Lectrosonics WM - Manual User Manual download pdf (Page 18)

LECTROSONICS, INC.

Desiccant Battery Caps

Early WM transmitters were shipped with standard

battery caps. Later engineering developed an updated

battery cap design that contained moisture absorbing

desiccant beads to protect the interior of the transmit-

ter from excess humidity. These caps are available as

a kit to update early WM transmitters, or to replace lost

or damaged caps.

Beads are stored

inside the cap to

absorb moisture

through the vent

holes.

Beads are amber/orange

in color when able to

absorb moisture.

These battery doors on the WM will absorb small

amounts of moisture and humidity from the inside of

the transmitter. You must still be careful to keep mois-

ture out of the WM by opening it only in dry or shel-

tered areas and by making sure the battery surfaces

are dry before installing them. Always use the WP wa-

terproof mic connector in wet conditions. The desiccant

doors will only remove a few drops of moisture.

Kit consists of pre-assembled

battery doors with thumbscrew

and hex key (Allen wrench)

Remove center screw using the supplied allen wrench.

Install new battery caps and tighten the thumb screw

by hand. The thumbscrew is removed to recondition

(dry out) the desiccant beads.

Eventually, the desiccant beads absorb enough mois-

ture that they will become ineffective and turn green

or blue instead of the normally dry color of amber/

orange. To recharge the desiccant, it must be heated

to 200 to 400 degrees F for at least an hour, preferably

more. The desiccant, the silicone O-ring seals and the

doors can withstand maximum temperatures up to 400

degrees F (205 degrees C).

To easily dry the desiccant doors in an oven, separate

the doors from the case by removing the center thumb-

screw. All the parts will be remain fastened to one

another by the cable between them. The doors can

then be put into an oven at 200 degrees F for several

hours. As the heat drives out the absorbed moisture,

the desiccant will turn back to its normal amber/orange

color.

Do not put the WM transmitter itself into any

oven or heating device.

After heating, particularly at higher temperatures, the

O-rings may need a tiny dab of petroleum jelly (Vase-

line) to replace the lubricant that may migrate in the

heat.

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