COOLANT CORROSIVENESS INDICATOR

摘要

A fluid sensor for heat exchanger system includes a supporting device such as a tubular hose fitting for mounting the sensor in the system so that heat exchanging fluid circulated in the system comes into contact with the sensor, A window or sight glass is mounted in or on the supporting device and a visual indicator is visible through the window or sight glass. The visual indicator can be a movable flap. The indicator is movable from first position indicating that the heat exchanging fluid is in a non corrosive state to a second position indicating that the fluid has become corrosive to at least a limited degree and requires replacement or treatment. A corrodible release mechanism holds the indicator in the first position and is located so as to be immersed in the heat exchange fluid during use of the sensor. The release mechanism corrodes and breaks when the fluid becomes corrosive to at least a limited degree, thereby releasing the indicator so that it moves to the second position.