A fluid sensor which can perform detection of a refrigerant leakage, includingspecifying of which part of a refrigerant circuit of a refrigeration device hasthe refrigerant leakage. The fluid sensor (8) is a fluid sensor for detectingleakage of a refrigerant from a refrigerant circuit (10). The fluid sensor (8)has a sensor body (8a) having two electrodes (81, 82) arranged at an interval andis adapted so as to be connectable to an impedance measurement device (9) for measuringthe impedance between the two electrodes (81, 82).
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