1. Remove the sample line quick-disconnect fitting at the inlet port (bottom)
of the NEMA enclosure. Leave the quick-disconnect connected at the top.
2. Insert the cleaning brush up through the bottom flow path as shown
in Figure 18. Use a gentle laboratory cleaning solution to enhance the
cleaning and lubricate the brush/cell. Gently insert the brush and twirl
it as it is being inserted into the bottom fitting. It will bottom out to a stop.
Repeat several times, then reconnect the inlet flow connector to flush
3. Observe the Calibration Fail indicator. The indicator should go off within a
4. If the Calibration Fail indicator remains on, perform the stain cleaning
For red mineral deposits (iron, etc.), flush cell with an iron reducing agent Like RoVer®, and then flush cell with water.
For calcium (white) deposits, flush cell with vinegar or phosphoric acid, and then flush cell with water.
For purple or black stains (manganese, etc.), flush with a solution of 1/3 water, 1/3 vinegar, and 1/3 hydrogen peroxide (3% strength), and then flush cell with water.