Abstract: A pressure probe assembly for attachment to a venturi of a gas-fired appliance, where the venturi includes a body having an inlet end, an outlet end, and a wall defining a mixing chamber extending from the inlet end to the outlet end about an axis. A support member is detachably coupled to the mixing chamber. A first pressure probe is coupled to the support member and has a first pressure tap disposed substantially adjacent the axis. A second pressure probe is coupled to the support member and has a second pressure tap disposed substantially adjacent the mixing chamber wall. Also disclosed is a gas-fired appliance, such as a water heater, including the pressure probe assembly.

Abstract: In an exhaust-gas turbocharger for an internal combustion engine comprising an exhaust-gas turbine arranged in an exhaust strand of the internal combustion engine and a compressor arranged in an intake tract and connected to the exhaust gas turbine so as to be driven thereby, the compressor including a compressor wheel and a compressor housing surrounding the compressor wheel and having an inlet duct, a dynamic pressure probe is provided upstream of the compressor wheel in the inlet duct for measuring at least the total pressure in the air flow into the compressor.

Abstract: The present invention provides a flow meter comprising a microprocessor that calculates an applied irrigation amount for a time period for an area of an irrigated site. Additionally, the microprocessor determines a calculated watering requirement and a mathematical relationship between the calculated watering requirement and the applied irrigation amount. The flow meter further comprises an output device that provides information on the applied irrigation amount and the result of the mathematical relationship to at least one of an irrigation user and a third party. Preferably the calculated watering requirement is at least partly derived from ETo data. It is further contemplated that the microprocessor, disposed in the flow meter, will also detect, record and display flow anomalies. The flow anomalies may be due to power outages, flow meter malfunctions, and so forth.

Abstract: A method and apparatus for determining the efficiency of a liquid pump using air as a test medium. The method includes determining the total power output of the pump operated on air and determining the input power necessary to operate the pump on air. The input power is corrected for power differences resulting from operation of the pump on air rather than a liquid to obtain a corrected power input. The corrected power input is then divided into the power output to determine pump efficiency. The apparatus for performing the method includes a liquid pump arrangement temporarily connected to a bearing arrangement. The bearing arrangement is designed to support only the static load of the pump and the dynamic loads generated by operating the pump on air. This allows a bearing housing to be used that is smaller in size and less expensive to use. In addition, because the pump is operated on air, the components for feeding the air are less expensive as is the medium itself.