Ionization Type Smoke Sensors

entrance of insects or airborne materials. The screen shall not

inhibit the movement of smoke particles into the chamber.

d.

Provide twist lock bases for the sensors. The sensors shall

maintain contact with their bases without the use of springs.

Provide companion mounting base with screw terminals for each

conductor. Terminate field wiring on the screw terminals. The

sensor shall have a visual indicator to show actuation.

e.

The sensor address shall identify the particular unit, its

location within the system, and its sensitivity setting. Sensors

shall be of the low voltage type rated for use on a 24 VDC system.

f.

An operator at the control panel, having a proper access level,

shall have the capability to manually access the following

information for each initiating device.

(1)

Primary status

(2)

Device type

(3)

Present average value

(4)

Present sensitivity selected

(5)

Sensor range (normal, dirty, etc.)

[2.2.6.2

Ionization Type Smoke Sensors

Provide addressable ionization type smoke sensors as follows:

a.

Provide analog smoke sensors which operate on the ionization

principle and are actuated by the presence of visible or invisible

products of combustion. Smoke sensors shall be listed for use

with the fire alarm control panel.

b.

Provide self-restoring type sensors which do not require any

readjustment after actuation at the FACP to restore them to normal

operation. Sensors shall be UL listed as smoke-automatic fire

sensors.

c.

Components shall be rust and corrosion resistant. Vibration shall

have no effect on the sensor's operation. Protect the detection

chamber with a fine mesh metallic screen which prevents the