Maintaining The Burette Parts - Mettler Toledo DV1001 Manual De Instrucciones

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Maintaining the burette parts

Depending on the titrant, you should clean the burette cylinder, piston, stopcock and tubing relatively often.
– Slide the burette off the titrator, invert it so that the stopcock points towards you and carefully take out the
piston; this causes the burette contents to flow out through the suction tubing (waste or titrant bottle!).
– In the same position, turn the stopcock through 90° clockwise and any liquid in the stopcock will flow
out through the dispensing tubing (waste bottle!).
– Unscrew the suction, dispensing and connection tubing.
5, 10, or 20 mL burette
– Unscrew the locking screw of the burette and take out the glass cylinder.
Caution: Do not misplace the centering ring of the burette housing!
1 mL burette
– Unscrew the knurled screw of the burette and remove the O-ring from the glass cylinder using tweezers.
– Unscrew the holder of the glass cylinder and take out the cylinder.
Caution: Do not misplace O-ring!
– Press the cam of the stopcock inward
and lift the stopcock up and out.
• Depending on the contamination caused by the titrant, rinse cylinder and tubing with acids or deion-
ized H O then with ethanol and finally dry the parts with oil-free compressed air or vacuum.
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• Rinse the stopcock with solvents or deionized H
• Never place O-rings in organic solvents!
• Never attempt to remove any crystals in the cylinder by scratching with a hard object! Pipe cleaners or
Q tips™ are more suitable.
• Never put the parts in a drying oven whose temperature is above 40 °C!
– Replace the piston if it leaks or is badly scored at the edge. Pay special attention to crystal formation
between the lip seals of the piston if you work with NaOH/KOH and KF solutions!
METTLER TOLEDO DV1001/1005/1010/1020
Cam
O only! Then dry it with oil-free com-pressed air.
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Interchangeable burettes
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