Analyzer Maintenance
V-5
Thermo Scientific Orion 2120XP Calcium Hardness Analyzer User Guide
Yearly Preventive
Maintenance
Electrodes
1. Replace the Thermo Scientific Orion reference electrode
(Cat. No. 100056). Refer to
Chapter II, Installing a New Reference
Electrode
for step-by-step instructions.
2. Replace the Thermo Scientific Orion fluoride sensing electrode
(Cat. No. 100049). Refer to
Chapter II, Installing a New Calcium
Electrode
for step-by-step instructions.
3. Replace the calibration solutions (Cat. No. 182040).
Dispose of all old solutions according to the MSDS instruction. MSDS
files can be downloaded at www.thermo.com/processwater.
Valve Stem O-rings
1. Remove the two screws that hold the valve stem assembly in place.
2. Gently pull on the valve stem to remove.
3. Slide off the two old O-rings and replace them. It is not necessary to
remove the retaining ring.
4. Place the assembly back into the manifold block and tighten screws.
Note:
Do not use O-ring grease.
Manifold Face O-rings
1. Remove the reagent bottle assembly.
2. Remove the three O-rings from the face of the flow cell manifold.
3. Insert the new O-rings.
Reagent Bottle Assembly O-ring
1. When the reagent bottle is removed, replace the O-ring between the
bottle and adaptor.
Figure V-2
Flow Cell Assembly
manifold
face
valve stem
O-rings (2)
retaining ring
valve stem
Diverter Valve O-rings
