Boots – shoes – and leggings
Patent
1984-06-19
1987-02-03
Gruber, Felix D.
Boots, shoes, and leggings
204408, 204416, 324438, 364550, 364571, G01N 2714, G01N 2746, G06F 1542
Patent
active
046412492
ABSTRACT:
An ion activity monitoring device is disclosed, having a semi-conductor device including an ion-sensitive field-effect transistor, for detecting the activity of ions in a liquid medium of interest, and a temperature sensor, for detecting the temperature of the liquid medium of interest, a constant current circuit for supplying a drain current of a particular value to the transistor, and a processing circuit for calculating the concentration of the ions in the liquid medium of interest. The drain current is of a value satisfying the relationship of .vertline.Id/.beta..vertline..ltoreq.0.10 volt.sup.2, wherein Id represents the drain current and .beta. represents the channel characteristic value of the ion-sensitive field-effect transistor. A method for operating the transistor is also disclosed.
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Gion Hidenori
Kubota Kenji
Nakamura Michihiro
Yano Makoto
Gruber Felix D.
Kuraray Co. Ltd.
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