Method and apparatus for measuring low concentrations of chlorin

Details Method and apparatus for measuring low concentrations of chlorin Method and apparatus for measuring low concentrations of chlorin

1978-01-09

1980-04-01

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

23232E, 338 34, C08B 1710

Patent

active

041964276

ABSTRACT:
A semiconductor sensor element having two filaments of a noble metal, preferably platinum, embedded in spaced apart relation in a body of titanium oxide. One of the filaments serves as a sensing filament. The other filament is supplied with current at a high voltage, suitably about 100 volts. The resistance of the sensing filament increases sharply in the presence of gaseous chlorine or chlorine compounds, and this change in resistance is used to actuate an alarm or the like.

REFERENCES:
patent: 3609732 (1971-09-01), Kasahara

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