Patent ID: 7762140
Filing Date: 2010-07-27
Classification: G01L

Abstract:
1. Combined fluid pressure and temperature sensor apparatus comprising: a housing having a longitudinal axis and first and second ends disposed along the axis, a fluid receiving port disposed at the first end, a fluid pressure chamber formed in the housing with the port in fluid receiving communication therewith, a tubular wall formed at the second end of the housing forming an open end, a fluid pressure sensor, the pressure sensor having a substrate and a relatively flexible diaphragm, each having an outer periphery, both the substrate and the diaphragm formed of electrically insulative material, the diaphragm disposed on the substrate and attached thereto by a glass seal therebetween located adjacent to the outer peripheries of the substrate and diaphragm, the fluid pressure sensor disposed in the sensor housing with a face surface of the diaphragm exposed to the fluid pressure chamber, an electrically insulative connector body attached to the open end of the housing, an electric circuit chamber formed between the connector body and the substrate, a signal conditioning electric circuit received in the electric circuit chamber, electric terminals mounted in the connector body extending into the electric circuit chamber and being connected to the signal conditioning electric circuit, electric pins extending through the substrate aligned with the glass seal and having one end electrically connected to the signal conditioning circuit, the other end of the at least some pins electrically connected to the pressure sensor, a temperature responsive element disposed on the said face surface of the diaphragm exposed to the fluid pressure chamber, first and second leads electrically attached to spaced portions of the element formed on the said face surface of the diaphragm, the first and second leads extending through the diaphragm and being electrically connected to other respective electric pins extending through the substrate, the fluid pressure receiving port having a longitudinally extending tubular portion extending from the first end of the housing and being formed with a fluid flow diffuser, the fluid flow diffuser having at least one first path leading from the first end to the fluid pressure chamber and at least one second path leading from the fluid pressure chamber to the first end of the housing whereby fluid is directed through the at least one path into engagement with the temperature responsive resistive element and back through the at least one second path.