AirTest CN9000 Series Manual - Page 7

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AirTest Model CN9000 Feature Module

This custom feature module incorporates a timing circuit, output relays and external input/output

wiring terminal block.

Silence Timing Circuit

When the front panel pushbutton marked "Silence" is pressed the timer circuit silences the

audible horn for a period determined by the position of trim pot (1). After the time period expires

the audible circuit alarm will be enabled if the system detects a gas level above the Relay Trip

Point (RTP). The timer is adjustable from 0 to approximately 20 minutes. The image below

shows the trim pot set to offer a silence period of approximately 12 minutes.

LED

(2)

is illuminated during the silence period.

Terminal block

(3)

is custom wired and should not be modified unless instructed by AirTest or it's

an authorized representative.

The 2 header pins

(4)

are connected to the front panel push button via an IDC plug.

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