Plant low water alerting apparatus
First Claim
1. An alerting device for detecting a low-water condition in the container of a cut plant comprising:
- a housing having sensing means in its lower portion for sensing the absence of water and alarm means in its upper portion for producing an audible alert when the absence of water is detected;
wherein said sensing means and alarm means form a one-piece rigid structure; and
wherein sensing means and alarm means operating by electricity utilizing electrochemical battery means.
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Accused Products
Abstract
A self-contained apparatus detects the absence of water in a cut plant container and signals an audible alert. The alert sounds periodically until an attendant refills the water. The apparatus is a slender rigid structure that can easily fit inside a narrow vase of cut flowers. The top portion that remains above the normal water level holds the battery and electronic circuitry. The bottom portion, which rests against the container bottom, holds the water sensor. Various means of electronically distinguishing water from air are disclosed: thermal, vibrations, viscosity, density, acoustic, electromagnetic (including capacitance, microwaves, optical and beta rays), electrical contact, electrochemical, floats and pressure. The sensor has cavities in its structure to protect the sensor from handling, water damage and contamination. Some cavities are flooded having an opening above and below the normal container water level; the water inside a flooded cavity matches the water level in the container. Other cavities are dry to protect sensors and circuitry from water damage. Circuitry to detect the absence of water includes bridge circuits for variable resistance and variable voltage sensors. In addition, both self-impedance and mutual impedance circuits are disclosed.
27 Citations
20 Claims
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1. An alerting device for detecting a low-water condition in the container of a cut plant comprising:
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a housing having sensing means in its lower portion for sensing the absence of water and alarm means in its upper portion for producing an audible alert when the absence of water is detected;
wherein said sensing means and alarm means form a one-piece rigid structure; and
wherein sensing means and alarm means operating by electricity utilizing electrochemical battery means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification