Maintenance and Troubleshooting
Frequently Asked Questions
4-2 Micro-Tech 9101/9201 Reference Manual, Rev J Thermo Fisher Scientific
Here is a list of frequently-asked questions (FAQs) to help you resolve
common problems and concerns about operating, calibrating, and
maintaining your scale.
Question Answer
What is the best way to calibrate my
scale?
The best way to calibrate your scale is to use the “Material Calibration”
method. (For details, see page B-13.) If, for whatever reason, you cannot
perform a Material Calibration on your scale, you can run a number of
“simulated-calibration” tests. For example, all Micro-Techs can be
calibrated using the “R-Cal” procedure, but you must have purchased the
optional equipment allowing you to run these simulated tests.
How often should the zero and span
be calibrated?
As a general rule, if you make or receive payments based upon the weight
readings from your scale, the scale should be zeroed daily and the span
checked weekly.
• Your scale is only as good as the repeatability of your error on repeated
zero calibrations.
• The span should never change drastically, if the zero is properly
maintained.
If an external contractor is responsible for maintaining your scale, he or she
will establish an appropriate schedule for testing your scale’s zero and
span.
How often should I check the
mechanical installation of the scale?
The scale should only need daily preventive-maintenance checks for
material build up in critical areas, such as under the weigh idlers. The
exception to this is, when changes are made to the scale area—for
example, when the belt or idlers are replaced. The scale area includes not
only the weighbridge, but also the idlers that are shimmed with scale.
• A 10-20-1 scale system’s scale area includes +3 to -3 of scale.
• A 10-14-4 scale area includes +5 to –5. Any maintenance in this area
should be realigned, shimmed, and spaced to the proper specifications.
If in doubt, please contact Thermo Fisher Scientific for the correct
specifications.
Why do I need to see repeatability
during calibrations?
The repeatability of a scale is important for the accuracy of the scale. If the
scale cannot repeat tests within the scale’s percentage of accuracy, then
you should investigate why the scale is not repeating within the appropriate
tolerances.
Every time I complete a zero or span
test and get a percentage of error, do I
say “Yes” each time to change the
zero or span?
The only time you should change zero or span is on the initial, start-up test.
Press the “Yes” button to change the span. In any subsequent test, even
when there is an error, press the “No” button—as any additional tests are
for repeatability, which is a maintenance feature of calibrations.
Frequently
Asked
Questions
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