Emerson IM-106-5500 Manual Do Utilizador

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. 

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. 

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.

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. 

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. 

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).