Field Inspection Manual — Automatic Weighing Devices

Part 3, Section C: Standards Accuracy Class – Automatic Weighing Device

The following tables list the required accuracy standard for an inspection of a given device Automatic Device class. Individual tables are provided for Acceptance and In-Service as well as for Metric and Avoirdupuis units of measure.

Required accuracy class of the standard - Acceptance
Metric Device type
(Automatic)
E1 E2 F1 F2 M1 M1-2 M2 M2-3 M3
Automatic scale (0.075%) R174 E1 ≥ 20 mg E2 ≥ 50 mg F1 ≥ 500 mg F2 ≥ 2 mg M1 ≥ 10 g All M2 ≥ 50 g - -
Automatic hopper / tank scale (0.05%) - R188 All All All All All All All - -
In-motion railway scale Static Test (0.075%) R189, 174 All All All All All All All - -
In-motion railway scale (approx. 0.15%) R189.2, 190, 191 All All All All All All All All All
Automatic crane scale Freight (0.5%) - R192 All All All All All All All All All
Conveyor belt scale - cheap commodities (0.5%) - R193 Material tests
Required accuracy class of the standard - In Service
Metric Device type
(Automatic)
E1 E2 F1 F2 M1 M1-2 M2 M2-3 M3
Automatic scale (0.1%) R175 E1 ≥ 10 mg E2 ≥ 50 mg F1 ≥ 200 mg F2 ≥ 1 g M1 ≥ 5 g All M2 ≥ 50 g M2-3 ≤ 5000 kg -
Automatic hopper / tank scale (0.1%) - R188 All All All All All All All M2-3 ≤ 5000 kg -
In-motion railway scale Static Test (0.1%) R189, 175 All All All All All All All M2-3 ≤ 5000 kg -
In-motion railway scale (approx. 0.15%) R189.2, 190, 191 All All All All All All All All All
Automatic crane scale Freight (0.5%) - R192 All All All All All All All All All
Conveyor belt scale - cheap commodities (0.5%) R193 Material tests
Required accuracy class of the standard - Acceptance
Avoirdupois Device type
(Automatic)
E1 E2 F1 F2 M1 M1-2 M2 M2-3 M3
Automatic scale (0.075%) R174 NA
  • E2 ≥ 1 gr
    or
  • E2 ≥ 0.0002 tr oz
  • F1 ≥ 6 gr
    or
  • F1 ≥ 0.01 tr oz
    or
  • F1 ≥ 0.001 lb
  • F2 ≥ 30 gr
    or
  • F2 ≥ 0.05 tr oz
    or
  • F2 ≥ 0.005 lb
  • M1 ≥ 200 gr
    or
  • M1 ≥ 0.05 tr oz
    or
  • M1 ≥ 0.02 lb
    or
  • M1 ≥ 0.5 oz
All
  • M2 ≥ 1000 gr
    or
  • M2 ≥ 0.1 lb
    or
  • M2 ≥ 2 oz
- -
Automatic hopper / tank scale (0.05%) - R188 NA All All All All All All - -
In-motion railway scale Static Test (0.075%) R189, 174 NA All All All All All All - -
In-motion railway scale (approx. 0.15%) R189.2, 190, 191 NA All All All All All All All All
Automatic crane scale Freight (0.5%) - R192 NA All All All All All All All All
Conveyor belt scale - cheap commodities (0.5%) - R193 Material tests
Required accuracy class of the standard - In Service
Avoirdupois Device type
(Automatic)
E1 E2 F1 F2 M1 M1-2 M2 M2-3 M3
Automatic scale (0.1%) R175 NA
  • E2 ≥ 1 grain
    or
  • E2 ≥ 0.0002 tr oz
  • F1 ≥ 3 gr
    or
  • F1 ≥ 0.01 tr oz
    or
  • F1 ≥ 0.001 lb
  • F2 ≥ 20 gr
    or
  • F2 ≥ 0.05 tr oz
    or
  • F2 ≥ 0.002 lb
  • M1 ≥ 100 gr
    or
  • M1 ≥ 0.02 tr oz
    or
  • M1 ≥ 0.02 lb
    or
  • M1 ≥ 0.25 oz
All
  • M2 ≥ 600 gr
    or
  • M2 ≥ 0.1 lb
    or
  • M2 ≥ 2 oz
M2-3 ≤ 10 000 lb -
Automatic hopper / tank scale (0.1%) - R188 NA All All All All All All M2-3 ≤ 10 000 lb -
In-motion railway scale Static test (0.1%) R189, 175 NA All All All All All All M2-3 ≤ 10 000 lb -
In-motion railway scale (approx. 0.15%) R189.2, 190, 191 NA All All All All All All All All
Automatic crane scale Freight (0.5%) - R192 NA All All All All All All All All
Conveyor belt scale - cheap commodities (0.5%) R193 Material tests

Notes

Revision

Rev.1: The purpose of revision 1 was to remove all references to bulletin M-02, which has been revoked.

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