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07271B DCN6646 35
6.0 CALCULATING MOLY CONVERTER EFFICIENCIES
6.1 PURPOSE
To provide instructions on how to calculate the efficiency of a Moly
converter when using a GPT method of testing converters, by using the
US EPA method, where the actual concentration of ozone is not a factor in
the accuracy of the calculation of the converter efficiency. This procedure
is based on the Code of Federal Regulations, Title 40, Chapter I,
subchapter C, Part 50, Appendix F.
6.2 TOOLS
API T700 calibrator with O
3
Gen option (or equivalent)
Moly Test Data Sheet (provided on page following this procedure)
6.3 PARTS
NONE
6.4 PROCEDURE
For the purpose of providing an example, this procedure uses 450 PPB NO
gas as the reference point, you don’t have to pick these values, they are
just an example. There is also an assumption that the analyzer has a good
calibration done @ 450 PPB NO span gas. If this is not the case, then
once you have finished the leak check on the analyzer, input your 450 PPB
NO span gas and calibrate the analyzer.
Note
For the GPT to be performed correctly, there must be a minimum of
10% more NO than O
3
produced. For example, if the Ozone produced
is 400 PPB then the NO used must be 440 PPB or more. Typically 450
PPB NO is titrated against 400 PPB of Ozone
.
1. Leak check machine to ensure that there are no leaks in the analyzer.
2. For the duration of this test, set the CE factor to 1.0000 (100%) in the
instrument firmware (this would be in the CAL-CONC-CONV-SET
menu).