Method and apparatus for determining the moisture content of different kinds of materials
US4019132A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1975 |
| Grant date | Apr 19, 1977 |
| Priority date | — |
| Expiry date | May 22, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/048
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for determining the moisture content of different kinds of materials wherein electrodes having a voltage supplied thereto are applied to the material to be tested for providing a measuring current corresponding to the moisture content of the material. The measuring current is applied to an amplifier having a low-valued input resistance and the moisture content is determined by adjusting a scale graduated in moisture values in accordance with the output of the amplifier. A balancing device is provided for balancing the output of the amplifier and the scale is connected to the balancing device to indicate a balance position as the moisture content value. The amplifier is also provided with a device for converting the measuring current to a voltage corresponding to the logarithm of change in current and a device for providing temperature compensation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.