Mettler Toledo PR/SR Operations Instructions Page 11

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9
PR/SR balances Startup procedure
2 Startup procedure
2.1 Cautionary notes
PR/SR balances may only be used indorrs.
Never operate PR/SR balances in hazardous areas.
Operate PR/SR balances only when connected to receptacle outlets with a ground connection.
PR/SR balances with built-in power supply unit can be made dead only by disconnecting the power plug.
The receptacle outlet must thus be near the balance and readily accessible.
In the case of PR balances with a separate power supply, use only the AC adapter supplied. The voltage
value printed on the adapter must match the local line voltage.
Electronics and measuring cells of the PR/SR balances are protected against the ingress of water and dust,
but they are not absolutely tight.
Never operate PR balances in surroundings which are always humid or extremely dusty.
In the case of SR balances, operation in humid or dusty surroundings is possible provided the balance is
carefully maintained.
Follow cleaning instructions (section 8.5). Protect power plug to ensure it never gets wet.
Never open your balance. Should you have problems with your balance on the odd occasion, please
contact your responsible METTLER TOLEDO dealer.
Proper location of high-resolution balances is one of the decisive factors affecting
the accuracy of the weighing results. Hence, pay attention to the following points:
stable, vibration-free support as horizontal as possible,
no direct sunlight,
no excessive temperature fluctuations,
no drafts.
The best location is a stable bench in a corner protected against drafts and as far as
possible from doors, windows, heating systems or ventilation slots of air
conditioning units.
If vibrations can not be avoided, the balance can still provide precise results if it is
matched to its environment (see section 6.2).
2.2 Setting up
The optimum location for precise weighing
Influence of ambient conditions on the weighing sample
Ambient conditions not only influence the informative value of the measurement results with regard to
accuracy, but can also have an effect on the mass of the weighing sample.
The atmospheric humidity influences the mass, e.g. by a film of moisture, by water absorption in the case
of hygroscopic weighing samples or through sample desiccation.
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