Bacharach Flue-Gas Sample Conditioning System Dokumentacja Pobierz pdf (Strona 38)

Operation ECA 450

34 Instruction 0024-9400

8. At the conclusion of the data collection process, the ECA 450 calculates

the average and standard deviation values of the emissions data just

recorded. A Final Statistics screen then appears that shows the average

and one standard deviation of each gas measured; the number of readings

taken; and the duration of the test. Use the

∧∨ keys to scroll through the

readings on the display.

If a sensor goes into over range or the calculated standard deviation

exceeds 999.9, the display will show “– – – – –” or “xxxxx” respectively for

the average and standard deviation.

««Final Statistics««

AVG 1SD

O2(%) 14.5 0.3

CO(ppm) 10 1.3

NO(ppm) 37 0.3

NO2(ppm) 6 0.3

NOX(ppm) 43 1.5

SO2(ppm) 0 0.0

HC(%) 0.10 0.01

# or Rdgs 30

Duration 5 min

In this example, the average oxygen reading was 14.5% with a one

standard deviation of 0.3 — meaning that there is a 68% chance the

oxygen readings taken during the sampling duration were between 14.2

and 14.8% (AVG ± 1SD), and a 95% chance the oxygen readings were

between 13.9 and 15.1% (AVG ± 2SD).

9. If desired, press PRINT to obtain a hard copy of the Final Statistics

screen.

Note: The data shown in the Final Statistics screen cannot be saved.

10. Press ENTER to display the Combustion Test HOLD screen. At this time

the Statistics mode is automatically turned OFF and all statistical data is

erased.

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Bacharach Flue-Gas Sample Conditioning System Dokumentacja Strona 38