FED-STD-228A
3.1.6 A fresh water spray nozzle mounted inside the cylindrical drum in such a position that each
specimen will be exposed to a complete wetting throughout its length one time during each revolution of
the framework. Each nozzle shall be adjusted so as not to strike the Corex D filters and to deliver
between 1 ½ and 2 gallons of water per hour. The water shall be maintained between 10° and 25°C (50°
and 77°F) during the test.
3.25"
.75"
.30"
.25"
1.625"
.30"
1.5"
3.25"
.325"
.25"
.25"
.25"
NOTE: PITCH OF
SCREW 28 THREADS
.75"
6.0"
PER INCH
.20"
4.0"
.75"
.75"
.375"
.25"
2.55"
3.25"
.25"
NOTE: SCREW TO
TURN FREELY IN
FIXED BAR
.20"
.375"
2.20"
FIGURE 4131A. Rubber holder for light aging. All parts except rods to be made of aluminum. Rods to
be made of monel.
3.1.7 An exhaust fan, for effectively ventilating the arc, with a capacity of 100 ± 20 cubic feet per minute.
3.1.8 A thermometer for determining the temperature of the air at the position of the specimen in the
drum. The bulb of the thermometer shall be shielded by a cylinder of bright metal foil 2 inches in diameter
and 2 inches in length.
3.1.9 A suitable framework, complete with cables, pulleys, and counterweights for raising the lamp for
inspection and replacement of carbons.
3.1.10 Electrical control equipment for automatic operation of the entire unit and maintaining the current
of the arc approximately constant. The equipment shall include a constant voltage regulator to maintain
the input voltage at 220 ± 1 volt. It shall also contain a push-button station for starting and stopping the
unit, interlocked with the main line contractor to insure complete electrical isolation of the arc equipment
when changing carbons or working on the interior mechanism of the lamp.
132
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