Table A
Index to Reference Key Items
Reference
Key Number Title of Item Page
300 INTRODUCTION 1
310 GENERAL CODE 4
310-1 I G-S.8. Provision for Sealing Electronic Adjustable Components, G-S.8.1. Access to Calibration and Configuration Adjustments, and G-S.8.2. Automatic or Semi-automatic Calibration Mechanism........4
310-2 I Appendix D – Definition of Electronic Devices, Software-Based and Built-For-Purpose Device........9
310-3 I G-S.1. Identification – (Software)........11
310-4 V GN.3. Verification of Testing Standards........16
310-5 W G-T.1. Acceptance Tolerances........19
320 SCALES 20
3201A V S.2.1.6. Combined Zero-Tare (“0/T”) Key, Appendix D – Definitions for Tare Mechanism, and Tare Balancing Mechanism........20
3201B V S.2.3. Design of Balance, Tare, Level, Damping, Arresting Mechanisms, and Appendix D – Tare-weighing Mechanism.........24
320-1C I S.2.3.3. through S.2.3.6. Value of Tare Indication and Recorded Representations, and Appendix D. Definitions for Gross Weight Value, Net Weight Value, Net Weight, Tare, and Tare Weight Value........25
320-1D I S.2.4. Preset Tare Mechanism and Appendix D – Definitions for Preset Tare........27
320-2 V T.N.4.6. Time Dependence (Creep) for Load Cells During Type Evaluation........29
3203 I S.1.7. Automatic Zero-Setting Mechanism........30
321 BELT-CONVEYOR SCALE SYSTEMS 33
3211 V UR.3.2.(c) Maintenance; Zero-Load Tests........33
3212 V N.3.1.4. Check for Consistency of the Conveyor Belt Along Its Entire Length........36
3213 V S.1.3.1. For Scales Installed After January 1, 1986 (Value of the Scale Division)........38
321-4 V S.1.6.1 Zero-load Indicator........38
3215 V N.2. Conditions of Tests, N.2.1. Initial Verification and N.3.2. Material Tests........39
3216 V T.1.1. Tolerance Values – Test of Zero Stability........41
3217 V N.3.1.2. Initial Stable Zero, N.3.1.3. Test of Zero Stability and S.3.1.1. Automatic Zero-Setting Mechanism........42
322 AUTOMATIC BULK-WEIGHING SYSTEMS 43
3221 I S.2.1. Zero-Load Adjustment........43
324 AUTOMATIC WEIGHING SYSTEMS 44
324-1 I S.2.1.7. Automatic Zero-Setting Mechanism........44
324-2A V S.2.2. Tare, S.2.2.1. Scale Interval and Capacity, S.2.2.2. Accuracy, and S.2.2.3. Damping........45
324-2B V S.2.2.3. Combined Zero-setting and Tare-balancing Mechanisms (0/T Key)........46
324-2C I S.2.2.3. Visibility of Operation and S.2.2.4. Subtractive Tare Mechanism........47
324-2D I S.2.2.5. Consecutive Tare Operations and S.2.2.6. Indication and Printing of Weighing Results........48
3242E I S.2.3. Preset Tare Mechanism and S.2.3.1. Indication of Operation........49
330 LIQUID-MEASURING DEVICES 50
3301 I Temperature Compensation for Liquid-Measuring Devices Code........50
3302 V N.4.6. Pour and Drain Times for Handheld Test Measures........58
3303 I Price Posting and Computing Capability and Requirements for a Retail Motor-Fuel Dispenser (RMFD)........59
3304 W T.5. Predominance – Retail Motor-Fuel Devices........64
331 VEHICLE-TANK METERS 67
3311 I T.2.1. Automatic Temperature-Compensating Systems........67
3312 V UR.2.5. Automatic Temperature Compensation for Refined Petroleum Products, UR.2.5.1. Use of Temperature Compensation System........70
3313 I UR.2.5.2.1. Automatic Temperature Compensation for Refined Petroleum Products........72
336 WATER METERS 73
3361 V S.1.1.3. Value of Smallest Unit and S.1.1.6. Proving Indicator........73
3362 W T.1.1. Repeatability........75
3363 I N.3. Test Drafts and N.4. Testing Procedures........77
360 OTHER ITEMS 82
3601 I International Organization of Legal Metrology (OIML) Report........82
360-2 Developing Items........84
Table B
Appendices
Appendix Title Page
A Item 360-2: Developing Items A1
Part 1, Item 1 Scales: S.1.4.6. Height and Definition of Minimum Reading Distance, UR.2.10. Primary Indicating Elements Provided by the User, UR.2.11. Minimum Reading Distance and Definitions of Minimum Reading Distance and Primary Indications........A1
Part 2, Item 1 Belt-Conveyor Scale Systems: UR.3.2.(c) Maintenance; Zero Load Tests........A1
Part 2, Item 2 Belt-Conveyor Scale Systems: N.3.1.4. Check for Consistency of the Conveyor Belt Along Its Entire Length........A1
Part 3, Item 1 Vehicle Tank Meters: T.4. Product Depletion Test........A2
Part 4, Item 1 Farm Milk Tanks: N.5.1. Verification of Master Metering Systems........A5
Part 5, Item 1 Hydrogen: New Code: 3.3X. Draft Hydrogen Gas-Measuring Devices........A6
B Comments from the NCWM ATC Steering Committee B1
C Water Meter Correspondence C1
D Jeff Humphrey’s Letter and Comments D1
