Tisch Environmental TE-5200, Operation Manual

Page: 21 / 34

TE-5200 21 Operations Manual
A calibration that has a correlation coefficient of less than .990 is not
considered linear and should be re-calibrated. As you can see from the
worksheet we have 5 good Qstd numbers and the correlation coeff. is > .990
thus we have a good calibration.
Total Volume
To figure out the total volume of air that flowed through the sampler during your
sampling run take a set-up reading (when you set the sampler up manually turn it on
and take a manometer reading; in our example it should be 3.7 inches of H
2
O) and a
pick-up reading (after the sample has been taken again manually turn sampler on and
take a manometer reading; for our example let's say it read 3.3 inches of H
2
O).
Take 3.7 + 3.3 = 7.0 7.0/2 = 3.5 so the manometer reading you would use is 3.5 .
Put that into the formula (on bottom of worksheet):
1/m((Sqrt(in H
2
O)(Pav/760)(298/Tav)) - b)
m
= sampler slope
b = sampler intercept
in H
2
O = average manometer reading
Tav = daily average temperature
Pav = daily average pressure
Sqrt = square root
Example:
m
3
/min = 1/1.2809((Sqrt(3.5)(298/294)(760/760))-(0.2458))
m
3
/min = .780701 ((Sqrt(3.5)(1.0136054)(1)) - 0.2458)
m
3
/min = .780701 ((Sqrt(3.5476189)) - 0.2458)
m
3
/min = .780701 ((1.8835123) – 0.2458)
m
3
/min = .780701 (1.6377123)
m
3
/min = 1.2785636
ft
3
/min = 1.2785636 x 35.31 = 45.14608
Total ft
3
= ft
3
/min x 60 x hours that sampler ran
Let's say our sampler ran 23.9 hours (end ETI reading - start ETI reading)