BARTON
®
MODEL 764
DIFFERENTIAL PRESSURE
TRANSMITTER
User Manual
Part No. 9A-C10880, Rev. 05
January 2020
Contents
Section 1—Introduction ................................................................................. 5
General ......................................................................................................... 5
Product Description....................................................................................... 5
Differential Pressure Unit (DPU)
............................................................... 5
Electronic Transmitter................................................................................ 5
Power Supply ............................................................................................ 5
Specifications
................................................................................................ 6
Performance .............................................................................................. 6
Application ................................................................................................. 7
Storage: ..................................................................................................... 8
Section 2—Theory of Operation .................................................................... 9
Basic Components ........................................................................................ 9
Differential Pressure Unit (DPU)
............................................................... 9
Draining or Venting.....................................................................................9
Temperature Compensation......................................................................10
Bellows......................................................................................................10
Strain Gage Assembly...............................................................................10
Range Springs..........................................................................................10
Electronic Transmitter...............................................................................10
Basic Operation ...........................................................................................11
Reverse Polarity Protection ......................................................................11
Regulator ................................................................................................. 12
Strain Gage Bridge Network.................................................................... 12
Signal Amplifier
........................................................................................ 12
Current Amplifier
...................................................................................... 12
Temperature Compensation........................................................................ 12
Section 3—Installation and Operation ........................................................ 13
Unpacking/Inspection
.................................................................................. 13
Pre-Operating Instructions
.......................................................................... 13
Mounting ..................................................................................................... 13
