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Emerson Process Management GmbH & Co. OHG1-20
X-STREAM XEFD
Instruction Manual
HASXEDE-IM-EX
03/2012
1.9 Vapor Recovery Application
Converter efciency
The measurement accuracy is highly depen-
dent on the converter efciency: If this is too
low, the converter material needs replace-
ment.
To measure the converter efciency, one
has to compare the measurement values of
CH1 with and without having the gas owing
through the converter. This requires activating
the valve V1.
For the ease of use, special PLC and calcu-
lator programs are provided with analyzers
for vapor recovery applications, automatically
calculating the efciency each time after a ca-
libration has been performed. The calculated
value shows up as a measurement result on
the measurement display.
To calculate the efciency without a prece-
ding calibration, you can also start the PLC
program manually from the webbrowser
interface.
4 Maintenance section of this manual for
instructions about when and how to replace
the converter material. The appendix contains
listings of the PLC and calculator programs,
enabling automatic converter efciency cal-
culation.