Abstract: An apparatus for detecting change in the foam forming characteristic of an input stream of an aqueous solution which continuously samples the input stream by taking a series of discrete, independent measurements. A sample of the input stream is collected, analyzed, then discarded. The collect-analyze-discard cycle is repeated. The apparatus relies on an acoustic sensor to measure foam height within a column. This allows the column containing the foam to be fabricated from any material, including durable plastics. A sample of the input stream is introduced into the apparatus. The sample is then aerated by a aeration stone to produce foam. The height of the column of foam produced is then measured using the acoustic sensor. The sample is then discarded and the process repeated. The height of the foam column is correlated with the concentration of foam forming chemical.

Abstract: An apparatus including an enclosure having an interior surface and an exterior surface; a first radiation sensor coupled to the interior surface being configured to produce a first signal dependent on the radiation sensed by the first radiation sensor; a second radiation sensor coupled to the interior surface being configured to produce a second signal dependent on the radiation sensed by the second radiation sensor; and a bus accessible from the exterior surface, the bus being coupled to the first radiation sensor and the second radiation sensor.

Abstract: A nuclear level sensing gauge for measuring the level of product in a bin utilizes a bundle of scintillating fibers. A source of nuclear radiation positioned adjacent the bin, and a bundle of one or more scintillating fibers is positioned adjacent the bin opposite the source of nuclear radiation such that nuclear radiation passing through the bin impinges upon the bundle. Circuitry detects scintillating photons generated in the fibers, which are indicative of radiation passing through the bin. The number of photons generated in the fibers is representative of the level of radiation-absorbing product in the bin.