Pressure transmitter with improved isolator system

A pressure transmitter with an improved isolator system, comprising:

• a transmitter body having an external isolator rim around a shaped concavity that is liquidly coupled to a port internal to the transmitter through a passageway through the body, the concavity having a central backing plate region;
• an isolator diaphragm having a diaphragm rim sealed to the isolator rim and having a central diaphragm region overlying and spaced apart from the central backing plate region;
• isolator liquid between the isolator diaphragm and the shaped concavity and in the passageway;
• a pressure sensor receiving pressure from the port through a sensor tube with a first shaped end disposed in the port, the sensor generating a pressure output;
• a fill tube internal to the transmitter and adapted to seal off the isolator, the fill tube having a second shaped end disposed in the port;
• and
• the fill tube and the sensor tube being shaped to fit together in the port and brazed in the port.

A pressure transmitter with an improved isolator system, comprising:

• a transmitter body having an external isolator rim around a shaped concavity that is liquidly coupled to a port internal to the transmitter through a passageway through the body, the concavity having a central backing plate region;
• an isolator diaphragm having a diaphragm rim sealed to the isolator rim and having a central diaphragm region overlying and spaced apart from the central backing plate region;
• isolator liquid between the isolator diaphragm and the shaped concavity and in the passageway;
• a pressure sensor receiving pressure from the port through a sensor tube with a first shaped end disposed in the port, the sensor generating a pressure output;
• and
• a fill tube internal to the transmitter and adapted to seal off the isolator, the fill tube having a second shaped end disposed in the port.

A pressure transmitter with an improved isolator system, comprising:

• a transmitter body having an external isolator rim around a shaped concavity that is liquidly coupled to a port internal to the transmitter through a passageway through the body, the concavity having a central backing plate region;
• an isolator diaphragm having a diaphragm rim sealed to the isolator rim and having a central diaphragm region overlying and spaced apart from the central backing plate region;
• isolator liquid between the isolator diaphragm and the shaped concavity and in the passageway;
• a pressure sensor receiving pressure from the port through a sensor tube with a first shaped end disposed in the port, the sensor generating a pressure output;
• a fill tube internal to the transmitter and adapted to seal off the isolator, the fill tube having a second shaped end disposed in the port;
• and
• means for providing, in the central backing plate region, an annular groove that intersects with the passageway.