Manual
1 Technical Description
1.5 Functional Description
1.5.8 Complex Functions (Arithmetic blocks c, d, h)
SIP ART DR24 6DR2410
C79000-G7476-C153-03
57
Correction computer for ideal g ases CPt1, CPt2
A = Δp
·f(E2,E3)
f(E2, E3) =
(PE – PA) E2 + PA
(tE – tA) E3 + tA
E2
E3
ncon
1.000
ncon
A
x
ΔP
f(E2·E3)
.A∩
c.F
--
∩ .1
n
---
CPt1, CPt2
(oFPA)tA, tE, PA, PE
∩ .2
∩ .3
Function block correction computer CP for ideal gases
The rooted signal of the active pressure must be applied at input c**.1. The measuring ranges
are normalized to the calculation state with the parameters PA, PE, tA, tE (correction quotients
start/end for pressure and temperature).
Application
The correction computer is used to calculate the flow of gases from the active pressure Δp de-
pending on pressure and temperature. The medium must be in pure phase, i.e. no liquid sepa-
rations may take place. This should be noted particularly for gases close to the saturation.
Errors due to fluctuating status variables of the medium (pressure, temperature) are corrected
by the flow correction computer here.
t
p
q
Active pressure Δp
Pressure p Temperature t
kp/cm
2
Measured value transmission
q
Δp
Figure 1--25 Active pressure measuring procedure, Principle
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