A method of monitoring the clogging condition of a particulate filtration device for filtration of a fluid, the filtration device comprising: - a fluid inlet, - a fluid outlet, - a first fluid flow circuit connecting the fluid inlet to the fluid outlet and comprising a first filtration area having a first filtration surface (S 1) and a first filtration efficiency (E 1) for a given particle size, and - a second fluid flow circuit connecting the fluid inlet to the fluid outlet, and comprising: o a second filtration area with a second filtration surface (S 2) and a second filtration efficiency (E 2), identical to the first filtration efficiency, for the given particle size, and o a restriction having a constant hydraulic resistance, so that in operation a first part of the fluid flows through the first flow path through the first filter zone and a second part of the fluid flows through the second flow path through the second filter zone and the restriction, and the first filter zone reaches a predetermined clogging state before the second filter zone, wherein the first filter zone has a first filter ratio (R 1) and the second filter zone has a second filter ratio (R 2), the first filter ratio (R 1) being identical to the second filter ratio (R 2), wherein the filtration ratio of a filtration zone is defined, in operation, as the ratio between the number of particles, of given size, counted upstream of the filtration zone, and the number of particles, of the same given size, counted downstream of said filtration zone, the method comprising the steps of: - measure a pressure difference between the fluid inlet and the fluid outlet, - measure a fluid temperature and a fluid flow rate at the fluid inlet, and determining a clogging condition from the measured pressure difference, fluid temperature and fluid flow rate, and a reference characteristic curve defining a clogging condition as a function of pressure difference. - a fluid inlet, - a fluid outlet, - a first fluid flow circuit connecting the fluid inlet to the fluid outlet and comprising a first filtration area having a first filtration surface (S 1) and a first filtration efficiency (E 1) for a given particle size, and - a second fluid flow circuit connecting the fluid inlet to the fluid outlet, and comprising: o a second filtration area with a second filtration surface (S 2) and a second filtration efficiency (E 2), identical to the first filtration efficiency, for the given particle size, and o a restriction having a constant hydraulic resistance, so that in operation a first part of the fluid flows through the first flow path through the first filter zone and a second part of the fluid flows through the second flow path through the second filter zone and the restriction, and the first filter zone reaches a predetermined clogging state before the second filter zone, o a second filtration area with a second filtration surface (S 2) and a second filtration efficiency (E 2), identical to the first filtration efficiency, for the given particle size, and o a restriction having a constant hydraulic resistance, so that in operation a first part of the fluid flows through the first flow path through the first filter zone and a second part of the fluid flows through the second flow path through the second filter zone and the restriction, and the first filter zone reaches a predetermined clogging state before the second filter zone, wherein the first filter zone has a first filter ratio (R 1) and the second filter zone has a second filter ratio (R 2), the first filter ratio (R 1) being identical to the second filter ratio (R 2), wherein the filtration ratio of a filtration zone is defined, in operation, as the ratio between the number of particles, of given size, counted upstream of the filtration zone, and the number of particles, of the same given size, counted downstream of said filtration zone, the method comprising the steps of: - measure a pressure difference between the fluid inlet and the fluid outlet, - measure a fluid temperature and a fluid flow rate at the fluid inlet, and - measure a pressure difference between the fluid inlet and the fluid outlet, - measure a fluid temperature and a fluid flow rate at the fluid inlet, and determining a clogging condition from the measured pressure difference, fluid temperature and fluid flow rate, and a reference characteristic curve defining a clogging condition as a function of pressure difference.