Device for measuring a medium under pressure

A device for measuring at least one characteristic parameter of a medium at high pressure in a pressure housing, or pressure-resistant flow guide, with a wall of said housing or flow guide having a passage formed transversely therethrough, said at least one characteristic parameter being pressure of such medium or cavitation caused by contaminants in the medium during movement thereof, the device comprising:

• at least one capacitive sensor electrode which is responsive to said at least one parameter and is positionable in said passage;
• an electrical connection for connection to said at least one sensor in said passage;
• a reference electrode spaced from the sensor electrode by a dielectric and being in galvanic contact with the wall material;
• and
• a homogeneous glass-ceramic material which surrounds the electrical connection and at least one face of the at least one sensor electrode and extends from the at least one sensor electrode and partly through said passage and hermetically seals the passage, and anchors said at least one sensor electrode and said electrical connection to the wall material and electrically insulates said at least one sensor electrode and said electrical connection from the wall material.

A device for measuring at least one characteristic parameter of a medium at a high pressure, said medium being related to a pressure housing or a pressure-resistant flow guide, said device comprising:

• at least one capacitive sensor electrode positioned in a passage which is formed transversely through a wall of said housing or flow guide, said electrode being responsive to said at least one characteristic parameter of such a medium;
• an electrical connection connected to said at least one sensor electrode in said passage;
• and
• a homogeneous glass-ceramic material which extends around the at least one sensor electrode and the electrical connection and extends from the pressure side of the wall a selected distance through said passage and hermetically seals the passage, and anchors said at least one sensor electrode and said-electrical connection to the wall material and electrically insulates said at least one sensor electrode and said electrical connection from the wall material and any medium in the pressure housing or flow guide.

A device for measuring at least one characteristic parameter of a medium at a high pressure, said medium being related to a pressure housing or pressure-resistant flow guide, said at least one characteristic parameter being pressure of such a medium or cavitation caused by contaminants in the medium during movement thereof, said device comprising:

• at least one capacitive sensor electrode positioned in a passage which is formed transversely through a wall of said housing or flow guide, said electrode being responsive to said at least one characteristic parameter of such a medium;
• an electrical connection connected to said at least one sensor electrode in said passage;
• a reference electrode spaced from the sensor electrode by a dielectric and being in galvanic contact with the wall material;
• a homogeneous glass-ceramic material which surrounds the electrical connection and a face of the at least one sensor electrode, and extends from the at least one sensor electrode and partly through said passage and hermetically seals the passage, and anchors said at least one sensor electrode and said electrical connection to the wall material and electrically insulates said at least one sensor electrode and said electrical connection from the wall material.