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Maintenance
Changing the Desiccant
The desiccant chamber is located in-line between the regulator tee assembly and the nitrogen tank. Change
the desiccant whenever the blue indicator starts to turn pink. Refer to Figure 7-3 and follow the directions
below to change the desiccant:
Warning!
The desiccant chamber contains high pressure and will cause personal injury if
the nitrogen gas supply is not turned OFF before detaching the gas lines.
1.
Turn off the nitrogen tank gas flow by turning the knob all the way clockwise.
2.
Detach the gas lines (copper tubing) from each end of the desiccant chamber.
3.
Remove the cover end of the chamber. The cover end is the end connected to the nitrogen
supply. Refer to Figure 7-3.
4.
Remove the glass wool, aluminum screen, spring and o-ring from the chamber.
5.
Empty the desiccant from the chamber.
6.
Clean the chamber thoroughly with water and let it dry.
7.
Fill the chamber slightly less than halfway with molecular sieve. (Do not use a substitute for
the molecular sieve.) Molecular sieve is available from MOCON in 2.2 kg cans.
8.
Pour one inch of blue indicator pellets into the chamber. The blue indicator pellets are
available from MOCON.
9.
Fill the chamber with molecular sieve to within one inch (2 to 3 cm) below the connector
fitting.
10.
Replace the glass wool.
11.
Replace the aluminum screen and then the spring.
12.
Lubricate the o-ring with high vacuum or silicon grease and insert it into the metal cap.
13.
Close the chamber cover tightly.
14.
Inspect the o-rings on the chamber fittings and replace them if worn or cracked.
15.
Reconnect the gas lines. Make sure to connect the tube from the nitrogen supply to the cover
end of the desiccant chamber.
16.
Turn on the nitrogen tank valve and readjust the regulator pressure, if necessary.
7-6
Revision G
AQUATRAN 3/38 Operator's Manual
MOCON, Inc.
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