# US 10,480,376 B2 · Urea sensor protection assembly and urea sensor system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,376 B2 - Document ID: US10480376B2 - Status: Granted - Kind: B2 - Application number: 15/910,675 - Filed: 2018-03-02 - Published: 2018-09-06 - Granted: 2019-11-19 - Earliest claimed: 2017-03-03 - Assignees: MEAS France - Applicants: MEAS France - Inventors: Vincent Leger; Armand Castandet; Dariga Toulon-Meekhun - Web page: https://patentgrep.com/patent/US10480376B2 ## CPC - F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent} - B01D 29/07: with corrugated, folded or wound filtering sheets - B01D 35/027: rigidly mounted in or on tanks or reservoirs (B01D35/04 takes precedence) - B01D 35/30: Filter housing constructions - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 11/00: Monitoring or diagnostic devices for exhaust-gas treatment apparatus - F01N 2530/18: Plastics material, e.g. polyester resin - F01N 2610/02: the substance being ammonia or urea - F01N 2610/1406: Storage means for substances, e.g. tanks or reservoirs - F01N 2610/1426: Filtration means - F01N 2610/148: Arrangement of sensors - F01N 2610/1493: Purging the reducing agent out of the conduits or nozzle - Y02T 10/12: Improving ICE efficiencies - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A urea sensor protection assembly for protecting a fluid sensor of a urea sensor system comprises an inner cage supporting the fluid sensor and an outer cage. The inner cage has a first fixation element fixing the inner cage to a common holder. The outer cage has a filter capable of blocking a plurality of air bubbles and/or allowing a fluid to pass and a second fixation element fixing the outer cage to the common holder. The inner cage is at least partially arranged in an inner volume of the outer cage in an assembled state. ## Claims ### Claim 1 A urea sensor protection assembly for protecting a fluid sensor of a urea sensor system, comprising: an inner cage supporting the fluid sensor and having a first fixation element fixing the inner cage to a common holder; an outer cage having a filter capable of blocking a plurality of air bubbles and/or allowing a fluid to pass and a second fixation element fixing the outer cage to the common holder, the inner cage at least partially arranged in an inner volume of the outer cage in an assembled state; and a bubble outlet opening formed by a gap between the inner cage and the outer cage. ### Claim 2 (depends on 1) The urea sensor protection assembly of claim 1, wherein the outer cage has an upper cover and a lower cover, the upper cover and the lower cover jointly forming a receptacle for the inner cage. ### Claim 3 (depends on 2) The urea sensor protection assembly of claim 2, wherein the upper cover and the lower cover each have at least one filter. ### Claim 4 (depends on 2) The urea sensor protection assembly of claim 2, wherein the upper cover has an upper wall extending perpendicular to a bubble ascension direction toward the bubble outlet opening. ### Claim 5 (depends on 2) The urea sensor protection assembly of claim 2, wherein the upper cover has an upper wall which extends inclined with respect to a bubble ascension direction toward the bubble outlet opening. ### Claim 6 (depends on 1) The urea sensor protection assembly of claim 1, wherein the first fixation element and/or the second fixation element is clamped to a tubular member of the sensor system. ### Claim 7 (depends on 1) The urea sensor protection assembly of claim 1, wherein the bubble outlet opening is disposed above the inner cage in a bubble ascension direction. ### Claim 8 (depends on 1) The urea sensor protection assembly of claim 1, wherein the inner cage and the outer cage are spaced apart by a spacer to form the bubble outlet opening. ### Claim 9 (depends on 1) The urea sensor protection assembly of claim 1, wherein the outer cage is closed at on at least three sides of the outer cage. ### Claim 10 (depends on 9) The urea sensor protection assembly of claim 9, wherein the inner cage is inserted into the outer cage through a side other than the at least three closed sides. ### Claim 11 (depends on 9) The urea sensor protection assembly of claim 9, wherein the at least three sides are each a solid side wall of the outer cage. ### Claim 12 A urea sensor arrangement, comprising: a fluid sensor; and a urea sensor protection assembly including an inner cage having a first fixation element fixing the inner cage to a common holder, the fluid sensor arranged inside the inner cage; an outer cage having a filter capable of blocking a plurality of air bubbles and/or allowing a fluid to pass and a second fixation element fixing the outer cage to the common holder, the inner cage at least partially arranged in an inner volume of the outer cage in an assembled state; and a bubble outlet opening formed by a gap between the inner cage and the outer cage. ### Claim 13 A urea sensor protection system, comprising: a tubular member disposed in a fluid tank; and a urea sensor protection assembly including an inner cage supporting a fluid sensor and having a first fixation element fixing the inner cage to the tubular member; an outer cage having a filter capable of blocking a plurality of air bubbles and/or allowing a fluid to pass and a second fixation element fixing the outer cage to the tubular member, the inner cage at least partially arranged in an inner volume of the outer cage in an assembled state; and a bubble outlet opening formed by a gap between the inner cage and the outer cage. ### Claim 14 (depends on 13) The urea sensor protection system of claim 13, wherein the first fixation element abuts the second fixation element on the tubular member. ### Claim 15 (depends on 13) The urea sensor protection system of claim 13, wherein the inner cage is disposed between a pair of parallel section of the tubular member. ### Claim 16 (depends on 15) The urea sensor protection assembly of claim 15, wherein the inner cage is spaced apart from a loop section of the tubular member.