TE-5170V VFC TSP 24 Operations Manual
Po/Pa is calculated next. This is done using the following equation:
22. Po/Pa = 1 - Pf/Pa
23. where: Pa = ambient barometric pressure during calibration, mm Hg.
Inserting the numbers from the worksheet:
24. Po/Pa = 1 11.95294/749.3
25. Po/Pa = 1- .0159521
26. Po/Pa = .984
Use Po/Pa and the ambient temperature during the calibration (Ta) to locate
the flow for the calibration point in the Look Up table. Record this in the
column titled Look Up. Calculate the percent difference using the following
equation:
27. % Difference = (Look Up flow - Qa)/Qa * 100
Inserting the numbers from the worksheet:
28. % Difference = (1.287 - 1.323)/1.323 * 100
29. % Difference = (-0.036)/1.323 * 100
30. % Difference = (-0.0272108) * 100
31. % Difference = -2.72
It is possible that your answers to the above calculations may vary. This is
most likely due to different calculators carrying numbers to different decimal
points. This should not be an area of concern as generally these variations
are slight.
The above calculations have to be performed for all five calibration points.
Once this is done, the calibration is complete.