practical experiences with oiml r60
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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
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