DH Instruments PG7000, Руководство по эксплуатации и обслуживанию

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PG7000™ OPERATION AND MAINTENANCE MANUAL
© 1998-2008 DH Instruments, a Fluke Company Page 208
7.2.2 PG7601
PG7601 performs pressure to mass and mass to pressure calculations as follows:
•
Gauge mode:
Η G
P ,
,P
m
a
G
P
A
π
Α
πΓ
ρ
ρ
Mg
P
+
+
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
=
θ
θ
2 1
( )( )
[ ]
( )
nom C P ,P θ
P λ α α θ A A
+ + − + ⋅ ⋅ =
−
1 20 1 10
6
0 , 20
•
Absolute pressure by adding atmospheric pressure:
atm HA
,P
,P
m
a
A
P P
A
π
A
πΓ
ρ
ρ
Mg
P
+ +
+
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
=
θ
θ
2 1
( )( )
[ ]
( )
nom C P ,P θ
P λ α α θ A A
+ + − + ⋅ ⋅ =
−
1 20 1 10
6
0 , 20
•
Absolute pressure with vacuum reference:
vac HA
,P
,P
A
P P
A
π
A
πΓ Mg
P
+ +
+
=
θ
θ
2
( )( )
[ ]
( )
nom C P ,P θ
P λ α α θ A A
+ + − + ⋅ ⋅ =
−
1 20 1 10
6
0 , 20
•
Differential pressure (differential mode):
offset RPM vac HA
,P
,P
D
P P P P
A
π
A
πΓ Mg
P
− − + +
+
=
θ
θ
Δ
2
( )( )
[ ]
( )
nom C P ,P θ
P λ α α θ A A
+ + − + ⋅ ⋅ = −
1 20 1 10
6
0 , 20