Sherwood GF55, Manual, Page: 66 / 159

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):
361 x 0.154 x 12.83 x ( 114.0 + 460 ) x ( 81.9 + 460 )
1 x 59.52 x 13.07 x ( 93.6 + 460 ) x ( 75.0 + 460 )
PR = 96 %
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-SFDK-0002, Effective date: 5/06/2016 File - Run 1, Tab - Example Calculations
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