Emerson Rosemount 6888A, Reference Manual

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3 Configuration, startup, and operation
WARNING!
ELECTRIC SHOCK
Install all protective equipment covers and safety ground leads before equipment startup.
Failure to install covers and ground leads could result in serious injury or death.
CAUTION!
EQUIPMENT DAMAGE
If external loop power is used, the power supply must be a safety extra low voltage (SELV)
type.
3.1 Power up Rosemount 6888 Transmitter
without Rosemount 6888Xi
Complete the following steps to apply power to the Rosemount 6888 Transmitter without
connecting it to the Rosemount 6888Xi.
1.
Apply AC line power to the transmitter.
2. Apply 24 Vdc loop power to the transmitter.
3. Using either the DCS control or a Field Communicator, verify communications to the
transmitter.
The transmitter probe takes approximately 45 minutes to warm up to the 736 °C
(1357 °F) heater setpoint. The 4-20 mA signal remains at a default value of 3.5 mA,
and the O
2
reading remains at 0% through this warm-up period. After warm-up, the
probe begins reading oxygen, and the 4-20 mA output is based on the default range
of 0-10% O
2
.
If there is an error condition at startup, an alarm message is displayed.
Configuration, startup, and operation
Reference Manual 47