A multivariable transmitter is provided for measuring multiple process fluid variables. The multivariable transmitter includes a metal housing constructed from a material suitable for exposure to a corrosive material, such as seawater. A differential pressure sensor is disposed within the metal housing. A line pressure sensor is also disposed within the metal housing. Measurement circuitry is operably coupled to the differential pressure sensor and the line pressure sensor to provide differential pressure and line pressure outputs. A temperature probe has a sheath constructed from a material suitable for exposure to the corrosive material. The temperature probe is electrically coupled to circuitry within the metal housing and is physically coupled to the metal housing via a high-pressure coupling.

A platinum resistance temperature sensor having a housing that contains a platinum member. The housing includes a first substrate having a first support and a second support spaced apart from an upper surface of the first substrate. The first support of the first substrate supports a first portion of the platinum member and the second support supports a second portion of the platinum member. Medial portions of the platinum member are suspended over the upper surface of the first substrate between the first support and the second support.

A temperature sensor includes a main body having a peripheral surface that extends along an axis between ends of the main body. A plurality of support structures are arranged along the main body and project from the peripheral surface of the main body transversely to the axis. A sleeve has a cavity defined by one or more sidewalls extending between first and second ends. The main body of the temperature sensor is positioned within the cavity. A platinum member having a length that extends along the main body is supported by a set of support structures of the plurality of support structures. In some cases, a seal member extends between the one or more sidewalls at the first end of the sleeve and seals the main body and the platinum member within the cavity. Measurement terminals may extend from the platinum member to an exterior of the temperature sensor.

A temperature sensor includes a main body having a peripheral surface that extends along an axis between ends of the main body. A plurality of support structures are arranged along the main body and project from the peripheral surface of the main body transversely to the axis. A sleeve has a cavity defined by one or more sidewalls extending between first and second ends. The main body of the temperature sensor is positioned within the cavity. A platinum member having a length that extends along the main body is supported by a set of support structures of the plurality of support structures. In some cases, a seal member extends between the one or more sidewalls at the first end of the sleeve and seals the main body and the platinum member within the cavity. Measurement terminals may extend from the platinum member to an exterior of the temperature sensor.

A temperature sensor element includes: an element main body including a heat sensitive body including a thermistor sintered body of which the electrical characteristics change with temperature, and a pair of lead wires that is connected to the heat sensitive body through electrodes; and a protective layer that protects the heat sensitive body. The protective layer has an inner protective layer covering the heat sensitive body and an outer protective layer covering the outer side of the inner protective layer. The inner protective layer is formed of an aggregate of particles that are chemically stable with respect to the thermistor sintered body and made of non-metal.

A temperature sensor element includes: an element main body including a heat sensitive body including a thermistor sintered body of which the electrical characteristics change with temperature, and a pair of lead wires that is connected to the heat sensitive body through electrodes; and a protective layer that protects the heat sensitive body. The protective layer has an inner protective layer covering the heat sensitive body and an outer protective layer covering the outer side of the inner protective layer. The inner protective layer is formed of an aggregate of particles that are chemically stable with respect to the thermistor sintered body and made of non-metal.

To obtain a temperature sensor device having high reliability and high sensitivity without cost increase. This temperature sensor device includes: a housing provided with a temperature sensor module having a temperature detection element and an external connection terminal connected to the temperature detection element via a lead wire, which are integrated using a first formation member made from a thermoplastic resin, the temperature sensor module being covered with a second formation member made from a thermoplastic resin, so as to form a connector for connecting the external connection terminal to an external signal processing circuit; and a case into which the temperature sensor module is press-fitted and which is opposed to the housing, wherein the first formation member and the second formation member are welded to each other.

To obtain a temperature sensor device having high reliability and high sensitivity without cost increase. This temperature sensor device includes: a housing provided with a temperature sensor module having a temperature detection element and an external connection terminal connected to the temperature detection element via a lead wire, which are integrated using a first formation member made from a thermoplastic resin, the temperature sensor module being covered with a second formation member made from a thermoplastic resin, so as to form a connector for connecting the external connection terminal to an external signal processing circuit; and a case into which the temperature sensor module is press-fitted and which is opposed to the housing, wherein the first formation member and the second formation member are welded to each other.

A temperature sensor includes a metal tube having an opening tip portion, a temperature sensing element for measuring a temperature, a pair of lead wires contacting with a surface of the temperature sensing element, an insulating support material for insulating the pair of lead wires from the metal tube, and a coating material for covering the temperature sensing element, lead tip portions of the pair of lead wires, and a tip surface of the insulating support material at the opening tip portion of the metal tube. The coating material has a property of not allowing measurement target gas to pass through and contains oxide and at least one of platinum, platinum alloy, and platinum-containing oxide that are dispersed in the oxide.

A resistance pattern that contains platinum as a main component is formed into a meander shape and on a main surface of a ceramic substrate. A protective film layer that covers the resistance pattern has a two-layer structure including a trap layer as an inner layer and an overcoat layer as an outer layer. The trap layer contains alumina as a main component and 2 to 30 vol % of platinum. The overcoat layer contains alumina as a main component. With such a configuration, even when reactivity of the platinum resistance pattern becomes higher under high temperature use, platinum contained in the trap layer reacts with oxygen or impurities etc. contained in the ceramic substrate. Thus, reaction of the platinum resistance pattern can be suppressed.