Emerson Rosemount 6888A, Reference Manual

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CAUTION!
This variable insertion mount is intended for use in negative pressure ducts and postive
pressure ducts where the flue gas pressure is no more than 1 psi. Emerson offers other systems
with isolation valve and pressure balancing for applications where the pressure is up to 50 psi.
2.3 Electrical installation
All wiring must conform to local and national codes. Multiple wiring diagrams are shown in
this section. Always refer to the diagrams that apply to your transmitter configuration and
disregard all other wiring diagrams.
WARNING!
ELECTRIC SHOCK
Disconnect and lock out power before connecting the power supply.
Install all protective covers and safety ground leads after installation. Failure to install covers
and ground leads could result in serious injury or death.
To meet the safety requirements of IEC 61010-1 (EC requirement) and ensure safe operation of
this equipment, connect the main electrical power supply through a circuit breaker (min 10 A)
which will disconnect all current-carrying conductors during a fault situation. This circuit
breaker should also include a mechanically operated isolating switch. If not, keep another
external means of disconnecting the supply from the equipment located close by. Circuit
breakers or switches must comply with a recognized standard such as IEC 947.
NOTICE
To maintain proper earth grounding, ensure a positive connection exists between the
transmitter housing and earth. The connecting ground wire must be 14 AWG minimum.
NOTICE
Line voltage, signal, and relay wiring should be rated for at least 105 °C (221 °F).
2.3.1 Wiring for Rosemount 6888 Transmitter probe only (no
Rosemount 6888Xi Electronics)
The Rosemount 6888 transmitter probe has electronics in the blue housing that controls
the heater temperature and also amplifies the raw O
2
millivolt signal to a linear 4-20 mA.
The 4-20 mA signal lines can be run directly to the control room and also power the
transmitter electronics. There is no O
2
display or keypad on the probe, so you must set up
through HART
®
communications via a 475 handheld communicator or via Asset
Management Solutions (AMS).
1.
Remove the cover from the probe.
2. Connect the line (L1 wire) to the L1 terminal, the netural (L2 wire) to the L2/N
terminal, and the ground wire to the ground lug.
Install
26 Rosemount 6888A