MATERIAL TEST
The MSI is guaranteed to be accurate to
±
0.25% when installed on a conveyor in accordance with this manual
and meeting the qualifications outlined in Manual PL-328 "MMI Applications Guidlines". This guarantee is
based on calibrations performed using the test weights furnished with the scale and as previously referenced.
When the existing conditions are such that the installation of the scale cannot meet the above mentioned
requirements for an approved installation it is recommended that material tests be performed. This will enable
the user to compare the present scale results to the results of the material tests. The scale is then adjusted or
factored so that subsequent scale calibrations with test weights will agree with actual run of material.
At least 3 samples of a minimum of 10 minutes duration at normal capacity should be taken to insure
repeatability. Refer to "Material Test" and subsequent "Factoring" sections of the integrator manual.
RE-RATING
Any significant change in rate, speed and /or idler spacing from original design specifications should be
referred to your local Milltronics office to insure that proper design parameters are maintained.
MAINTENANCE AND SPARE PARTS
Each weighbridge should be kept clean. Accumulations of material between the weighing assembly and
static assembly as well as around each load cell can be detrimental to the weighing accuracy.
Periodically check the mechanical integrity of the scale and alignment of the stringers and idlers within the
weighing area.
The integrity of the load cells can be seen when zero and span calibrations are performed. If the zero and
span deviations display a continuous unidirectional drift or the system becomes uncalibratable for no apparent
mechanical reason, the load cells may be suspect.
Replacement of load cell(s) will require a re-balancing of the load cells. Refer to the load cell balancing
procedure for four load cells in the integrator manual.
The only spare part recommended for the MSI is the load cell. Refer to the load cell nameplate for the proper
size and model number.
Precautions :
» when arc welding near the scale do not allow current to pass through the belt scale.
» reset the shipping stops to reduce physical shock to the load cells during maintenance.
» recalibrate after maintenance and prior to use.
PL-327
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