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A-9
PISTON PRESSURE GAUGE PRESSURE CALCULATION WORKSHEET (SI UNITS)
Date
Expected Temperature, (t)
o
C
Reference Plane Difference, h m A
o(t)
= A
o(23)
[1 + c(t-23
o
C)] m
2
Mass Set Serial No. Local Gravity, g
L
m/sec
2
Piston Serial No.
Air Density,
ρ
air
g/cm
3
kg/m
3
A
o(23)
= A
o
at 23
o
C m
2
Gravity & Buoyancy, K
2
b
1
/MPa /Pa Tare, Mass kg
b
2
/Mpa
2
/Pa
2
Reference Pressure, P
R
mtorr Pa
c /
o
C
1 2 3 4 5 6 7 8 9 10 11 12
P
B
NOMINAL
PRESSURE
ρ
medium
(Mass Density)
ρ
W
=
(ρ
medium
-
ρ
air
kg/m
3
)
x g
L
P
H
=
ρ
W
x h
P
A
=
P
B
+ P
H
-
P
R
1 + b
1
P
A
+ b
2
P
A
2
A
e(t)
=
A
o(t)
x
Column 6
F =
P
A
x A
e(t)
M =
F x K
2
Masses
to be
used
Remainder
Temp. Coef. =
Column 9 x
1000g/kg x c
Pa kg/m
3
N/m
3
Pa Pa m
2
N kg Tare Plus grams g/
o
C