MANUAL NUMBER 160339
REVISION 09SEPT04 PAGE 7
OPTICAL FIRE DETECTOR
The Kidde Dual Spectrum
model PM-3M fire sensor operates by sensing two separate
bands of infrared energy. A fire signal is generated when the sensors see a fire fueled by
gasoline, diesel, CNG, LNG, LPG, methanol, oils, lubricants, and other types of hydrocarbons.
The fire sensor has a 100° solid cone field-of-view. It has a response time to explosive
fires of one half of a second maximum. The PM-3M has a detection threshold of 42 inches for
a one square foot pan fire fueled by diesel.
The fire sensor is immune to false alarms from sunlight, flashlights, lightning, vehicle
headlights, incandescent lights (100W at 2 inches), and welding arcs (30 inches).
Each fire sensor has a green status light in the center of its front surface. The status
light is illuminated when the fire sensor has electrical power. The status light will blink after the
sensor has responded to a fire. The blinking will not stop with system reset, but is cleared when
power has been cycled to the sensor. This feature can be used to help pinpoint the source of
the fire.
The temperature operating range of the fire sensor is -40°F to 257°F (-40°C to 125°C).
Input current is 5 mA quiescent.
FIGURE 3 – OPTICAL FIRE DETECTOR
To Next Page
Loading...
