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Thermo Scientific
Maintenance and Servicing
Section 8
For top performance and efficiency, the MEGA-PURE 11A water still
should be kept clean and free of scale. It is recommended that the boiler be
drained and refilled with fresh water daily to flush the boiler of the
concentration of contaminants from the previous day's run.
When using untreated boiler feed, cleaning is recommended after every
15-20 hours of operation, or when boiler scale is visible. The unit should
be cleaned with a hydrochloric acid solution. This is done as follows:
1. Push unit "OFF" switch.
2. Disconnect output tubing at condenser "F" from collection vessel and
temporarily place a beaker under condenser outlet.
3. Drain boiler by opening stopcock "K". Close stopcock "K"after boiler
has completely drained.
4. Use the spare pinch clamp from the parts box to shut off overflow tube
from constant level chamber "B" as close as possible to overflow stem.
5. Carefully pour approximately 800 ml of 10% hydrochloric acid
solution into top of constant level chamber "B".
6. Wait approximately 10 minutes or until residue disappears. If
additional cleaning is required, drain boiler down 1 inch and turn unit
on for a few minutes until residue disappears. Do not boil.
7. Carefully drain the unit, remove clamp from overflow tube and refill
with fresh water. Turn still off, drain boiler, refill with fresh water and
operate for 30 minutes. Reconnect tubing from collection vessel to
condenser "B".
Warning To avoid lung injury or suffocation, ensure adequate ventilation
when using chemicals for cleaning.
Warning Wear eye and hand protection when using acid for cleaning, as
acid spattering may occur.
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11A Water Still
8-1
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