Acid-resistant pressure sensor

A pressure sensor comprising:

• a housing having a conductive member disposed therein and a hollow portion;
• a sensing element disposed in a bottom surface of the hollow portion of the housing, the sensing element detecting a pressure and producing an electrical signal in accordance with the detected pressure;
• a wiring member for electrically connecting between the conductive member and the sensing element;
• and
• a protective member which has an electrical insulating property and covers the conductive member, the sensing element and the wiring member, wherein
• the conductive member includes a part exposed outside from the housing,
• the protective member includes a first protective member, a second protective member, and a third protective member,
• the first protective member is made of a fluorine-based rubber and disposed in the hollow portion to cover the conductive member,
• the second protective member is made of a fluorine-based gel and disposed on the first protective member to cover the sensing element, and
• the third protective member is made of a material having a higher acid resistance than the fluorine-based gel and disposed on the second protective member to cover the hollow portion of the housing.