Isolator system for a pressure transmitter

Abstract

An isolator system for a pressure transmitter includes a port internal to the transmitter, a sensor tube, and a fill tube. The sensor tube is connected to the port to fluidly connect a passageway through a transmitter body to a pressure sensor. The sensor tube includes a first end disposed in the port. The first end has a first cross-sectional area. The fill tube is internal to the transmitter and connected to the port to fluidly connect to the passageway. The fill tube includes a second end disposed in the port. The second end of the fill tube has a second cross-sectional area that is less than the first cross-sectional area of the sensor tube.

Description

technical field

[0001] The present invention generally relates to a pressure transmitter for an industrial process. In particular, the invention relates to an isolation system for use in pressure transmitters. Background technique

[0002] Isolation systems in pressure transmitters use a relatively inert isolation liquid that couples the pressure from the process fluid to the pressure sensor. This is necessary because pressure sensors are generally not designed to withstand direct contact with the process fluid. A flexible isolating diaphragm separates a barrier liquid, usually silicone oil, from the process fluid. Tubes and channels filled with this silicone oil are used to couple the pressure from the isolation diaphragm to the pressure sensor. The isolation system prevents process fluid from contacting the pressure sensor and interfering with the operation of the pressure sensor.

[0003] The oil fill tubes and channels are kept narrow to reduce the amount of oil used...

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