Reference Manual
00809-0100-4235, Rev BA
April 2007
4-3
Rosemount 1152
Figure 4-1. Electrical Block Diagram.
The
␦
-Cell Sensor
Process pressure is transmitted through an isolating diaphragm and silicone
oil fill fluid to a sensing diaphragm in the center of the
␦
-cell. The reference
pressure is transmitted in like manner to the other side of the sensing
diaphragm.
The position of the sensing diaphragm is detected by the capacitance plates
on both sides of the sensing diaphragm. The capacitance between the
sensing diaphragm and either capacitor plate is approximately 150 pf. The
sensor is driven through transformer windings by an oscillator at roughly 32
kHz and 30 V
p-p.
A and D Output
DEMODULATOR
CURRENT
SOURCE
SENSOR
OSCILLATOR
CURR.
CONTROL
AMP.
CURRENT
SOURCE
FEEDBACK
RESISTER
REVERSE
POLARITY
PROTECTION
E, N, and L Output
REVERSE
POLARITY
PROTECTION
OSCILLATOR
DEMODULATOR
OSC.
CONTROL
AMP.
CURR.
CONTROL
AMP.
CURRENT
DETECTOR
CURRENT
LIMITER
VOLTAGE
REGULATOR
CURRENT
CONTROL
SENSOR
-
+
-
+
SIGNAL
-
+
SIGNAL
TEST
OSC.
CONTROL
AMP.
TEST
Summary of Contents for Rosemount 1152 Alphaline
Page 6: ...Reference Manual 00809 0100 4235 Rev BA April 2007 Rosemount 1152 1 2 ...
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Page 20: ...Reference Manual 00809 0100 4235 Rev BA April 2007 Rosemount 1152 2 10 ...
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Page 64: ...Reference Manual 00809 0100 4235 Rev BA April 2007 Rosemount 1152 Index 2 ...
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