Travis Industries Xtrordinair 44 Elite, Manual

Page: 125 / 158

OMNI-Test Laboratories, Inc.
PR - Proportional Rate Variation
ASTM E2515 equation (16)
Where:
θ = Total sampling time, min
θ
i
= Length of recording interval, min
V
mi
=
Volume of gas sample measured by the dry gas meter during the “ith”
time interval, dcf
V
m
= Volume of gas sample as measured by dry gas meter, dcf
V
si
= Average gas velocity in the dilution tunnel during the "ith" time interval, ft/sec
V
s
= Average gas velocity in the dilution tunnel, ft/sec
T
mi
=
Absolute average dry gas meter temperature during the "ith" time interval,
o
R
T
m
=
Absolute average dry gas meter temperature,
o
R
T
si
=
Absolute average gas temperature in the dilution tunnel during the "ith" time interval,
o
R
T
s
=
Absolute average gas temperature in the dilution tunnel,
o
R
Sample calculation (for the first 1 minute interval of Train 1):
1080 x 1.362 x 18.70 x ( 215.0 + 460 ) x ( 79.6 + 460 )
10 x 150.7 x 19.12 x ( 99.6 + 460 ) x ( 79.0 + 460 )
PR = 115 %
x 100
) (
PR =
100







   
   
=
s mi si m i
si m s mi
T T V V
T T V V
PR


Control No. P-SSAR-0003 Run 4_Low_10 min data
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