Emerson Rosemount CX1100, Справочное руководство, Страница: 21 / 48

3 Wire
All wiring must conform to local and national codes.
WARNING!
Before installing the equipment, read the Safety Instructions at the front of this manual. Failure
to follow safety instructions could result in serious injury or death.
NOTICE
To maintain proper earth grounding, ensure a positive connection exists between the probe
terminations housing and earth. The connecting wire must be 14 AWG minimum.
NOTICE
Line voltage, signal, and relay wiring must be rated for at least 221 °F (105 °C).
NOTICE
If metal conduit is used with the Rosemount
™
CX1100 Remote Transmitter, reliably bond the
conduit to protective earth. The grounding plate inside the Rosemount CX1100 Remote
Transmitter is not bonded to PE and does not provide adequate grounding.
3.1 Installation specifications - interconnect cable
Customer supplied cable up to 200 ft. (60 m) long, rated for -40 to 194 °F (-40 to 90 °C)
and voltage 300 VACrms.
Heater power: 3 multi conductor 18ga shielded cable to connect the heater control signal
Probe sensing: 3 twisted pair conductors 22ga overall shielded cable to connect the TC,
O
2
, and CJC signals.
Cable may be purchased as two separate cables.
3.2 Connect the cables
Raw voltages from the oxygen sensor and heater thermocouple are transmitted from the
Rosemount CX1100 Probe to the Rosemount CX1100 Remote Transmitter. The remote
transmitter also controls power to the probe heater in order to maintain the correct sensor
temperature.
This arrangement calls for interconnect wiring consisting of nine conductors. Given the
recommended wire specifications, the maximum length for this cable is 200 ft (60 m)
(refer to
Section 3.1 ).
Wire
Reference Manual 15