Laboratory manual for the evaluation of non-automatic weighing devices
Part 2, section 19—Tilting (off-level effect)
Table of contents
- 19.0 Tilting (off-level effect)—Generalities
Section 21 of the Specifications Relating to Non Automatic Weighing Devices
19.0 Tilting (off-level effect)—Generalities
Under section 21 of the Specifications, portable or movable devices, other than of the freely suspended type, must perform within tolerances when tilted up to 3°, in any direction. If they can perform within tolerances only when leveled, they must be equipped with permanent and sensitive level indicating means (usually a bubble level).
Vehicle mounted weighing devices such as onboard weighing systems for NH3, onboard weighing systems for waste collection, and scales mounted on lift trucks must be able to provide an accurate weight reading up to at least 3°.
19.1 Portable or movable devices
Complete scales or load receiving elements other than onboard weighing devices must meet one of the following conditions:
19.1.1 The device weighs within prescribed tolerances, when off level by up to 3°; or
19.1.2 The device is equipped with a permanently installed level indicator as standard feature.
Note: If the device is not equipped with a suitable level indicator, perform the tests described in LG-3.04 of Part III, Performance Tests.
If the device has a level indicating means, the following requirements must be met:
126.96.36.199 The level indicating means must be permanently and rigidly mounted on a permanent section of the scale. It must be located so as to be easily read. It must be protected from damage and must be sufficiently sensitive.
188.8.131.52 The level indicating means must be readily observable without disassembly that requires the use of tools.
- On small portable devices, the level indicating means may be placed under the platter (if the platter can be lifted easily) or at the back of the scale (if it can be readily observed).
- A bubble level placed under the platform of a movable floor scale is not acceptable if the platform is relatively heavy and requires tools or assistance to be lift up in order to access the level indicator.
- The level indicating means must be permanently attached to a permanent part of the scale (e.g. it is not sufficient to attach it to the platter if the patter is removable).
184.108.40.206 The level indicating means must be sufficiently sensitive. Perform the test described in LG‑3.05, Part III, Performance Tests.
19.2 Onboard weighing systems
Definition a weighing device designed as an integral part of or attached to or secured to the frame, chassis, lifting mechanism or the bed of mobile equipment such as a vehicle, trailer, tractor, or forklift.
19.2.1 The device provides a weight indication up to 3° in any upright direction.
19.2.2 The device weighs within tolerances when off level by the largest of
- 3° ; or
- maximum inclination at which a weight indication is still provided.
19.2.3 The weight indication blanks when the inclination is such that the device ceases to weigh accurately.
19.2.4 Scales mounted on lift trucks (or similar vehicles) must blank their indications when the lift truck is moving, unless the scale can provide an accurate weight indication. Perform an accuracy (in-motion) test using different loads within the capacity range of the device. The test must simulate actual conditions of use.
Note: See the complete test procedure LG-3.04, Part 3, Performance Tests.
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