INDICATOR, WATER CIRCULATION CIRCUIT INCLUDING THE INDICATOR, AND USE METHOD OF THE INDICATOR

PROBLEM TO BE SOLVED: To provide an indicator enabling adhesion of foreign matter to the inside of the constitution element (for example, the inside of a water heat exchanger) of a water circulation circuit with higher accuracy than conventional ones.SOLUTION: An indicator 100 includes: a float support member 2 of which at least a part is made of a transparent member, and that has an opposite surface having a clearance made wider from a lower part to be a water inflow side toward an upper part to be a water outflow side in an installation state; a float 1 that is movably provided in the float support member 2; a net member 3 that covers the upper side opening of the float support member 2; and a drain valve 4 that discharges water accumulated in the float support member 2.SELECTED DRAWING: Figure 1 【課題】水循環回路の構成要素内（例えば水熱交換器内）への異物の付着具合を従来よりも高精度に行うことが可能なインジケータを提供する。【解決手段】インジケータ１００は、少なくとも一部が透明部材で形成され、設置状態において水の流入側となる下方から水の流出側となる上方に向かって互いの間隔が広くなる対向面を有するフロート支持部材２と、フロート支持部材２内に移動自在に設けられたフロート１と、フロート支持部材２の上側開口部を覆う網部材３と、フロート支持部材２内に溜まった水を排出する排水弁４と、を備えたものである。【選択図】図１