Architecture

The system consists of a single 1” (2.54 cm) wide board mounted in a ruggedized rack designed for European style cabinets.

Two rack widths are available:

a. 19-inch with 17 card slots for up to 16 channel control cards and one engineering card.

b. Half 19 inches with 9 card slots for up to 8 channel control cards and 1 engineering card.

Each subrack contains one engineering card and one DC input card to form the rack system.

The system is designed to accommodate different customer wiring configurations, and for this reason,

the control functions are separated from the relays and field wiring connections.

Therefore, single channel gas detection consists of :

a. Sensor Driver Module

For compatibility with a wide range of input and sensor types,

the circuitry required to control the sensors is mounted on separate plug-in sensor driver modules.

These modules plug directly into the channel control card and are factory installed.

Two different modules are available, one for catalytic inputs and the other for 4 – 20mA inputs.

b. Single Channel Control Cards

Each single-channel control card is self-contained and contains all the necessary electronic circuitry to provide sensor actuation, 

alarm detection, and gas level indication for that gas detection channel.

c. Field Interface or Relay Card

Field interface/relay cards provide interface connections between the control card and the respective field-connected gas sensors.

In addition, relay cards provide alarm outputs for field connections.