Emerson Rosemount CCO 5500, Reference Manual

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You can do this test with the plant on line, but any pollutant gas present (it will probably be
residing at a different temperature) will interfere with the check cell value.
Note
Do not insert the check cell in any other mode as this will influence the recorded rolling averages.
Rosemount fixes the calibration of the Rosemount CCO 5500 Analyzer at the point of
manufacture. If gross errors exist, this could suggest an instrument malfunction. If you
observe minor errors, please check the procedure and if necessary, return the gas cell for
recertification.
4.13.2 Alarms and emergency conditions
The alarm thresholds for the system are set as described in the normal OPERATING mode.
When an alarm condition occurs, the red LED on the control unit lights up. This goes out
when the alarm condition has cleared. When the condition has cleared, the software
records the fact that an alarm condition occurred. The 4 to 20 mA output from the
analyzer will also alter according to the pollution levels detected.
4.13.3 Emergency shutdown procedure
This is the same as normal shutdown.
1.
Remove power from the power supply.
The whole system closes down.
2. Close the isolating valves if required and stop the flow of air to the air purges.
4.13.4 Isolation procedure
Complete the following steps to isolate the analyzer.
1.
Shut down power to the power supply.
2. Shut off compressed air to the air purges and close the isolating valves.
Operation
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