AirTest CN9000 Series Manual

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AirTest Model CN9000 Series Sensor Controller

THEORY OF OPERATION

A basi c CN9000 configuration consists of Input/Process/Display combination modules, a 3 relay output module,

a 12 slot interconnect board, and a power supply sized to system requirements. Refer to color image for

component identification.

INPUT MODULE

An input module provides a connection for a sensors data signal and power requirements. Circuitry is provided

to condition the sensor signal for processing.

An input module can have any one of a vari e ty of input

specificati o ns to accommodate any sensor signal output type incl u ding temperature, pressure etc.

These

signals are then output to other modules via the interconnect board. Because power requirements between

sensors can also vary, input modules can be configured to supply virtually any low voltage power source.

Custom input modules may interface with override switches or keypads.

The basi c input module has connections for 4-20mA input signal using a 100 ohm current sensing load, 12 volt

DC sensor power source and an AC power source (optional).

PROCESS MODULE

A process module can input signals on the interconnect board and perform some form of anal y sis or further

conditioning to the signal and in turn generate and direct an output signal back to the interconnect board to be

used by other modules. Processing can include generation of signals to trip relays, turn on status LED' s or

display comprehensi v e alphanumeri c data on an LCD panel. The basic process module is part of the basi c input

module.

DISPLAY MODULE

A display module can take many forms with the common theme of providing visual information, the most

common being simple LED's.

OUTPUT MODULE

An output module inputs signals from the interconnect board and directs them to output devi c es as required by

the end user. An output module can provide the end user with a simple contact closure or a complex data

stream that can be used by a building management system. The AirTest CN9000 controller is also not limi t ed by

the number and output types per system configuration. Typi c al output modules provide one or more dry contact

relays, LED contact closure indi c ators and wiri n g terminals.

FEATURE MODULE

Feature modules allow intermediate logic processing of system si g nals. These signal s can be any combination

of i n puts from the interconnect board or onboard user wiring terminals. Processed signals can then be output to

the interconnect board for use by other modules and/or to user wiring terminals for connection to external

devi c es.

One example would be a module that processes a high gas concentration l e vel from an input/process module

and makes a dry contact relay closure to power a horn. If a push button is pressed (input through wiring

terminals) the horn is silenced for a user selectable time period.

INTERCONNECT BOARD

This board provides a connection path between modules as well a power. The base interconnect board allows

connection for up to 12 modules of any type. Multiple interconnect boards can be wi r ed together to expand the

system beyond 12 modules.

Distributed By:

GLOBAL CONTROLS, INC.

3008-B 16TH AVE W.

SEATTLE, WA 98119

(800) 821-4863 TOLL FREE

(206) 282-4666 TEL

(206) 282-4888 FAX