Pressure transmitter with improved isolator system
First Claim
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1. 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 central backing plate region including an annular groove that intersects with passageway.
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Abstract
A pressure transmitter with a fluid isolator that includes a sensor tube and a fill tube that have “D” shaped ends that connect together in a port internal to the transmitter. The shaped ends can be brazed into the port for sealing. Fitting both the sensor tube and the fill tube in the same port provides a low cost isolator with reduced isolator liquid volume. The fluid isolator has an isolator diaphragm with a central diaphragm region overlying a central backing plate that includes a annular groove. The annular groove avoids slow response of the isolator after an overpressure condition.
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Citations
12 Claims
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1. A pressure transmitter with an improved isolator system, comprising:
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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 central backing plate region including an annular groove that intersects with passageway. - View Dependent Claims (2, 3, 4, 5)
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6. A pressure transmitter with an improved isolator system, comprising:
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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. - View Dependent Claims (7, 8, 9, 10)
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11. A pressure transmitter with an improved isolator system, comprising:
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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.
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12. A pressure transmitter with an improved isolator system, comprising:
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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.
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Specification