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.

This manual is related to the following products:

XVS Ventilation Stations 4865022 XVS Ventilation Stations 4865021 XVS Ventilation Stations 4865012 XVS Ventilation Stations 4865011 XVS Ventilation Stations 4865010 XVS Ventilation Stations 4864042 XVS Ventilation Stations 4864041 XVS Ventilation Stations 4864032 XVS Ventilation Stations 4864031 XVS Ventilation Stations 4864030 XVS Ventilation Stations 4864022 XVS Ventilation Stations 4864021 XVS Ventilation Stations 4864012 XVS Ventilation Stations 4864011 XVS Ventilation Stations 4864010 XVS Ventilation Stations 4863042 XVS Ventilation Stations 4863041 XVS Ventilation Stations 4863032 XVS Ventilation Stations 4863031 XVS Ventilation Stations 4863030 XVS Ventilation Stations 4863022 XVS Ventilation Stations 4863021 XVS Ventilation Stations 4863012 XVS Ventilation Stations 4863011 XVS Ventilation Stations 4863010 XVS Ventilation Stations 4862042 XVS Ventilation Stations 4862041 XVS Ventilation Stations 4862032 XVS Ventilation Stations 4862031 XVS Ventilation Stations 4862030 XVS Ventilation Stations 4862022 XVS Ventilation Stations 4862021 XVS Ventilation Stations 4862012 XVS Ventilation Stations 4862011 XVS Ventilation Stations 4862010 XPert Balance Enclosures 3971872 XPert Balance Enclosures 3971871 XPert Balance Enclosures 3971862 XPert Balance Enclosures 3971861 XPert Balance Enclosures 3971860 XPert Balance Enclosures 3971842 XPert Balance Enclosures 3971841 XPert Balance Enclosures 3971832 XPert Balance Enclosures 3971831 XPert Balance Enclosures 3971830 XPert Balance Enclosures 3971822 XPert Balance Enclosures 3971821 XPert Balance Enclosures 3971802 XPert Balance Enclosures 3971801 XPert Balance Enclosures 3971800 XPert Balance Enclosures 3971672 XPert Balance Enclosures 3971671 XPert Balance Enclosures 3971662 XPert Balance Enclosures 3971661 XPert Balance Enclosures 3971660 XPert Balance Enclosures 3971642 XPert Balance Enclosures 3971641 XPert Balance Enclosures 3971632 XPert Balance Enclosures 3971631 XPert Balance Enclosures 3971630 XPert Balance Enclosures 3971622 XPert Balance Enclosures 3971621 XPert Balance Enclosures 3971602 XPert Balance Enclosures 3971601 XPert Balance Enclosures 3971600 XPert Balance Enclosures 3971572 XPert Balance Enclosures 3971571 XPert Balance Enclosures 3971562 XPert Balance Enclosures 3971561 XPert Balance Enclosures 3971560 XPert Balance Enclosures 3971542 XPert Balance Enclosures 3971541 XPert Balance Enclosures 3971532 XPert Balance Enclosures 3971531 XPert Balance Enclosures 3971530 XPert Balance Enclosures 3971522 XPert Balance Enclosures 3971521 XPert Balance Enclosures 3971502 XPert Balance Enclosures 3971501 XPert Balance Enclosures 3971500 XPert Balance Enclosures 3930442 XPert Balance Enclosures 3030441 XPert Balance Enclosures 3930432 XPert Balance Enclosures 3930431 XPert Balance Enclosures 3930430 XPert Balance Enclosures 3930422 XPert Balance Enclosures 3930421 XPert Balance Enclosures 3930402 XPert Balance Enclosures 3930401 XPert Balance Enclosures 3930400 XPert Balance Enclosures 3930342 XPert Balance Enclosures 3030341 XPert Balance Enclosures 3930332 XPert Balance Enclosures 3930331 XPert Balance Enclosures 3930330 XPert Balance Enclosures 3930322 XPert Balance Enclosures 3930321 XPert Balance Enclosures 3930302 XPert Balance Enclosures 3930301 XPert Balance Enclosures 3930300 XPert Balance Enclosures 3930242 XPert Balance Enclosures 3030241 XPert Balance Enclosures 3930232 XPert Balance Enclosures 3930231 XPert Balance Enclosures 3930230 XPert Balance Enclosures 3930222 XPert Balance Enclosures 3930221 XPert Balance Enclosures 3930202 XPert Balance Enclosures 3930201 XPert Balance Enclosures 3930200