SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Practical experiencesPractical experiences

with OIML R60with OIML R60

Sascha Mäuselein

Oliver Mack

2 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Table of contents

• Excitation voltage

• Force introduction

• Material

• Types

• Embodiment

• Eccentricity

• Stability of temperature

• Air flow

• Settling- and Drying-effects

3 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Table of contents

• Excitation voltage

• Force introduction

• Material

• Types

• Embodiment

• Eccentricity

• Stability of temperature

• Air flow

• Settling- and Drying-effects

4 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Excitation voltage – creep

Creep, DR and error limit of a C3-LC (300g)at 40°C as function of time

Excitation voltage5 V

Z = 5000

Excitation voltage10 V

Z < 3000

5 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Excitation voltage – load cell errors

Load cell errors of a 600 kg LC (C5)

Excitation voltage5 V

Excitation voltage10 V

6 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Table of contents

• Excitation voltage

• Force introduction

• Material

• Types

• Embodiment

• Eccentricity

• Stability of temperature

• Air flow

• Settling- and Drying-effects

7 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Force introduction – material

Influence of temperature on MDLO in v for a C3 LC and mpe for Y = 20000 as function of ambient temperature

Force introduction made ofstainless steel

Y = 20000

Force introduction made ofaluminium

Y = 4500

8 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Table of contents

• Excitation voltage

• Force introduction

• Material

• Types

• Embodiment

• Eccentricity

• Stability of temperature

• Air flow

• Settling- and Drying-effects

9 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Load cell errors of a 8kg single point LC (C3)

Force introduction viaplatform

n = 1500

Force introduction viasuspension gear

n = 3000

Force introduction – types

10 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Table of contents

• Excitation voltage

• Force introduction

• Material

• Types

• Embodiment

• Eccentricity

• Stability of temperature

• Air flow

• Settling- and Drying-effects

11 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Load cell errors of a LC for different punctual force introductions

Force introduction – embodiment

12 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Table of contents

• Excitation voltage

• Force introduction

• Material

• Types

• Embodiment

• Eccentricity

• Stability of temperature

• Air flow

• Settling- and Drying-effects

13 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Eccentricity

Mpe for class C3 and load cell errors in units of vas function of load for a 8 kg LC

14 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Table of contents

• Excitation voltage

• Force introduction

• Material

• Types

• Embodiment

• Eccentricity

• Stability of temperature

• Air flow

• Settling- and Drying-effects

15 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Stability of temperature

Zero signal of a single point LC (C3, 140kg) in units of vas function of time at 40°C and 85%rH

Variation of zero signal of 4 vat a variation of temperature of 2°C

16 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Table of contents

• Excitation voltage

• Force introduction

• Material

• Types

• Embodiment

• Eccentricity

• Stability of temperature

• Air flow

• Settling- and Drying-effects

17 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Air flow

Variation of zero signal of 0,5 v

Zero signal of a single point LC (C3, 140kg) in units of vas function of time at 41°C and 85%rH

18 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Variation of zero signal of 0,02 v

Reduction by a factor of 25

Reduction ofair flow by a tent

Zero signal of a single point LC (C3, 140kg) in units of vas function of time at 41°C and 85%rH; LC in tent

Air flow

19 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Table of contents

• Excitation voltage

• Force introduction

• Material

• Types

• Embodiment

• Eccentricity

• Stability of temperature

• Air flow

• Settling- and Drying-effects

20 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Settling- and drying-effects

-> failed -> failed

1. first creep measurement at 20°C;after delivery

2. first creep measurement at 40°C

21 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Settling- and drying-effects

-> passed -> passed

3. first creep measurement at -10°C 4. repeat of creep measurement at 20°C

22 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Settling- and drying-effects

-> passed -> failed

3 days storingat 40°C

5. repeat of creep measurement at 40°C 6. further creep measurement at 40°Cafter 3 days storing at 40°C

23 / 19SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Table of contents

• Excitation voltage -> Creep and LC error

• Force introduction

• Material -> Zero point (Y)

• Types -> LC error

• Embodiment -> LC error

• Eccentricity -> LC error

• Stability of temperature -> Zero signal, LC signal

• Air flow -> Zero signal, LC signal

• Settling- and Drying-effects -> Creep

SIM MWG11 – Load Cells Tests by OIML R60 Buenos Aires, June 2010

Practical experiencesPractical experiences

with OIML R60with OIML R60

Sascha Mäuselein

Oliver Mack

Thank you for your attention