NIST Handbook 44 Proposed Requirements for Tare · PDF fileSeptember 2008 3 Reasons for Tare...

NIST Handbook 44 NIST Handbook 44 Proposed RequirementsProposed Requirements
for Tarefor TareWWMA 51WWMA 51stst Annual Technical ConferenceAnnual Technical Conference
September 7September 712, 200812, 2008Presented by:Presented by:Steven CookSteven Cook

September 2008September 2008 22
BackgroundBackground
Reasons for Tare ProposalsReasons for Tare ProposalsReview of Model W&M Law in H130Review of Model W&M Law in H130Review of Existing Tare RequirementsReview of Existing Tare RequirementsTare Work GroupTare Work GroupRecently Adopted Tare LanguageRecently Adopted Tare LanguageTare Proposals Still Under ConsiderationTare Proposals Still Under Consideration

Reasons for Tare ProposalsReasons for Tare ProposalsConfusion in Terminology and DefinitionsConfusion in Terminology and Definitions
Differences with International RequirementsDifferences with International RequirementsDifferent Terms for the Same Tare FunctionsDifferent Terms for the Same Tare Functions
Inconsistent Interpretations of GInconsistent Interpretations of G--S.2. Facilitation S.2. Facilitation of Fraudof Fraud
Increasing Difficulty in NTEP EvaluationsIncreasing Difficulty in NTEP EvaluationsSoftware Developers for Accessory DevicesSoftware Developers for Accessory DevicesRounding of Tare InterpretationsRounding of Tare Interpretations
Field EnforcementField EnforcementAccuracy of TareAccuracy of TareRounding of TareRounding of Tare
Other Examples?Other Examples?

NIST Handbook 130 NIST Handbook 130 Model W&M Law Model W&M Law -- ReviewReview
1.1. Weight(s) and (or) Measure(s). 1.1. Weight(s) and (or) Measure(s). -- The term "weight(s) The term "weight(s) and (or) measure(s)" means all weights and measures and (or) measure(s)" means all weights and measures of every kind, of every kind, instruments and devices for instruments and devices for weighing and measuring, and any appliance and weighing and measuring, and any appliance and accessories associated with any or all such accessories associated with any or all such instruments and devicesinstruments and devices..
1.8. Net "Mass" or Net "Weight." 1.8. Net "Mass" or Net "Weight." -- . . .weight . . . of a . . .weight . . . of a commodity commodity excluding any materials, substances, or excluding any materials, substances, or items not considered to be part of the commodity.items not considered to be part of the commodity.Materials, substances, or items not considered to be Materials, substances, or items not considered to be part of the commodity include. . . part of the commodity include. . .

Section 15. Misrepresentation of QuantitySection 15. Misrepresentation of Quantity
No No personperson shall:shall:
(a)(a) take more than the represented quantity when, as take more than the represented quantity when, as buyer, he/she furnishes the weight or measure by buyer, he/she furnishes the weight or measure by means of which the quantity is determined, normeans of which the quantity is determined, nor
(b)(b) sell, offer, or expose for sale a quantity less than the sell, offer, or expose for sale a quantity less than the quantity represented, norquantity represented, nor
(c)(c) represent the quantity in any manner calculated or represent the quantity in any manner calculated or tending to mislead or in any way deceive another tending to mislead or in any way deceive another person.person.

Section 22. Prohibited ActsSection 22. Prohibited Acts
No No personperson shall:shall:
(a)(a) use or have in possession for use in commerce any use or have in possession for use in commerce any incorrect weight or measure;incorrect weight or measure;
(b)(b) sell or offer for sale for use in commerce any sell or offer for sale for use in commerce any incorrect weight or measure;incorrect weight or measure;
(c)(c) . . . . . .

Existing RequirementsExisting Requirements(Other Than G(Other Than G--S.2. Facilitation of Fraud)S.2. Facilitation of Fraud)
Handbook 44 Scales Code (2008)Handbook 44 Scales Code (2008)S.2.1.6. Combined ZeroS.2.1.6. Combined Zero--Tare (Tare (""0/T0/T"") Key) KeyS.2.3. TareS.2.3. Tare
ValueValueOperate in Backward DirectionOperate in Backward DirectionAutomatic Clearing of TareAutomatic Clearing of Tare
S.2.3.1. Monorail Scales Equipped with S.2.3.1. Monorail Scales Equipped with Digital IndicationsDigital IndicationsN.1.12. StrainN.1.12. Strain--Load TestLoad Test

Existing RequirementsExisting Requirements(Other Than G(Other Than G--S.2. Facilitation of Fraud)S.2. Facilitation of Fraud)
NCWM Publication 14NCWM Publication 14Over 8 Pages of Evaluation Criteria including but not Over 8 Pages of Evaluation Criteria including but not limited to:limited to:
MultiMulti--interval/Multiple Range Scalesinterval/Multiple Range ScalesMultiple Tare Register MemoriesMultiple Tare Register MemoriesOperationOperation-- Facilitation of FraudFacilitation of FraudSemiautomatic TareSemiautomatic TareKeyboard/Programmable TareKeyboard/Programmable TarePushbutton TarePushbutton TareDigital TareDigital TareStored TareStored TareWeighWeigh--in/Weighin/Weigh--out Vehicle Scale Applicationout Vehicle Scale ApplicationPercentage/Proportional TarePercentage/Proportional TareIndication and Recorded RepresentationsIndication and Recorded Representations

Existing RequirementsExisting RequirementsPublication 14 Tare Requirements are Publication 14 Tare Requirements are Predominantly Equivalent with OIML R76.Predominantly Equivalent with OIML R76.
Differences Include:Differences Include:Consistent Use of Terminology And DefinitionsConsistent Use of Terminology And DefinitionsDistinction of The Two Main Types of TareDistinction of The Two Main Types of Tare
MetrologicalMetrologicalPreset/PredeterminedPreset/Predetermined
Specific Requirements for the Indication and Recorded Specific Requirements for the Indication and Recorded Representation for Preset TareRepresentation for Preset TareException for Mathematical AgreementException for Mathematical Agreement
((Gross Gross Tare Tare NetNet) Under Specific Conditions) Under Specific ConditionsSpecific Performance Tests with Tare in EffectSpecific Performance Tests with Tare in Effect

NTETC Weighing SectorNTETC Weighing SectorTare Work Group (WG)Tare Work Group (WG)
Established 2006 by NTETC Weighing Established 2006 by NTETC Weighing SectorSectorWG Charges:WG Charges:
Develop Recommendation for the Tare Develop Recommendation for the Tare Rounding Differences Between Single Range Rounding Differences Between Single Range Scales and MI/MR ScalesScales and MI/MR ScalesReview Tare Requirements in Pub 14 and Review Tare Requirements in Pub 14 and H44H44Develop Recommendation to Include Pub 14 Develop Recommendation to Include Pub 14 Evaluation Criteria for Tare in H44Evaluation Criteria for Tare in H44

WG Recommendations for TareWG Recommendations for TareAdopted into H44 Scales Code for 2009Adopted into H44 Scales Code for 2009
S.1.1.1. (c) Digital Indicating Elements. S.1.1.1. (c) Digital Indicating Elements. Amended to Include CZ Indication When Amended to Include CZ Indication When Net Zero is Net Zero is 1/4d1/4d
S.1.2. Value of Scale Division amended to S.1.2. Value of Scale Division amended to include an exception and example to d include an exception and example to d expressed other than 1, 2, or 5 for MI and expressed other than 1, 2, or 5 for MI and MR ScaleMR Scale

S.1.2. Value of Scale Division S.1.2. Value of Scale Division ExampleExample(Indicated and Printed)(Indicated and Printed)
Capacity:Capacity: WR1 = 0 WR1 = 0 -- 4 kg x 2 g4 kg x 2 gWR2 = 4 WR2 = 4 -- 10 kg x 5 g10 kg x 5 gWR3 = 10 WR3 = 10 -- 20 kg x 10 g20 kg x 10 g
OIML R76 H44 (08) H44 (09)OIML R76 H44 (08) H44 (09)13.380 kg13.380 kg 13.380 kg 13.380 kg 13.380 kg13.380 kg GROSSGROSS--3.814 kg3.814 kg --3.810 kg*3.810 kg* --3.814 kg3.814 kg TARETARE9.565 kg9.565 kg 9.570 kg9.570 kg 9.566 kg9.566 kg NETNET
* 3.814 rounded to the nearest d for * 3.814 rounded to the nearest d for WR2WR2

T.N.2.1. GeneralT.N.2.1. General (Tolerances) (Tolerances) The tolerance values The tolerance values are positiveare positive (+) and negative(+) and negative ((--) with the weighing device ) with the weighing device adjusted to zero at no load. When tare is in use, the adjusted to zero at no load. When tare is in use, the tolerance values are applied from the tare zero reference tolerance values are applied from the tare zero reference (zero net indication)(zero net indication); the tolerance values apply to ; the tolerance values apply to the the net weight indication for any possible tare load usingnet weight indication for any possible tare load usingcertified test loads.cert

NIST Handbook 44 Proposed Requirements for Tare · PDF fileSeptember 2008 3 Reasons for Tare...

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