Diaphragm type pressure sensor arrangement having corrosion resistance and yield strength

A pressure sensor comprising:

• a cylindrical member configured to be attached in an airtight manner to a body having a fluid passage in a state of communicating with the fluid passage, the cylindrical member being made of a nickel-molybdenum-chromium alloy material or a stainless steel material;
• and
• a pressure sensor unit connected to the cylindrical member for detecting a pressure of a fluid flowing through the fluid passage of the body, the pressure sensor unit comprising:
• a sensor body provided with a pressure receiving chamber into which the fluid flows and a diaphragm in contact with the fluid flowing into the pressure receiving chamber, the sensor body being closed at one end with the diaphragm, the sensor body being made of a cobalt-nickel alloy material, the sensor body being connected at an opening side end portion to one end portion of the cylindrical member in an airtight manner;
• and
• a pressure detecting element for outputting displacement of the diaphragm as pressure,
• wherein an outer diameter of the cylindrical member is smaller than a maximum outer diameter of the sensor body of the pressure sensor unit.