Fast response and accurate temperature measurement of a hydraulic fluid

A system for sensing a temperature of a fluid within a hydraulic vessel, the system comprising:

• a temperature sensor;
• a barrier wall having a first surface thermally coupled to the temperature sensor, and a second surface, opposite the first surface, configured to directly contact the fluid within the hydraulic vessel;
• and
• a vessel connector configured so as to present the second surface of the barrier wall to the fluid within the hydraulic vessel via an aperture in a vessel wall extending between an exterior surface of the vessel wall to an interior surface of the vessel wall, an aperture volume defined between a first surface extending the exterior surface of the vessel wall so as to span the aperture and a second surface extending the interior surface of the vessel wall so as to span the aperture, the vessel connector further configured to circumferentially seal the hydraulic vessel about the aperture,
• wherein the barrier wall has an annular recessed portion circumscribing a projecting portion, the annular recessed portion configured to form, when coupled to the hydraulic vessel via the vessel connector, an annular recess into a portion of the aperture volume, the projecting portion projecting from the annular recessed portion in a projection direction substantially perpendicular second surface, a cavity being formed by a first-surface of the projecting portion of the barrier wall within which the temperature sensor is located.