Method for testing a turbidity sensor
US5757481A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1995 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Nov 17, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/534
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is provided to test turbidity sensors using a solid block that is particularly formulated to have a predetermined turbidity value. The solid block, which is partially transparent, is made by mixing calcium carbonate with a clear acrylic. A plurality of sample sensors are selected to be used as an intermediate standard to correlate the results achieved when the block is tested to results that would be achieved if liquid turbidity samples are tested. The six sample sensors are used to measure the turbidity of a plurality of liquid samples. The six sample sensors are then used to test the solid block in order to make sure that the turbidity represented by the solid block is within an acceptable range that is normally dictated by either a national standard or a particular customer requirement. Each of the plurality of sample sensors is used to test the solid block a plurality of times to form an average ratio value that can be used as a first representative magnitude for each of the sample sensors. After ignoring the highest and lowest magnitude from the sample sensors, the remaining magnitudes are averaged to achieve a second representative magnitude that can be used in compa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.