Advanced Instruments OsmoPRO - Known Limitations

10
The OsmoPRO
®
Micro-Osmometer Service Manual
1Performance at Reference Conditions: 20 °C to 25 °C (68 °F to 77 °F); 40 to 60 % relative humidity; tolerances
of reference or calibration solutions excluded.
2
Operating Conditions: Temperature 18 °C to 35 °C (64 °F to 95 °F); 30% to 80 % relative humidity (non-condens-
ing).
Known Limitations
• Additives such as anti-coagulants from collection tubes may contribute to the measured
osmolality.
• Particulate matter can cause premature crystallization, i.e. sample pre-freeze. The particulate
matter may be eliminated in blood and urine by centrifugation. It may also be eliminated in
urine by filtration.
• Samples with air bubbles do not reliably freeze and may yield inaccurate results.
• Samples allowed to evaporate will yield higher osmolality values.
• Non-aqueous solutions will not yield accurate results. The OsmoPRO is intended to test
aqueous solutions only.
• Highly viscous solutions may not reliably freeze and may yield inaccurate results.
• High concentrations of ethanol, acetone, methanol, isopropanol, ethylene glycol, diethyl
ether, paraldehyde, trichloroethane, or propylene glycol may not reliably freeze and may
yield inaccurate results.