Teledyne 9110T instruction manual There must be a minimum of 10% more no than O3 produced

Model 9110T NOx Analyzer Troubleshooting & Service

∙In the following example a reference point of 450 ppb NO gas will be used. This is only an example. Any other reference points within measurement range of the instrument may be used.

∙For this procedure use a calibrated O3 generator, such as a Teledyne T700.

Note	There must be a minimum of 10% more NO than O3 produced.
	Example, if the Ozone concentration used is 400 ppb then the NO
	concentration must be used must be 440 ppb or more.
	PART 1: PREPARATION
	1.	Leak check machine to ensure that there are no leaks in the analyzer.
	2.	Calibrate the instrument at the same NO span gas value as being used in this
		method.
		∙ For this example 450 ppb NO span gas
	3.	If you have input a converter efficiency (CE) factor into the instrument firmware (see
		12.7.10.3 ) other than 100%, change this back to 100% for the duration of this test.
		(CAL>CONC>CONV>SET).

PART 2: DETERMINE THE AMOUNT OF NO OUTGASSED BY THE NO2  NO

CONVERTER.

4.Bypass the NO2  NO converter by placing a short piece of tubing in the gas stream in place of the converter.

5.Perform a straight dilution with 445 ppb NO gas & air as a diluent gas.

6.Input the NO gas into the analyzer.

7.Allow the machine to stabilize & write down the NOx value on line 2 of GPT data sheet (Section 12.7.11.1).

8.Remove the converter bypass so that the NO gas is flowing through the NO2  NO converter

9.Allow the machine to stabilize.

10.Write down your NOx value on your data sheet on lines 3 AND line 5 of the GPT data sheet.

11.Subtract line 2 from line 3 & write that number down on line 4. Also write the NO value on line 8 of the data sheet.

∙The specification shown on the data sheet is the value that is used by TAI when performing the procedure on new NO2  NO converters.

∙Older NO2  NO converters might outgas a bit more NO, therefore a slightly wider specification might be in order.

∙If this value is a constant or changes only slightly over time, this is not a problem the machine will calibrate this out.

Teledyne Analytical Instruments 297