United States Stove Company 7700, Manual

Page: 128 / 175

A-9 Percent of proportional sampling rate (PR)
Equation used
9 = >
*
+(,-)
*
<
L
+
L
<
*
+
*
<
L
+
L
<
? × 100
Nomenclature
PR Percent of proportional sampling rate (%)
θ Total sampling time, min
θ
i
Time of interval, 10 min
V
m
Volume of gas sample measured by the digital mass flow controller, dsm
3
(dscf)
V
mi(std)
Volume of gas sample measured by the digital mass flow controller during the i
th
10
minutes interval, dsm
3
(dscf)
V
S
Average gas velocity in the dilution tunnel, ft/min
V
Si
Average gas velocity in the dilution tunnel during the i
th
10 minutes interval, ft/min
T
m
Absolute average digital mass flow controller temperature, K (R)
T
mi
Absolute average digital mass flow controller temperature during the i
th
10 minutes
interval, K (R)
T
S
Absolute average gas temperature in the dilution tunnel, K (R)
T
Si
Absolute average gas temperature in the dilution tunnel during the i
th
10 minutes
interval, K (R)
Sample calculation
9 = >
*
+(,-)
*
<
L
+
L
<
*
+
*
<
L
+
L
<
? × 100
i = 1
9 = ^
7zz {|}×.~~z,o×z.€zo- ,
⁄
ׂwƒ°cׂ€°c
+ׂ.„~,o×z.ƒ‚o- ,
⁄
ׂw„.„°cׂ€°c
` × 100 = 96.5%
i = 2
9 = ^
7zz {|}×.~€€,o×z.€zo- , ⁄ ׂwƒ°cׂ€°c
+ׂ.„~,o×z.€o- , ⁄ ׂw„.„°cׂ€°c
` × 100 = 96.0%