Carbon monoxide indicator

Claim 1

AN INDICATOR FOR MEASURING CARBON MONOXIDE CONTENT IN A SAMPLE OF AIR COMPRISING A GAS RESERVOIR HAVING LOWER AND UPPER COMPARTMENTS, SAID LOWER COMPARTMENT BEING FILLED WITH WATER, ELECTRICALLY ENERGIZED PUMP MEANS IN COMMUNICATION WITH SAID LOWER COMPARTMENT FOR FORCING A SAMPLE OF AIR INTO SAID LOWER COMPARTMENT TO DISPLACE SAID WATER INTO SAID UPPER COMPARTMENT, A REACTION SYSTEM ADAPTED TO BE CONNECTED TO SAID GAS RESERVOIR FOR RECEIVING SAID SAMPLE, SAID REACTION SYSTEM INCLUDING A THERMISTOR-CATALYST BED FOR OXIDIZING THE CARBON MONOXIDE IN SAID SAMPLE AND FOR SENSING THE PERCENT CARBON MONOXIDE AS A DECREASE IN THERMISTOR RESISTANCE IN DEPENDENCE UPON TEMPERATURE RISE BROUGHT ABOUT BY OXIDATION, CONDITIONING MEANS INTERPOSED BETWEEN SAID RESERVOIR, AND SAID BED FOR RECUDING THE RELATIVE HUMIDITY OF SAID SAMPLE BELOW A PREDETERMINED VALUE, VALVE MEANS NORMALLY ISOLATING SAID REACTION SYSTEM FROM SAID GAS RESERVOIR, AND CONTROL MEANS INCLUDING A FLOAT SWITCH IN SAID UPPER COMPARTMENT FOR DE-ENERGIZING SAID PUMP MEANS AND OPENING SAID VALVE MEANS WHEN THE WATER IN SAID UPPER CHAMBER REACHES A PREDETERMINED LEVEL.