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B. NOx CALCULATIONS
ONLY AN NO SENSOR FITTED
•
WORKING IN PPM: NOx REFERENCED TO NO
The user can select the assumed NO2 percentage and the O2 normalized level then: NOx in ppm = NO in
ppm multiplied by (1 + assumed NO2 percentage) in this setup NOx can only be displayed as NOx = NO
then normalizing:
NO in ppmn = NO in ppm multiplied by (21 minus the O2 norm setting) and then divided by (21 minus the
actual O2 reading)
For a worked example assume:
NO is 1000ppm
NO2 is 5% of NO
O2norm is set to 3%
actual O2 is zero
NOx in ppm = 1000 x (1 +5/100) =1000 x1.05 = 1050 ppm
NO ppmn = 1000 x (21 - 3)/(21-0) = 1000 x 18 / 21 = 857 ppmn
NOx ppmn = 1050 x 18 / 21 = 900 ppmn
or
NOx ppmn = 857 x 1.05 = 900 ppmn
•
WORKING IN MG/M3: NOx REFERENCED TO NO OR NO2
The user can select the assumed NO2 percentage, the O2 reference level and whether the NOx reading is
referenced to NO or NO2
•
WORKING IN MG/M3: REFERENCED TO NO
NO in mg/m3 = NO in ppm multiplied by 1.34
NOx in mg/m3 = NO in mg/m3 multiplied by (1 + assumed NO2 percentage)
•
WORKING IN MG/M3: NOx REFERENCED TO NO2
NOx in mg/m3 = NO in ppm multiplied by 2.05 multiplied by (1 + assumed NO2 percentage)
or
NOx in mg/m3 = NO in mg/m3 divided by 1.34, multiplied by 2.05 and multiplied by (1 +assumed NO2
percentage)
•
NORMALIZING READINGS
normalized reading = initial reading multiplied by (21 minus the O2norm setting) and then divided by (21
minus the actual O2 reading)
Содержание K9206
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