House plant water content indicator

Details House plant water content indicator House plant water content indicator

1975-02-12

1976-04-20

Swisher, S. Clement

Signals and indicators

Alarms

Fluid flow

73 73, G01N 2556

Patent

active

039510980

ABSTRACT:
An indicator device is provided for insertion into the potting soil of a conventional house plant, for monitoring the moisture content thereof. The indicator includes a plastic housing encapsulating an elongated wick extending from a lower point where it is exposed beneath the soil level thereof to an upper point in an indicator chamber formed in the housing. The wick surrounds but does not touch a "signal element" comprising a layer of moisture-sensitive, color changeable substance (e.g., cobalt chloride), to carry moisture to the vicinity of the "signal element". The substance changes color in response to predetermined gains (or losses) in moisture content. Included in the housing structure are a plurality of vents adjacent the indicator chamber for precisely regulating the rate of evaporation therein, to control the response of the indicator to the moisture changes in the soil being monitored. The housing is advantageously comprised of opposed peripherally sealed moisture impervious walls, preferably both transparent, which generally enclose the wick and color change substance and define the overall shape of the indicator device.

REFERENCES:
patent: 3019638 (1962-02-01), Klein
patent: 3824844 (1974-07-01), Strickland

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