General Information; Service Prerequisites - Sartorius Micro MC Series Service Manual

Work Area
Measuring and Test Equipment
Warning

General Information

Service Prerequisites

Prerequisites for working on Sartorius high-resolution balances include
considerable experience, completion of a Service Course at the main office in
Göttingen, and the special tools and equipment described below. Please do
not attempt or permit any unauthorized repair work!
Never perform any repairs on the weighing system. Defective units must be
sent to your local SARTORIUS Repair Center or to the main factory in
Goettingen, Germany.
If you remove the seals (warranty stickers), you will forfeit all warranty
claims!
Notes on the optimum work area:
Before you carry out any tests or adjustments, always make sure that the
balance is set up under optimum ambient conditions, has been leveled with
the level indicator and allowed to warm up.
The best conditions for high-resolution balances include:
– solid, level surface that is free of vibrations
– room with a constant temperature (± 0.5K*) during weighing
– no direct heat exposure (sun, heaters etc.)
– no drafts (open windows, doors or vents)
Allow the balance to warm up for at least the recommended time of 6 hours. If
the user needs the results of the balance test for evaluation, he or she must use
the balance at the same location after it has warmed up. Always wait a while
before carrying out any tests or adjustments whenever the balance has been
transferred to a different place of installation or the balance housing has been
opened.
Information on the measuring and test equipment that may be used:
The most important measuring and test equipment are weights.
Selection of the right measuring and test equipment is crucial for every test. The
test equipment, i.e. the weights, must generally have a higher accuracy than
that of balance to be checked.
Only calibrated weights with a calibration certificate may be used for testing
and adjusting the (absolute) linearity or span. To protect the calibrated
weights, non-calibrated weights should always be used for all other tests
(reproducibility, off-center load test = eccentricity testing). The calibration
certificates and documents state the nominal mass value of the weight as well
as the error limits and uncertainty of measurement.
During every test, calibration or adjustment of a balance, it is important for you
to be informed about the test equipment (the set of weights):
– Is the accuracy sufficient?
– Is the calibration certificate still valid?
– Is there evidence of any damage?
Never test or adjust the balance with unsuitable measuring and test
equipment.
SARTORIUS RC/MC-Balances
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