Thermo Scientific 2112 Series Operating Manual And Parts List page 28

Disassembly for
Cleaning (continued)
Thermo Scientific
5. Disassemble the drain line and clean as required. Ensure that the drain
line is clear (including the drain opening in the evaporator) before
using detergent or acid cleaners. Reassemble the drain line.
6. Soft scale may be removed as described under "Soft Scale Removal."
Silica scale may be removed as described under "Silica Scale Removal."
To remove hard scale or organic scale, fill the evaporator with
concentrated acid (see "Hard Scale Removal") or detergent solution
(see "Organic Scale and Sludge Removal") or detergent solution (see
"Organic Scale and Sludge Removal") as required.
7. Inspect the constant level device and drain line. Clean as required.
8. If the still is equipped with a gauge glass, remove and clean the gauge
glass cocks and gauge glass:
a. Unscrew the nuts that hold the gauge glass in place.
b. Lift the gauge glass up into the top gauge glass cock about 1/2
inch.
c. After the bottom of the gauge glass is clear of the bottom gauge
glass cock, move it away from the still and remove it from the
upper gauge glass cock.
d. Remove and clean the gauge glass cocks and clean the gauge glass.
9. Reassemble the still. Assembly is essentially the reverse of disassembly.
10. Connect the water, waste and distillate lines.
11. Start the still as described under "Initial Startup."
12. Lower the cooling water flow rate (with the cooling water throttling
valve) until steam spouts out of the condenser vent at least 12 inches.
Operate in this manner for 30-60 minutes to sterilize and clean out the
still.
Caution Ventilate the room during this operation.
13. Adjust the still as described in "Initial Operation."
Section 6
Maintenance and Servicing
s
Classic Elec Heated Stills 6-3