Laboratory manual for the evaluation of non-automatic weighing devices

Part 2, section 19—Tilting (off-level effect)

Table of contents


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: 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. The level indicating means must be readily observable without disassembly that requires the use of tools.

Clarifications 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

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.


Original document

Date modified: