2. CONSTRUCTION
The system consists of individual1'' (2.54cm)wide cards tted toa
rigidcustomrackdesignedtotEurorackcabinets.Tworackwidths
are available:
a. 19 inch with 17 card slots to house up to 16 Four Channel Control
Cards and an Engineering Card.
b. Half 19 inch with nine card slots to house up to eight Four Channel
Control Cards and an Engineering Card.
Each sub-rack contains an Engineering Card and a DC Input Card to
make up the rack system
The system is designed to meet the differing customer wiring
congurationsandtoachievethisthecontrolfunctionsaresplitaway
from the relays and eld wiring connections. Four channels of gas
detection therefore consists of:
a. Four Channel Control Card
Each Four Channel Control Card functions independently and
contains all the necessary electronic circuitry to provide the sensor
drive, alarm detection and gas level display for four channels of gas
detection.
There are two types of Four Channel Control Cards, one for catalytic
inputs and the other for 4 - 20mA inputs.
b. Quad Relay Interface Card
The Quad Relay Interface Card provides the interface connections
betweentheControlCardandtherespectiveeldconnectedgas
sensors. In addition, it provides four alarm outputs via the eld
connections.
c. Relay Interface Assembly
Where additional relay contacts are required, an Expansion Relay
Card is attached to the Quad Relay Interface Card. The new
assembly becomes the Relay Interface Assembly and expands the
alarm relays to 16. This combination occupies two interface card
slots and as a consequence limits the number of control cards that
canbettedtotherack.
CHAPTER 1 - SYSTEM CONCEPT
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