7.0CALCULATING MOLY CONVERTER EFFICIENCIES

7.1PURPOSE

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.

7.2TOOLS

API M700 calibrator with O3 Gen option (or equivalent)

7.3PARTS

NONE

7.4PROCEDURE

1.For the sake of numbers to input into this note, we have chosen 450 PPB NO gas as our 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 are done with 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 O3 produced. For example, if the Ozone produced is 400 PPB then the NO used must be 440 or more. Typically 450 PPB NO is made and 400 PPB of Ozone is produced.

2.Leak check machine to ensure that there are no leaks in the analyzer.

3.If you have input a CE factor into the instrument firmware (this would be in the CAL-CONC-CONV-SET menu) other than 100%, change this back to 100% for the duration of this test.

4.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.

05206H DCN5910

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Teledyne M201E manual Calculating Moly Converter Efficiencies, None

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