Rice Lake BCi Belt Scale - Installation & Operation Manual Version 2.00 - Manual (Page 61)

BCi Installation & Operation Manual - Handbook 44 Requirements for Belt-Conveyor Scales 55
7.0 Handbook 44 Requirements for Belt-Conveyor Scales
A belt conveyor scale system must be tested after it is installed according to Handbook 44. It must be tested on
the conveyor system with which is to be used and under such environmental conditions as may normally be
expected. Each test shall be conducted with test loads no less than the minimum test load.
Material testing is the only known way to establish repeatability and traceable accuracy of a belt scale system.
Normally three or more successive material tests are required to achieve acceptance accuracy and demonstrate
repeatability of the belt scale system.
Following a material test, one or more methods of simulated testing is employed to ensure repeatability and
maintenance accuracy. Material tests should be conducted at least every six months. Material tests should also be
done immediately after conveyor maintenance that could affect the scale.
Once the belt scale is installed properly, use the following procedures to material test the scale.
7.1 Reference Test
Reference scale is used to pre-weigh or post-weigh the actual material that will be used for calibration of the belt
scale. The different types that may be used are:
• Static vehicle scale
• Static track scale
• A certified belt scale
• Uncoupled full bridge in-motion track scale
• Uncouple double draft in-motion track scale
• Test weigh bin
• Garner system
The following scales and methods are not acceptable for material testing.
• Coupled in motion track scale
• Marine draft survey
• Truck or bucket count
7.2 Conditions of Test
A belt scale needs to be tested after it’s installed on the conveyor system that it’s to be used with. It also needs to
be tested under the same environmental conditions as may normally be expected. It needs to be tested at normal
use capacity and can be tested at any other rate of flow that may be used at the installation. Three tests are
required. Each test shall be conducted for the following.
Handbook 44
• Not less than 1000 scale divisions
• At least three revolutions of the belt
• At least 10 minute’s operation or for a normal weighment
AAR Scale Handbook
• Not less than 1000 scale divisions
• At least three revolutions of the belt
• At least 10 minute’s operation or sufficient time to deliver a normal weighment.