Patent ID: 7802861

Claim:
A liquid detector comprising: a case, having an opening through which a flow channel is exposed; a sensor base, having a first surface facing the flow channel through the opening, and having a second surface opposite to the first surface; a sensor chip, mounted on the second surface of the sensor base; a film, adapted to hold the sensor base in the opening, and adapted to seal the opening; and a partition wall, dividing a part of the flow channel in the case into an upstream buffer chamber and a downstream buffer chamber, wherein the sensor chip includes a sensor cavity adapted to receive a liquid to be detected, the sensor base has: a first hole through which the liquid is introduced from the upstream buffer chamber to the sensor cavity; and a second hole through which the liquid is introduced from the sensor cavity to the downstream buffer chamber, and during liquid detection, the first and second holes are arranged in parallel at the same height in a vertical direction, the partition wall is arranged between the first and second holes so as to extend along the sensor base in the vertical direction, and a bottom bypass is formed at a lowermost position in the vertical direction of each of the upstream and downstream buffer chambers to communicate the upstream and downstream buffer chambers with each other.