Figure 5-7. Detector With First Stage Amplifier And Pressure Compensation Circuits; Figure 5-8. Pressure Signal And Reference Voltage Circuits - Emerson 755A Instruction Manual

Instruction Manual
245364-V
May 2002
R19
10
+15V
R18
24.9K
-15V
C6
R9
110
BT1
BT2
1000pf
DS1
FEEDBACK
LOOP

Figure 5-7. Detector with First Stage Amplifier and Pressure Compensation Circuits

REFERENCE
R19
TRIM
PRESS
SENSOR
+10V
5-10 Circuit Analysis
C2
.01uF
R6
CR2
2M
-
U1
+
C3
R8
.47uF
1.69K
R7
118K
Reference Voltage Circuit
U3
REFERENCE
R98
-
U7
+
R99

Figure 5-8. Pressure Signal and Reference Voltage Circuits

-
U4
+
FRONT
PANEL
SPAN
R16
+15V
R44
200K R13
20K
-15V
+15V
30K
R9
20K
C1
-15V
.0022uF
R5
-
U2
+
R17
-
U5
+
-
U9
+
-10V
Rosemount Analytical Inc.
Model 755A
Vx
-
U6
U8
Vz
+
From Pressure
Signal Circuit
Figure 6-8
FRONT
PANEL
ZERO
DETECTOR
COARSE
ZERO
+10.00V
Reference
Voltages
-10.00V
CAL 1
To Test
Switch
CAL2
To Analog
Divider U6
A Division of Emerson Process Management
To Digital and
Analog Circuits