HF scientific MicroTSCM Streaming Current Monitor - Manual (Page 23)

MICROTSCM (07/09) Page 19
REV 2.4
9.0 Routine Maintenance
The most important maintenance procedure is to keep the sensor clean. The need for
cleaning is indicated when normal readings cannot be maintained. As a preventative
measure, cleaning intervals of 30 days or less is recommended. There are two
recommended cleaning methods.
9.1 Preferred Method – Chemical Cleaning
Pour the SCM-1 cleaning solution (Catalog # 19402) into a suitable container, large
enough to immerse the lower 1/2 of the probe body. Run the sensor in this solution for
approximately 10 minutes. Then run the instrument for about 10 minutes in clean water.
For organic debris, replace the cleaning solution with a 5% chlorine solution.
Please refer to the Material Safety Data Sheet for proper handling of the SCM-1 cleaning
solution.
9.2 Manual Cleaning
In extreme conditions, the cell will have to be removed and cleaned with an abrasive
cleaning pad such as Scotch-Brite® and a small brush.
Always rinse the probe out with clean water prior to starting.
1. To expose the cell and probe area, remove the bottom cap by turning it CCW (as
viewed from the bottom). Be careful to retain o-rings and seals.
2. Carefully pull the Cell out of the probe end, about 25-50 mm (1-2 inches)
3. Clean the inside of the cell with a stiff toothbrush and an abrasive pad such as
(Scotch-Brite®). The aim is to remove all debris and polish all stainless steel
surfaces.
4. Rinse the cell with water.
5. Loosen the shaft-retaining nut with a 10mm wrench and from the bottom of the
sensor unscrew the probe.
6. Completely remove the nut then pull the probe out.
7. Polish the probe with the abrasive pad.
8. Reinstall the probe, adjusting the probe such that it misses the bottom of the cell by
1-2 mm, then snug the 10mm retaining nut. DO NOT OVER-TIGHTEN.
9. Completely dry off any water that is in and around the cell cap, the bottom of the
cell and the O-rings and seals.
10. Reassemble the lower seals and install the cap very firmly by hand.
11. Rotate the motor slowly by hand to ensure the probe does not hit the cell bottom. If
there appears to be any contact adjust the probe up slightly.
12. If the probe does not rotate freely inside the cell, check for obstructions. This
condition will cause premature motor wear.