Ordering Information:

Reference electrode Orion 900100 is recommended for all pH and ion-selective measurements except for those:

• In dilute solutions where the ion to be measured is contained in the filling solution of the Orion 900100
• In solutions where an ion in the filling solution would introduce an electrode interference
• In solutions where a species is present which forms a precipitate with an ion contained in the filling solution of the Orion 900100

For these samples, the double junction reference electrode, Orion 900200, with an appropriate intermediate filling solution, is recommended.

When filled with Orion 900001 Filling Solution, the Orion 900100 matches the potential characteristics of a conventional KCl saturated calomel electrode.

Recommended for:

• Many ISE determinations
• Routine pH measurements with Orion 910100 Electrodes