Level sensor with alarm

Details Level sensor with alarm Level sensor with alarm

1990-09-18

1992-07-21

Isen, Forester W.

Communications: electrical

Condition responsive indicating system

Specific condition

340617, 340620, 73304R, 200 6121, G08B 2100

Patent

active

051326698

ABSTRACT:
An alarm system for use in a salt-brine tank of a water softener has a sensor including a stem member having a lower end received in the bed of salt within the salt-brine tank and an upper end projecting above the bed of salt. An spaced pair of electrodes are supported at the stem member upper end and are responsive to direct contact with a brine solution inside the tank for generating the signal indicative of an abnormal condition. An electronic circuit is coupled to the sensor for generating an alarm which includes two counters coupled to a clock circuit such that any alarm indicative of the abnormal condition is delayed for a predetermined period of time after the sensor signals the abnormal condition, and the alarm is generated as spaced, short bursts of sound, the spacing between the bursts of sound being greater than the duration of the bursts.

REFERENCES:
patent: 3102175 (1960-10-01), Eichenberger, Jr.
patent: 3392580 (1965-12-01), Bain et al.
patent: 3757134 (1973-09-01), Witener
patent: 3786464 (1974-01-01), Staempfli
patent: 4155082 (1979-05-01), Jones et al.
patent: 4263587 (1981-04-01), John
patent: 4600314 (1986-07-01), Theriault

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