Instruction manual

Required Equipment
Meter — Any Orion pH or ion-selective meter, or other pH/lSE
meter with appropriate connectors.
Electrode — Combination pH Electrode, or pH and Reference
Electrode Half Cells. Use the Orion 8003 ROSS
™
Sure-Flow
®
Reference Half Cell Electrode with a ROSS Half Cell.
Thermometer — Readable to ± 0.5 °C.
Beakers — Plastic or glass.
Magnetic Stirrer — Suggested for precision measurements.
Required Solutions
pH Buffers - Two are recommended for precise measurement. The
first near the electrode isopotential point (pH 7) and the second
near the expected sample pH (e.g., pH 4 or 10).
ROSS Internal Filling Solution — 3 M KCl, Orion 810007. Do not
use any filling solution which contains silver. (Electrode damage
may result.)
Figure 1: Orion 8172 ROSS Sure-Flow Combination
2
Orion 8175
filling hole
ROSS
internal reference
filling solution
chamber
Sure-Flow
sleeve junction
pH sensing bulb