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Calculating Moly Converter Efficiencies Teledyne API Model T201 NH
3
Analyzer Operator Manual
36 07271B DCN6646
3. The first gas check is to test to see how much the converter is eating
NO gas or out gassing NO gas. Bypass the converter in the machine,
by placing a short piece of tubing in place of the converter. Perform a
straight dilution with NO gas and air as a diluent gas. Input this 450
PPB NO gas into the analyzer, allow the machine to stabilize, and
write down the NOx value on your data sheet on line 3.
4. Remove the converter bypass and install the converter back into the
NOx sample stream, such that the NO sample goes through the
converter again and allow the machine to stabilize. Write down your
NOx value on your data sheet on line 4 AND line 6 of the data sheet.
5. Note the NO value and input that on line 9 of the data sheet.
6. Subtract line 3 from line 4 and write that number down on line 5. The
spec on the data sheet is the value that we use here in house, and
your spec might be a bit higher. We have found that on NEW Moly
converters this spec is a good one that predicts a good performing
Moly converter, but in an older converter might eat a bit more NO, and
this would be acceptable. If it is a constant value, or changes little
over time, this is not a problem the machine will calibrate this out.
7. The next step is to perform your GPT. Generate the same 450 PPB
NO gas and input 400 PPB of O
3
(or generate 450 PPB NO and 400
PPB NO
2
, if that’s what your calibrator says). Allow the machine to
stabilize for 10 minutes and then write down the NOx value on line 7
and the NO value on line 10.
8. Subtract line 7 from line 6 and put that onto line 8
9. Subtract line 10 from line 9 and put that onto line 11
10. Put the number from line 8 into the letter A on line 12 and put the
number from line 11 into the letter B on line 12.
11. Divide A by B and multiply it by 100 and put it into letter C on line 12.
12. Put the number in letter C onto the C on line 13 and subtract that
value from 100 and put it into letter D on line 13. this is the converter
efficiency.
13. This value should be >96%. If below 96%, replace the converter.