A retrievable pressure sensor for in situ measurement of pressure in a process fluid in a pipe/chamber, the pressure sensor comprising: - a pressure-transferring device comprising: - a first device for sealing attachment in an opening in a wall of the pipe/chamber where the pressure is to be measured, the first device comprising: - a first separation diaphragm for separating between the process fluid and a pressure-transferring fluid, - a second device for attachment at a distance from the pipe/chamber where the pressure is to be measured, the second device comprising: - a second separation diaphragm; and - a first cavity containing the pressure-transferring fluid, wherein the first cavity comprising a capillary tube for a pressure transferring connection between the first device and the second device, and where the pressure sensor further comprising: - an outer sensor part having a pressure sensing element, where the outer sensor part is attached at a distance from the pipe/chamber where the pressure is to be measured, the outer sensor part comprising: - a second cavity containing a pressure-transferring fluid in pressure communication with the pressure sensing element, - a third separation diaphragm bounding the second cavity, the third separation diaphragm being configured for pressure communication with the second separation diaphragm for pressure transferral between the pressure-transferring fluid in the cavity and the pressure-transferring fluid in the second cavity, and - a volume surrounding the second and the third separation diaphragms (8a, 8b) in a contact area for the second and the third separation diaphragms. - a pressure-transferring device comprising: - a first device for sealing attachment in an opening in a wall of the pipe/chamber where the pressure is to be measured, the first device comprising: - a first separation diaphragm for separating between the process fluid and a pressure-transferring fluid, - a second device for attachment at a distance from the pipe/chamber where the pressure is to be measured, the second device comprising: - a second separation diaphragm; and - a first cavity containing the pressure-transferring fluid, wherein the first cavity comprising a capillary tube for a pressure transferring connection between the first device and the second device, - a first device for sealing attachment in an opening in a wall of the pipe/chamber where the pressure is to be measured, the first device comprising: - a first separation diaphragm for separating between the process fluid and a pressure-transferring fluid, - a first separation diaphragm for separating between the process fluid and a pressure-transferring fluid, - a second device for attachment at a distance from the pipe/chamber where the pressure is to be measured, the second device comprising: - a second separation diaphragm; and - a second separation diaphragm; and - a first cavity containing the pressure-transferring fluid, wherein the first cavity comprising a capillary tube for a pressure transferring connection between the first device and the second device, - an outer sensor part having a pressure sensing element, where the outer sensor part is attached at a distance from the pipe/chamber where the pressure is to be measured, the outer sensor part comprising: - a second cavity containing a pressure-transferring fluid in pressure communication with the pressure sensing element, - a third separation diaphragm bounding the second cavity, the third separation diaphragm being configured for pressure communication with the second separation diaphragm for pressure transferral between the pressure-transferring fluid in the cavity and the pressure-transferring fluid in the second cavity, and - a volume surrounding the second and the third separation diaphragms (8a, 8b) in a contact area for the second and the third separation diaphragms. - a second cavity containing a pressure-transferring fluid in pressure communication with the pressure sensing element, - a third separation diaphragm bounding the second cavity, the third separation diaphragm being configured for pressure communication with the second separation diaphragm for pressure transferral between the pressure-transferring fluid in the cavity and the pressure-transferring fluid in the second cavity, and - a volume surrounding the second and the third separation diaphragms (8a, 8b) in a contact area for the second and the third separation diaphragms.