WATER CLEANING QUALITY INDICATOR Russian patent published in 1997 - IPC

FIELD: water preparation and water cleaning systems. SUBSTANCE: indicator has cleaned water chamber and starting water chamber communicated with atmosphere and separated by semi-permeable diaphragm. Chamber are connected respectively with cleaned water supply chamber and starting water supply chamber by means of valves. Cleaned water chamber is provided with measuring capillary whose diameter is equal to 1-3 mm with expander in its lower portion. Volume of starting water chamber exceeds total volume of cleaned water chamber and measuring capillary with expander by 3 to 10 times; total volume of measuring capillary with expander exceeds volume of cleaned water chamber by 1 to 5 times; volume of expander exceeds volume of measuring capillary by 25 to 50 times. EFFECT: enhanced sensitivity and possibility to conduct measurements in field of small difference of concentrations. 2 cl, 2 dwg, 1 tbl