ABB AW101 Instruction Manual

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ABB AW101 Instruction Manual Manual pdf 4 page image

Water Hardness AnalyzerAW101 Testomat 1 General2 IM/AW101 Rev. C1 GeneralThe AW101 has been developed as a simple device to monitorthe quality of water from softeners. Applications includelaundries, utility boiler plants, soft drinks factories, brewing, foodprocessing and potable water plants. It provides an alarm forhigh hardness that starts an automatic regeneration of the ionexchange beds used most commonly in these applications.The AW101 uses one of four reagents that changes from greento red at a predetermined water hardness level. The reagent isadded to a known volume of sample via a small pump until acolor change takes place. The volume of reagent required tobring about this reaction (monitored photo-electrically) indicatesthe level of hardness of the water sample. The AW101 alsoprovides an analog signal, with a range determined by thechoice of one of the four reagents available.The digital display on the front of the monitor and the analogoutput show the value of the last analysis cycle.Three alarm outputs are provided – two concentration alarms forcontrol purposes and one alarm to drive an audible signaldevice. There are also inputs for a flow device and suspension ofthe flow cycle.1.1 Reagents Available for AW101The available ranges are determined by the choice ofappropriate reagents. A summary of the different possibilities areshown in Table 1.1.Parameter/Type of ReagentWater HardnessAW101901(TH2005)Water HardnessAW101 902(TH2025)Water HardnessAW101903(TH2100)Water HardnessAW101904(TH2250)Unit°dH(Resolution)0.05 … 0.50 (0.01) 0.25 … 2.50 (0.05) 1.0 … 10.0 (0.2) 2.5 … 25.0 (0.2)°F(Resolution)0.09 … 0.89 (0.02) 0.45 … 4.48 (0.1) 1.79 … 17.9 (0.4) 4.48 … 44.8 (0.4)ppm CaCO3(Resolution)0.89 … 8.93 (0.2) 4.47 … 44.7 (0.9) 17.9 … 179 (3.8) 44.7 … 447 (3.8)mmol/l(Resolution)0.01 … 0.09 (0.01) 0.04 … 0.45 (0.01) 0.18 … 1.79 (0.04) 0.45 … 4.48 (0.04)Table 1.1 Reagents Available for AW101Note. A consistently reliable result can only be guaranteed by the AW101 with the use of original ABB reagents. Failure orproblems which are caused by the use of different indicators are not covered by the warranty. When monitoring hardness, larger quantities of heavy-metal ions in the softened water can affect the color reaction,especially iron above 0.5 mg/l, copper above 0.1 mg/l and aluminium above 0.1 mg/l (brownish-red color indication).Measurement should be made within the range of 4 … 10.5 pH. At a concentration of more than 100 mg/l of CO 2 in the water, the excess must be removed by installing an appropriatedebubbler in the feed water line to the AW101 unit.