12. SENSOR CONNECTIONS
12.1 General
WARNING
Incorrect connection of the sensor wires may cause damage to
both the sensor and System 57.
CAUTION
The sensors connections must always be made with the System
57 unit in an unpowered state. Isolate power supplies at their
source before making connections.
Ensure that any external dc backup battery supply is also
disabled.
IMPORTANT
In order to ensure the correct operation of the system and to meet
European Standards for RFI and EMC, all sensor eld cables
must be screened. The cable screen of each sensor should be
connected to the cabinet protective earth.
Connect the cabling to sensors in accordance with the Sensor Operating
InstructionsandruntheeldcablesbacktotheSystem57unit.The
sensor cables should be routed away from sources of interference such
as ac power cables, motors, machinery etc.
Usetheinformationonthecongurationsheetprovidedwiththeunitto
decide which sensor to connect to each channel. The following sections
describe the sensor connections for the Catalytic and 4 - 20mA input
Four Channel Control Cards.
12.2 Catalytic Sensor Connections
Catalytic sensors require a three wire connection and the sensor
documentation will indicate three connections S, 01 and NS, which are
usually brown, white and blue respectively.
AttheSystem57endoftheeldcable,thethreesensorwiresshould
each be connected to the respective matching S, 01 or NS terminal
of the appropriate channel on the Quad Relay Interface Card that is
attached to the required Four Channel Control Card.
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