System for controlling drain system treatment using temperature

Details System for controlling drain system treatment using temperature System for controlling drain system treatment using temperature

1990-07-23

1992-02-25

Dawson, Robert A.

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

210 85, 210104, 210139, 210143, 2101981, 210744, 210752, 222 54, 222 66, 417 12, 417 18, C02F 100

Patent

active

050910957

ABSTRACT:
Automatic treatment of a drain system is provided by the controlled injection of a bio-active liquid at established intervals into the drain system. A container of the treatment liquid is provided with a pump coupled between the container and the drain. Fluid level sensing means is located in the container and fluid temperature sensing means is located in the drain system. When the temperature is within range and the fluid level is sensed, the pump is periodically operated to inject a quantity of fluid directly into the drain system without operator control.

REFERENCES:
patent: 4113617 (1978-09-01), Bereskin et al.
patent: 4539109 (1985-09-01), Davis
patent: 4676403 (1987-06-01), Goudy et al.
patent: 4797208 (1989-01-01), Miller et al.
patent: 4830757 (1989-05-01), Lynch et al.
patent: 4897797 (1990-01-01), Free et al.
patent: 4913625 (1990-04-01), Gerlowski
patent: 4940539 (1990-07-01), Weber

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