Analyzer Maintenance
V-4
Thermo Scientific Orion 2120XP Calcium Hardness Analyzer User Guide
Warning:
Formic acid reagent is hazardous. Use protective glasses and
gloves. Refer to the bottle label for precautions and work in a well-
ventilated area.
Note:
Turn off the air pump before beginning this procedure; otherwise,
the air pump will splatter the reagent outward as the bottle is removed.
1. Remove the thumbnut and slide the bottle adaptor from the flow cell.
2. Unscrew the cap and lift the bottle adaptor from the reagent bottle.
3. Remove both ends of the old diffusion tubing from the reagent bottle
adaptor nipples. Properly dispose of spent reagent and tubing.
4. Fit the ends of the new diffusion tubing over the bottle adaptor nipples.
5. In a hood or outdoors, carefully remove the cap from a new reagent
bottle.
6. Make sure that the large O-ring is between the reagent bottle and bottle
adaptor. Slide the diffusion tubing loops into the reagent bottle and
screw the bottle adaptor onto the new reagent bottle.
7. Ensure that the three small O-rings are in place on the flow cell.
8. Reattach the bottle adaptor/reagent bottle assembly to the flow cell
by sliding it onto the screw and tightening the thumbnut. The bottle
adaptor can be rotated to allow correct positioning on the analyzer.
Replacement of
Reagent and Diffusion
Tubing Assembly
Figure V-1
Reagent Bottle Assembly
Reagent Bottle Cap
Thumbnut
Flow Cell Assembly Face
Reagent Bottle Nipple
Reagent Bottle Adapter
Small O-rings
Large O-ring
Reagent
Diffusion Tube