IONIZATION SMOKE DETECTORS

TM 55-1925-292-14&P

0002 00

IONIZATION SMOKE DETECTORS

The smoke detectors are part of the fire alarm system. There are 15 24-volt ionization smoke detectors in

various locations throughout the vessel. The ionization smoke detector's contacts close when smoke is de-

tected. When the contacts are closed, the fire and smoke detection panel in the EOS detects the condition and

sounds the alarm.

The technical characteristics of the smoke detectors are contained in table 3.

Table 3. Smoke Detectors Technical Characteristics

Item

Data

Manufacturer .............................................................................................................. Pyrotronics

Model ..................................................................................................................................... DI-3

Series ................................................................................................................................... 6119

Type ..................................................................................... Adjustable Sensitivity/Dual Chamber

Operating Temperature .................................................................... 32 F (0 C) 100 F (38 C)

Voltage ............................................................................................................................... 24 Vdc

Amps ..................................................................................................................................... 80 A

THERMAL HEAT DETECTORS

There are three thermal heat detectors in the fire alarm system. One each is located in the EDG room, the galley,

and the crew's mess/recreation area. The thermal heat detectors are similar to the ionization smoke detectors

except the contacts close when a temperature of 135 F (55.2 C) is sensed.

The technical characteristics of the thermal heat detectors are contained in table 4.

Table 4. Thermal Heat Detectors Technical Characteristics

Item

Data

Manufacturer .............................................................................................................. Pyrotronics

Model .......................................................................................................................... DT-135WP

Type ........................................................................................................................ Weatherproof

Temperature Set Point ........................................................................................ 135 F (57.2 C)

Voltage ............................................................................................................................... 24 Vdc

Amps ....................................................................................................................................... 1 A

BEACON

The fire alarm system beacon (red) is located in the radio room. The beacon provides a visual indication of a fire

alarm condition.

The technical characteristics of the beacon are contained in table 5.

Table 5. Beacon Technical Characteristics

Item

Data

Manufacturer ................................................................................................ Revere Plastics, Inc.

Type ................................................................................................................... Beacon, Rotating

Voltage .............................................................................................................................. 115 Vac

24 Vdc

0002 00-23