CODEL Energy Tech 401 Installation, Operation And Maintenance Manual page 103

5.13
5.13.1 Notes for Using
a CODEL Check Cell
the check cell should be placed at the receiver side.
5.13.1.1 Measurement
Conditions
5.13.1.2 Mode 6
5.13.1.3 Check Cell Procedure
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Issue: A Revision: 1 Date: 24/07/19
Routine Checks
The check cell and holder are optional items available from CODEL. The CODEL
check cell has been designed to verify the reading of CODEL cross duct
analysers. When placed within the measurement path a known increase in gas
concentration can be generated.
NOTE
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 analyser is used in conjunction with a check cell to verify the
calibration and operation of the monitor. There are two values shown in this
mode. The first is ppm.m (standard), the second is ppm.m divided by the path
length as programmed in the SPU. The value written on Check cells is the ppm.m
(standard).
The ideal time to perform a check cell test is with the plant off, auto zero
condition on and the analyser well stabilised at zero. Do not insert the check cell
in any other mode than Mode 6.
The rolling averages of the analyser 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.
Enter Mode 6 on the signal processor before inserting the check cell into the
analyser. Press enter when Mode 6 is displayed.
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.
When the screen above is seen the check cell must be inserted observing the
procedure outlined below.
Ref: 100606
Section 5
Normal Operation
Page: 103