Soda lime half life indicator

Details Soda lime half life indicator Soda lime half life indicator

1981-06-23

1984-04-03

Recla, Henry J.

Surgery

Respiratory method or device

Means for indicating improper condition of apparatus

12820226, 55DIG33, 55DIG34, 73 29, 340540, 340588, 340604, 436 39, 436147, A62B 708

Patent

active

044401620

ABSTRACT:
The invention disclosed is an indicator for monitoring the capacity of a CO.sub.2 absorbent to absorb CO.sub.2. The indicator is typically used in association with a closed circuit breathing apparatus, including a container for a CO.sub.2 absorbent. The indicator comprises temperature sensing means immersed in the absorbent, a temperature to voltage converter for converting a sensed temperature reading to an electrical voltage signal, temperature trend processing means for processing said electrical voltage signal into a selected electrical output signal characteristic of a temperature trend; and display means for converting said selected electrical output signal to a predetermined visual display indicative of the capacity of the CO.sub.2 absorbent to absorb CO.sub.2.

REFERENCES:
patent: 3773044 (1983-05-01), Wallace
patent: 4046139 (1977-09-01), Horn
patent: 4108172 (1978-08-01), Moore, Jr.
patent: 4146887 (1979-03-01), Magnante
patent: 4151831 (1979-05-01), Lester
patent: 4273120 (1981-06-01), Oswell

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