Rice Lake Master BS211, Installation Manual

Page: 7 / 15

2 BS211 Belt Scale
1.2 Overview
The weighframe model
BS211
is designed for heavier applications in the process industry, where good accuracy
and/or legal approval is demanded.
The dimensions are generated from the construction of the existing or to be build belt conveyor.
Optionally this belt scale can be supplied with the approval according to the ATEX directive in the categories II2D
or II3D.
Theory of Operation
The material is carried by the belt and the under laying rollers. One or more of these rollers is mounted on the
weighframe and is weighed. Therefore the amount of material lying on the belt is weighed. The belt speed is
measured as well.
Both values (belt load and belt speed) are calculated in an integration function in the electronics. These electronics
totalize, calculate the mass flow, displays these and transfers it through outputs or any other way of communication
to a control system or network.
For the operation, we refer to the manual of the electronics installed.
1.3 Selection Criteria
After choosing the belt scale model
BS211
, the dimensions are determined.
The capacity of the load cells are calculated based on the maximum belt load, the dead load of the weighframe and
the weigh roller.
1.4 Calibration and Test Weight Device
The weighframe can be provided with mounting points to apply test weights. This is to check accuracy, after the
initial calibration has been done. Then the reproducibility and the state of the belt scale can be determined.
To determine absolute accuracy, it is necessary to do a test with material. For this procedure, we refer to the manual
of the electronics installed.