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8.3.2 How to dry the cell
Preparation : a set of simple equipment is necessary as follows:
Air pump
: Air discharge rate 1 to 2L/min
(a pump for tropical fish can be used)
Desiccant tube
: silica gel
5 to 10g in tube
Connect the above to DA-130N as illustrated below:
Empty container
Air pump
Desiccant tube
For 4mm tubes of inside diameter
(1)
Thoroughly clean the measuring cell with pure water.
(2)
Clean with ethyl alcohol.
(Ethyl alcohol gets rid of dirt which cannot be removed with pure water, and hastens dry
cleaning. If ethanol is unavailable, clean the cell thoroughly)
(3)
Purge air to dry the cell thoroughly and completely.
(4)
When the measuring cell is cleaned routinely:
Only cleaning with pure water
: ca. 5 to 10 minutes to complete drying
Additional cleaning with ethanol
: ca. 3 to 5 minutes to complete drying
(5)
Once purging air is stopped, leave the cell for more than 30 minutes.
(Calibrating before the cell temperature equilibrates with room temperature will result in
failure)