Reference Manual
00809-0100-4302, Rev BA
January 2008
Rosemount 1153 Series B
4-2
C
1
is the capacitance between the high pressure side and the sensing
diaphragm.
C
2
is the capacitance between the low pressure side and the sensing
diaphragm.
Where:
I
ref
is the current source.
V
p-p
is the peak-to-peak oscillation voltage.
f
is the oscillation frequency.
Where:
I
diff
is the difference in current between C
1
and C
2
.
Therefore:
Figure 4-1. The
δ
-Cell.
fV
p
p
–
I
ref
C
1
C
2
+
--------------------
=
I
diff
fV
p
p
–
C
2
C
1
–
(
)
=
P
Constant
I
diff
×
I
ref
C
2
C
1
–
C
2
C
1
+
--------------------
⎝
⎠
⎜
⎟
⎛
⎞
=
=
Leadwires
Isolating
Diaphragm
Welded Seals
Capacitor
Plates
Sensing
Diaphragm
Rigid
Insulation
Silicone Oil
Leadwires
Capacitor
Plates
Sensing
Diaphragm
Rigid
Insulation
Silicone Oil
Welded Seals
Isolating
Diaphragm
Evacuated Absolute Reference
Содержание Rosemount 1153 Series B
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