Abstract: An improved total dissolved gas pressure collector has a high ratio of surface area to internal volume and is configured in a compact unit which still permits good fluid flow across it. The module forms part of an improved gas sensor package having high sensitivity (e.g., less than 0.1 mm Hg, preferably less than 0.05 mm Hg) and rapid response times (e.g., less than 5 minutes to 99% of equilibrium, preferably less than 2 minutes to this value). The module comprises: a base having an opening therein; a resilient fitting in said opening in the base; a plurality of upstanding capillary tube supports; an elongated, gas-permeable capillary tube having defined internal volume and defined external surface area, the tube being closed at one end which is secured to one of the supports and having one end adapted to communicate with a total gas pressure transducer through the resilient fitting. Also provided are an acquisition and analysis system including the module, and a method for making the improved module.

Abstract: A probe is disclosed for use with a dissolved gas meter, which is capable of measuring the concentration of dissolved gas in a fluid by measuring the permeation of gas through a membrane into an electrolyte solution. The probe includes an inner member, preferably tubular, disposed inside an outer member, preferably tubular, each tubular member having an open top end. Preferably, the inner tubular member and the outer tubular member are coaxially located such that an annular space is formed between the inner and outer tubular member. The probe further includes a plurality of electrodes operably connected inside the probe to the meter. A counter electrode extends into the central chamber of the inner tubular member, along the central axis. A working electrode is wrapped around the outer tubular member. A reference electrode is wrapped around the inner tubular member.

Abstract: An apparatus for receiving signals in the form of strikes from fish to control the operation of a scatter-type feeder to feed the fish in response to the fish strikes. The apparatus transforms vibrations of strikes by even the tiniest of fish into electrical signals which may be amplified and analyzed by control circuitry to control the operation of the scatter-type feeder. In operation, the circuitry effectively controls the amount of feed dispensed per batch by the feeder, causes a delay time (a pause) to follow after the dispensation of one batch before it is possible for strike signals to initiate the dispensation of a second batch and requires the strike to be one of a specified magnitude before food is dispensed. Each of these controls is adjustable by knobs on a control box.