Apparatus for determining the concentration of a chemically active gas in an atmosphere

Claim 1

A UNITARY, ELECTRICALLY OPERATED APPARATUS FOR AUTOMATICALLY DETERMINING AND RECORDING THE CONCENTRATION OF REACTIVE AGENTS IN AN ATMOSPHERE, WHICH COMPRISES AN ABSORBENT PAD, AN ELECTRICALLY DRIVEN FAN FOR DIRECTING A STREAM OF SAID ATMOSPHERE AGAINST SAID PAD, ELECTRICALLY DRIVEN MEANS FOR MOVING SAID PAD THROUGH SAID STREAM OF ATMOSPHERE, THEREBY EXPOSING THE SURFACE OF THE PAD THERETO FOR A PRE-DETERMINED INTERVAL OF TIME, CAPILLARY MEANS FOR CONTACTING SAID PAD AND MOISTENING IT WITH A LIQUID THAT IS REACTIVE TO SAID REACTIVE AGENTS, SAID CAPILLLARY MEANS BEING LOCATED IN THE PATH OF TRAVEL OF THE PAD PRIOR AND ADJACENT TO ITS POINT OF EXPOSURE TO THE STREAM OF ATMOSPHERE, A DRYING CHAMBER LOCATED ABOUT THE PATH OF TRAVEL OF THE PAD SUBSEQUENT AND ADJACENT TO ITS POINT OF EXPOSURE TO THE STREAM OF ATMOSPHERE, AND MEANS FOR SUPPLYING A STREAM OF HOT, DRY ATMOSPHERE TO SAID DRYING CHAMBER, SUCH MEANS INCLUDING AN ELECTRICAL HEATING DEVICE AND A FILTER LOCATED IN THE PATH OF THE STREAM.