Liquid quality checking device and liquid storage tank provided with the device

摘要

A deterioration checking device (2) includes a sight glass (3) through which deterioration of a biofuel stored in a fuel tank is observable as a change in the color of the biofuel, and first and second benchmark sections (4a, 4b) each of which three color samples (11a, 11b, 11c) corresponding to different degrees of deterioration of the biofuel are arranged along the sight glass (3). Deterioration is determined by observing the color samples (11a, 11b, 11c) through the biofuel in the sight glass (3). The arrangement of the color samples (11a, 11b, 11c) of the first benchmark section (4a) and that of the color samples (11a, 11b and 11c) of the second benchmark section (4b) are reversed to each other, so as to cope with the lowering of the liquid level of the biofuel and the rising of the liquid level of a water layer.

主权项

1. A liquid quality checking device comprising:
an observation window that is attachable onto a liquid storage tank and extends in a vertical direction along which a liquid level of a liquid stored in the liquid storage tank changes, the observation window permitting a change in quality of the liquid to be observed as a change in color of the liquid; and
first and second benchmark sections that are placed close to the observation window, each of said first and second benchmark sections having a plurality of color samples, corresponding to a plurality of different quality degrees of the liquid, arranged along the observation window; whereinin the first benchmark section, the color samples are arranged along the observation window in order of specific stages through which deterioration of the liquid quality progresses, andin the second benchmark section, the color samples are arranged along the observation window in order reverse to the order of the color samples of the first benchmark section.