Analyzer Preparation
II-13
Thermo Scientific Orion 2120XP Calcium Hardness Analyzer User Guide
1. Unpack the reference electrode (Cat. No. 100056) and its instruction
sheet from the shipping box.
2. Carefully remove the protective caps from the bottom and sidearm of
the reference electrode. Save the caps for future storage of the electrode.
3. Shake out as much of the fill solution as possible through the sidearm.
Drain the fill solution through the sidearm or use a pipet or syringe.
4. While passing the 1/8 inch tubing into electrode sidearm, slide the 1/4
inch tubing over the sidearm. The outside tubing should extend 3/8 to
1/2 inches over sidearm. Refer to
Figure II-10
.
5. Remove the cap and fluid seal from reference electrode fill solution
bottle (Cat. No. 181073). Hold the bottle in an upright position.
Check that the rubber gasket is properly aligned, and then connect
the cap end of the tubing assembly to the bottle. The 1/8 inch tubing
should extend into the bottle.
6. Hold the reservoir bottle above the electrode with the bottle cap end
down. The electrode should be horizontal with the sidearm pointing
up. Gently shake the electrode to allow any trapped air bubbles to rise
into the bottle as the electrode fills with solution.
7. Dry off the ceramic frit on the base of the electrode with a lint-free
wipe. Squeeze the bottle for a few seconds. A small amount of filling
solution should bead up on the frit surface, indicating good filling
solution flow. If no moisture is visible, the electrode is clogged and
should be cleaned or replaced.
Installation of a New
Reference Electrode
Reference Electrode
Filling Solution
Gasket
Tubing Bottle Adaptor
Small 1/8” Tubing Inside
Bottle Cap
Large 1/4” Tubing
Electrode Sidearm
Ceramic Frit
Figure II-10
Reference Electrode
with Filling Solution
