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 TB 740-97-4
feet from Intake end of the moist air return ducts. Instruments will be mounted so that they are protected against movement or
damage. Rubber covered electrical cable, with suitable terminal connectors, will be installed to connect the humidistats to the
dehumidification machines and to the power lines. The manufacturer's instructions will be followed in making the electrical
connections. Provisions will be made to prevent movement of the cables at the points where they leave the dehumidified zones.
(f). Sensing elements. Three humidity sensing elements, with 6 foot cables, will be installed in the main dehumidification
system, one each in the control room, the fresh water tank, and the after chain locker. Two humidity sensing elements, without cable,
will be Installed, one each for the crane cab and the aft deckhouse. The sensing elements, with cable, will extend downward into the
dehumidified area as far as the cable permits. They will be secured against movement and against contact with metal or other
conducting surfaces. The sensing element contacts will be installed as follows:
1. Control room. The sensing element contact will be installed In a blank placed In the after portlight on the starboard side.
The blank will be fabricated from 1/2-inch-thick exterior grade I plywood or No. 20 gage galvanized sheet metal.
2. Fresh water tank. The sensing element contact will be mounted in a blank sealed to the top of the filling pipe.
3. Aft chain locker. The sensing element contact will be installed In the blank used to seal the aft chain pipe opening.
4. Crane cab and aft deckhouse. The sensing elements for these spaces will be mounted in the blanks provided for
entrance of the dehumidification air ducts.
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