GE Analytical Instruments ©2006 13-17 DLM 14291 Rev. A
nut and tubing from the outlet of the filter. Remove the cap on the Luer
port and use a syringe (10 – 50 cc) with a Luer adapter to draw the liquid
out of the filter.
• Use a wash bottle filled with water to rinse the filter by squirting water in
the port where the tubing is connected, letting the water flow out the Luer
port.
• After rinsing, use the syringe to remove the remaining liquid.
• Repeat the rinsing and withdrawal of liquid until the filter is clean
• Allow the filter to dry before reinstalling the filter in the NOA.
• After drying, reconnect the tubing to the filter and replace the Luer cap.
• Make sure the inlet side of the filter (the side with two ports) is connected
to the tubing coming from the purge vessel.
It is strongly recommended to have a supply of replacement filters.
Replacement filters are available from Sievers (AFL 01400) and also available
from most laboratory supply houses. Two styles of IFD filters are sold by the
supply houses, the polypropylene filter used in the NOA and a nylon filter.
Always use the polypropylene filter with the NOA.
Long-term maintenance of the purge vessel and bubbler
Cleaning the purge vessel and bubbler after use will help to prevent clogging of
the frits or contamination of the glassware. Periodically, it is a good idea to
clean the glassware thoroughly in a laboratory detergent to remove any
material that cannot be rinsed from the purge vessel. Turn off the inert gas
supply and remove the 1/4" to 1/8" reducing unions on the gas inlet and the
outlet of the purge vessel. Remove the needle valve from the purge vessel and
the three stopcocks. Remove the stopcock and Teflon sleeve from the bubbler.
Soak the purge vessel, bubbler, needle valves and stopcocks in warm detergent
for several hours. Use an ultrasonic cleaner to assist in cleaning. Rinse the
items thoroughly in deionized water and allow to air dry before re-assembling
the purge vessel and bubbler.
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