


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Weighing technology in Asia: Speed and quality are trumps

Quality and precision: In Asia, HBM also plays their "best in class" strategy.

Innovations are accepted more rapidly in AsiaWhere does this great success of HBM load cells originate within the

Asian market? It is due to the consistent commitment to innovation

and quality, as Timo Ren, international product manager at HBM

China, explains: "The Asian market reacts much faster to innovations

and new trends than other regions of the world." Ren also explains

that only companies that deliver quality and highly sophisticated

products can survive in the market.

There are numerous examples. Scale manufacturers in Asia are

already using the modern load cells with the high accuracy class

C6, which permit the development of numerous novel weighing

technology applications. Digitalization is also widely advanced here:

Half of all digital C16i type load cells produced by HBM are sold in

Asia. And the novel aseptic PW27 load cell, which sets the highest

of hygienic standards, has already met with broad acceptance by

Asian customers.

In addition to the globally marketed standard products, the engi-

neers at HBM China have also developed some special products for

the Asian market – for example, the SP5 load cell for multi-head

combination weighers and the S-shaped S40A load cell which is

mainly used in cement mixing plants.

Best in Class: No compromises in qualityHBM has focused on absolute quality of its products for decades

now. Numerous competitors in the extremely competitive Asian

markets instead attempt to offer less expensive prices with corre-

sponding losses in accuracy, durability and processing. A strategy

that is out of the question for HBM. Weighing technology produc-

tion in China or Germany – the quality guidelines at HBM are identi-

cal. Customers can therefore rely on top quality worldwide.

Timo Ren, HBM China more … www.hbmhotline.com

Weighing technology trends“ We consistently rely on our

"best-in-class" strategy.

Regardless of where the load

cell is produced, Germany

or China: Our customers can

rely on the product quality

remaining equally high

and meeting globally valid

standards 100 % – and at

absolutely market-appropriate

prices. ” Timo Ren, Product Manager, HBM China

14


The S-shaped RSCC load cell combines the advantages of its

predecessor models RSCA and RSCB whilst remaining compat-

ible. All available maximum capacity models from 50 kg to 5 t

are made of stainless steel and are hermetically encapsulated.

RSCC is available with accuracy class C3 and achieves degree of

protection IP68.

The RSCC load cell, which is specifically designed for tensile

loading, is often used in tank weighing with suspended silos or in

belt weighers. Robust, insensitive and with an optional adapter

for cable protection systems, it is ideal for use in concrete works.

Typical application areas are fill level monitoring, deduction

weighing and dosing processes. Applications in the chemical

industry or mills are also possible with the optionally available

versions for ATEX Zone 1/21 or 2/22.


The high-performance HLCB/PCX loading foot is suitable for

type HLCB load cells in the maximum capacity range from 220 kg

to 1.76 t, and for BLCB and ELCB load cells. Lateral forces are

reduced and high accuracy is achieved with the patented double

pendulum system.

The loading foot is height-adjustable and adapts flexibly to cus-

tomer-specific constructions. Different construction heights or

floor unevenness can thus be compensated for. The rubber foot

also ensures a solid stand. The loading foot, made of stainless

steel, is also interesting for applications with standard accuracies

as a cost-effective set of four.

Scales with 6,000 divisions can be made legal for trade with

HLCB/PCX and the HLCB1C6 load cells, together with a suffi-

ciently rigid scale construction.


An addition to the HLCB family

Precision in S form

New products RSCC load cell: Precise and cost-effective

New products New high-performance HLCB/PCX loading foot

S-shaped RSCC load cell

_ Accuracy class C3 and OIML R60 test certificate

_ Maximum capacity: 50 kg / 100 kg / 200 kg / 500 kg / 1 t / 2 t / 5 t

_ IP68 (severe test conditions 1 m water column / 100 hours)

_ Hermetically encapsulated stainless steel housing

_ Optional adapter with M12 x 1.5 thread for cable protection

systems

_ Optional explosion protection per ATEX

_ Available with various cable lengths up to 20 meters for

long routes without junction boxes

High-performance HLCB/PCX loading foot: Height-adjustable, stable and precise

15


Gases are often highly explosive. Even harmless substances can

give rise to potentially explosive mixtures as dust. The AED9101C

weighing electronics from HBM is explosion proof and therefore

optimally suited for use with gas and dust.

AED9101C opens up new market opportunities to the user for

individual automatic and non-automatic scales in the ATEX

Zones 2 (gas) and 22 (dust). The continuous further development

and consistent upwards compatibility of the AED concept en-

sures maximum investment security. The scope of supply also

includes AED_Panel32 software. This allows all parameters for

measurement to be set without difficulty and to individually op-

timize scales. AED9101C is suitable for legal for trade scales up

to 10,000 divisions in scale class 3.


The C16 began life with an annual production of just 500 pieces

and has since developed into a 250,000 unit success story. Veri-

fied scales are now established worldwide with the latest self-

centering C16 load cell.

The third C16 generation impresses with reliability and high

accuracy – even under unfavorable ambient conditions. The

load cell is available in numerous variants to match any special

requirements on site.

In addition, HBM offers a comprehensive range of accessories

and installation modules, together with an almost identical digi-

tal version of the successful C16 load cell.


250,000 units in global use and still going strong

Safe weighing with gas and dust

AED9101C weighing electronics for ATEX Zone 2 and 22 New products

C16 load cell on the route to success New products

C16 load cell

_ Maximum capacity: 20 t / 30 t / 40 t / 60 t / 100 t / 200 t

_ Approvals: OIML, NTEP, ATEX, GOS

_ EMC-tested

_ Made of stainless steel

_ Degree of protection: IP68/IP69K

_ Option: Integrated overvoltage protection

Zone 2 (gas)

Zone 22 (dust)

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Analogdisplay

OutputStraingauge

Matching circuit

Gain

Auxiliary energy

Digitaldisplay

Recorder

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16

OEM manufacturers of medical devices decide to use HBM strain gauge sensors

In order to really comprehend the advan-

tages of strain gauge technology, it is im-

portant to understand the structure and

working methods of strain gauges (SG)

beforehand.

Strain gauges are essentially made of wires

laid out in a meandering course in the

smallest of spaces and glued to a measuring

body. If this measuring body is deformed,

the wire diameter changes and so does

the electric resistance. With the help of a

special electric circuit (Wheatstone bridge

circuit), very small changes in resistance

caused by minimal mechanical deformation

in the micrometer range can be metrologi-

cally recorded.

The integration of SG technology in the

construction of medical devices can be

extremely complex and is often subject to

strict industry standards or official regula-

tions. Following a precise application analy-

sis and evaluation of the legal regulations,

HBM offers either an SG type best suited to

the product or the provision of a complete

sensor element.

A component can be designed, with the help

of the Finite Element Method (FEM) and oth-

er calculation methods, so that maximum

deformations are induced under load ap-

plication at specific points and these points

represent the most suitable positions for the

application of an SG.

An initial prototype can then be created on

this basis. It is calibrated and prepared for

exact and reproducible measurement, then

tested in the laboratory. The OEM manufac-

turer can then decide to produce the sensors

themselves on the basis of the prototype or

not. As the sensors made by HBM are tested

to the same standards as the prototype, the

quality level remains intact in all cases.

High quality, precision, reliability, punctual

delivery and low manufacturing costs –

OEM manufacturers who trust in HBM and

therefore over 60 years of measurement

technology experience benefit all the way.

SG use has been proved in numerous medi-

cal applications. Here a number of examples:

OEM manufacturers of medical devices integrate strain gauges or sensors based on strain gauge technology in their products to improve accuracy and durability. From robot-support surgery to monitoring the flow rate of insulin pumps – this proven technology enhances diagnostic capability, reduces costs and improves the quality of patient care.

Multi-axes SG sensor arrangements increase measurement accuracy during robot-supported surgical interventions.

Typical design of a Wheatstone bridge circuit

17



Patient lifter systemsMotor-supported lifting systems are a com-

monly used means to lift patients out of

their beds into wheelchairs or stretchers.

A system specially developed for a leading

OEM in the medical sector allows the move-

ment speed to be more precisely controlled

through an SG force transducer in the con-

trol handgrip, so that the speed and the

smoothness of the lifting movements can

be influenced.

Robot-supported surgeryA surgeon can implement surgical interven-

tions by remote control today with the same

level of precision as a direct surgical inter-

vention.

One HBM customer requirement was to

precisely measure the torque and depth of

a drill point for an orthopedic hip opera-

tion. It was necessary to control the depth

of the drill hole in the bone in all three

position axes and to achieve a reproduc-

ible accuracy in the micrometer range for

positioning. The forces and movements in

the upward and downward directions were

recorded with customer-specific, multi-axes

SG sensor arrangements for compressive

and tensile measurements. Another SG sen-

sor was mounted in a vertical arrangement

to measure the full deflection and the con-

sistency of the drill movement. It ensured

the correct positioning of the patient

on the operation table. Thanks to this

innovative technology, it was possible to

introduce a new, highly accurate device to

the market for robot-controlled surgical

interventions.

Infusion and insulin pumpsCompact insulin pumps worn on the body

must deliver the appropriate dosage of

insulin according to the feedback from an

integrated blood glucose monitoring system,

but still enable the patient to intervene as

necessary. A customer-specific SG sensor

arrangement by HBM improved the control

of the pump and its efficiency.

Infusion pumps also require uniform delivery

of medication without coming into contact

with or contaminating the liquid. A custom-

er-specific SG sensor arrangement by HBM

enabled precise measurement of liquid de-

livery. At the same time, the SG technology

used prevents flow rate disturbances caused

by tangled tubing or blocked veins, ensuring

a cost-effective monitoring of the flow rate

of critical fluids.

www.hbm.com/medicine

Robert Chevalier, Director of Sensor Sales, Americas – HBM, Inc.

Two and three-axes SG force transducers from HBM improve the resolution of mammography devices and increase comfort for the patient.

A customer-specific SG sensor arrangement makes insulin pumps more reliable.

A specially developed SG force transducer arrangement in the control grip of a patient lifter helps to control the movement speed more precisely.

A precise table position during computer tomography is possible using a multi-axes SG arrangement by HBM.

Reduced and shorter downtime, no costly repairs

Repair of scales including additional cost

Failure of scales

18


Weighing technology trends A reliable reporter: DIS 2116 digital weighing system

The primary aim of MRO (maintenance, repair and overhaul) con-

cepts is to prevent system failures and therefore ensure a high tech-

nical availability of the system. According to DIN 31051:2003-06,

MRO is defined as a combination of maintenance, inspection, ser-

vicing and improvement.

_ Maintenance delays the wearing out of a system.

_ During an inspection, the system status is determined and

evaluated in order to initiate necessary consequences.

_ Servicing returns the system to a functional state.

_ Improvements increase functional safety without changing

the function itself.

An industrial trend is towards technically complex yet light, compact scales. While a safety reserve used to be included through over-dimensioning, it is the construction that is optimized today. A smaller safety reserve and more complex technology however increases the susceptibility of the scale system. It takes longer to find and rectify any errors. Preventative maintenance can detect and rectify any weak points of the scale system early on. The prerequisite for this is continual checking of the status data, e.g. with the assistance of the DIS 2116 digital weighing system, which provides reliable reports.

Preventive maintenance helps reduce downtime and increases productivity

Reduced downtime; higher operating safetyFrom an economic aspect, preventative maintenance pays for itself.

Problem-free production processes with less malfunctions increase

productivity. The optimal utilization of device service life and their

scheduled replacement simplifies spare parts logistics and costs can

be calculated. The greater operating safety is also a positive factor. If

a scale fails, the business not only incurs those costs that arise from

eventual repair work. The entire flow of operation can be disturbed

if, for instance, gravimetric-based filling plants come to a standstill

or vehicles cannot be loaded/unloaded.

Preventative maintenance with DIS 2116

Conventional maintenance

Reduced and shorter downtime, no costly repairs

Repair of scales including additional cost

Failure of scales

19


Weighing technology trends A reliable reporter: DIS 2116 digital weighing system

Preventive maintenance helps reduce downtime and increases productivity

Digital measurement chain for maximum transparencyMaintenance schedules are determined as part of the preventative

maintenance framework that require the analysis of reliable status

data.

Digital measurement chains deliver safe process information, over

and above the basic measurement result. In combination with the

C16i load cell, the DIS 2116 digital weighing system from HBM works

as a purely digital measurement chain. This allows vehicle scales to

be set up with up to 24 load cells. All connections between the load

cell and the DIS 2116 are set up with the VKD2R-8 digital terminal

box.

One advantage of the digital measurement chain, in addition to its

high signal quality and EMC immunity, is the simple integration into

a higher order control system. The DIS 2116 digital weighing system

forwards information from the scale system to the control system.

This allows for example for more rapid identification of failed sen-

sors. This means that maintenance intervals can be planned based on

these status messages. The result is rapid repair and fewer standstill

times.

Even the installation of the DIS 2116 is simple. It can be integrated

in the higher order system level with just a few software commands.

The scale electronics are connected via RS-232 or with the flexible

Anybus port via Ethernet or another bus system.


The HBM digital measurement chain delivers safe process information:· C16i load cell· VKD2R-8 terminal box· DIS 2116 digital weighing system

New PTB type approval for automatic and non-automatic scales

S335

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7-

1002

.335

2

HBM Test and Measurement

www.hbm.com Email: [email protected]

Tel. +49 6151 803-0 Fax +49 6151 803-9100

measure and predict with confidence

HBM’s latest explosion-proof AED9101C weighing electronics

is optimally suited for use where gas and dust are present.

This gives greater flexibility for users conforming to ATEX

Zones 2 (gas) and 22 (dust) requirements.

Legal for trade scale systems can easily be developed as per MID

and 2009/23/EG using the DWS2103 digital scale display. PTB has

accepted several type approvals for automatic and non-automatic

scales. Scale systems are optimally protected against manipulation

because the DWS2103 transmits data encrypted.

The ATEX markings explained interactively:

www.hbm.com/atex

Get to know the DWS2103: www.hbm.com/dws2103

Explosion-proof weighing technologyAED weighing electronics for ATEX Zone 2 and 22

Legal for trade scale systems with DWS2103Digital scale display protects against manipulation

New at HBM.com

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HBMhotline Weighing Technology 2011