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Section 2
Model 752 and 752A Differential Pressure Transmitters
Figure 2.3—Operational block diagram
Strain Gage Bridge Network
The strain gage bridge network consists of two silicone piezo-resistive strain
sensors, the zero adjusting potentiometer, bridge completion resistors, and the
temperature compensation components.
Signal Amplifier
The signal amplifier is an integrated circuit operational amplifier which pro
-
vides amplification of the strain gage bridge network output voltage.
Current Amplifier
The current amplifier circuit converts the signal amplifier output voltage to
current. The amount of current is precisely regulated with the feedback net-
work to make it proportional to the bridge output.
Temperature Compensation
The Model 752 and 752A are temperature-compensated at the factory. Only
those repairs described in Section 4 of this manual may be performed in the
field without voiding the qualifications certification.
