Channel Master CM-5020 Specifications download pdf (Page 41)

Channel Master Operation Manual

P/N 95B-6001-00 (February 2006) page 33

8.7 Desiccant Bags

Desiccant bags are used to dehumidify the housing interior. Desiccant is

essential in deployments with plastic housings. The factory-supplied desic-

cant lasts a year at specified Channel Master deployment depths and tem-

peratures. Remember that desiccant rapidly absorbs moisture from normal

room air.

The average dry weight of a new desiccant bag is 7.2 grams ((5%). The

weight increases to 8.4 to 9 grams for a “used” desiccant bag. Used desic-

cant bags may be dried at 250° for 14 hours. As a minimum, replace the

desiccant bags whenever you are preparing to deploy or store the Channel

Master for an extended time.

CAUTION. Do not open the desiccant bag. Contact with the silica gel can

cause nose, throat, and skin irritation.

NOTE. Desiccant bags are shipped in an airtight aluminum bag to ensure

maximum effectiveness. There is a moisture indicator inside the bag. If

the moisture indicator is pink, do not use the desiccant bag until it has

been dried. RDI recommends replacing the desiccant bag just before the

deployment.

a. Remove the housing (see “Housing Assembly Removal,” page 22).

b. Remove the new desiccant bags from the airtight aluminum bag.

c. Remove the old desiccant bags and install two new ones. Place the des-

iccant bags between the top circuit board and the housing.

d. Install the housing (see “Housing Assembly Replacement,” page 26).

8.8 Sealing the Channel Master for a Deployment

Use Figure 16, page 24 and the following steps to seal the Channel Master

for a deployment.

a. Check the Channel Master electronics; there should be no loose screws

or missing hardware.

b. Add two fresh desiccant bags inside the Channel Master housing (see

“Desiccant Bags,” page 33).

c. Install the housing assembly (see “Channel Master Re-assembly,” page

25).

d. The Channel Master is now ready for deployment unless you want to

take steps to prevent biofouling (see “Prevention of Biofouling,” page

34).

e. Test the Channel Master before the deployment.

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Channel Master CM-5020 Specifications Page 41