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Instruction Manual
IM-106-5500, Original Issue
August 2005
4-21
CCO 5500
The check cell must not be inserted before this
screen is accessed. Refer to Notes for Using a
Rosemount Analytical Check Cell.
NORMAL SHUTDOWN
PROCEDURE
The system should not need shutting down unless maintenance is being
carried out. In this case, power down the power supply (and thus the signal
processor and analyzer heads). Close the manually operated isolating valves
on the analyzer heads and proceed with service. When satisfactorily
completed, open the valves and power up the system. The system may need
a calibration performed, depending on the type of maintenance carried out.
For details refer to Section 6, Troubleshooting.
ROUTINE CHECKS
Notes for Using a
Rosemount Analytical
Check Cell
The check cell and holder are optional items available from Rosemount
Analytical. The Rosemount Analytical check cell has been designed to verify
the reading of Rosemount Analytical cross duct analyzers. When placed
within the measurement path a known increase in gas concentration can be
generated.
NOTE
The check cell should be placed at the receiver side.
Measurement Conditions
For absolute verification it is necessary to conduct a check on the instrument
when there is no measurement gas 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
This mode of the analyzer is used in conjunction with a check cell to verify the
calibration and operation of the monitor.
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 rolling averages of the analyzer will not update during use of Mode 6 - to
prevent false readings being recorded - the check cell mode cannot be
operated from the IEM system.
Check Cell Procedure
1. Enter Mode 6 on the signal processor 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 this is not selected within 5 seconds the
instrument returns to the normal operating mode.
3. When this screen is seen the check cell
must be inserted observing the procedure
outlined below.
4. Remove the two screws retaining the
cover on the check cell holder (Figure 4-5).
6 CO = 0060ppm
CO = 0121ppm.m
6 Ch’k Cell Mode
YES