Labconco XVS Ventilation Stations 4865060 User Manual

Page 58

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Chemir Analytical Services conducted balance stability tests on the XPert
Filtered Balance System mounted on a Solid Epoxy Work Surface. No
marble slab was used. The enclosure was tested while operating at three face
velocities – 0, 78 fpm (factory setting), and 100 fpm. Samples of 5 mg, 50
mg and 100 mg were weighed on an analytical balance located inside the
enclosure. Test results were excellent and confirm that the XPert Filtered
Balance System, including its built-in blower and the airflow through the
enclosure, caused no detectable instability to the balance. The weight of each
sample was stable to five decimal places.

Listed next are some hints on balance stability.

1. Balance is not calibrated (or at least not recently) – All balances

should be calibrated at least annually or after they have been shipped
or moved around frequently. If the balance has just been moved
around the lab, it probably will not require recalibration. Most new
balances have an internal mechanism that compensates for drift and
vibration. If in doubt, schedule recalibration.

2. Shield is not tight on the balance – If the balance shield is loose, air

can get into the weighing chamber and cause fluctuation in sensitive
weigh applications. In other words, air can get into the balance and
cause the weigh plate to fluctuate. The best way to address the
problem is to have the balance servicer fix the balance shield.

3. There is no shield on the balance – Sometimes open balances without

shields fluctuate. Try running the ventilated balance enclosure at
slower speeds such as 60-70 feet per minute, getting a shield placed
around the balance, or using a balance with a tight shield.

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