Emerson Rosemount CCO 5500, Reference Manual

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Prerequisites
Note
Place the check cell at the receiver side.
Measurement conditions
For absolute verification, you must check the instrument when no measurement gas is
present. If a background concentration of measurement gas is present, an increase will still
be generated, but the net effect will be complex.
Mode 6
The ideal time to perform a check cell test is with the plant off, auto zero condition on, and
the analyzer well stabilized at zero. Do not insert the check cell in any other mode than
Mode
6 .
The analyzer does not update rolling averages while in Mode 6 .
Procedure
1. Enter Mode 6 on the control unit before inserting the check cell into the analyzer.
Press ENTER when Mode 6 is displayed.
2. Use an arrow key to toggle from
NO
to
YES
and press ENTER to access the check cell
function.
If you don't select this within five seconds, the instrument returns to the normal
OPERATING mode.
3. When you see this option, insert the check cell observing the procedure outlined
below.
4. Remove the two screws retaining the cover on the check cell holder ( Figure 4-4 ).
Operation
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