Tralee Institute of Technology Dissolved Oxygen level testing The property for dissolved Oxygen (D.O) level testing was a three bedroomed semi detached house in the Tralee area built circa 1900 of stone construction without wall insulation, with a 150 mm wool fibre insulation in attic areas and a mix of double glaze PVC and single glaze timber windows and external doors. The D.O. was tested by taking small samples at regular intervals from the flow to the radiators and testing the water immediately using an WTW Oxy 96 D.O. meter capable of reading to 0 PPM (Parts per Million). To ensure accuracy of D.O. measurements the samples were cooled to 40°C. Problems such as non uniform heating of radiators, corrosion of radiators, air pockets causing poor hot water, knocking of pipes an

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