G - Physics – 01 – N
Patent
G - Physics
01
N
340/139
G01N 27/04 (2006.01) G01K 7/24 (2006.01) G01N 27/22 (2006.01)
Patent
CA 1176345
ABSTRACT OF THE DISCLOSURE The invention provides a control arrangement for a humidity detector, the operation of which is based on a change of impedance of the detector, the detector being electrically heated under the control of said arrangement by means of a heating resistance to a temperature (Ts) which is higher than the ambient temperature (Ta) of the detector with a view to improving the accuracy of measurement of the detector or to increasing its life, said control arrangement comprising a bridge circuit or equiva- lent containing temperature-dependent resistance elements responsive to said ambient temperature (Ta) and said detector temperature (Ts), an error voltage of said bridge circuit being used as a feedback signal for controlling the electric heating of the detector,said heating resistance for the detector comprising a resistance element with a positive temperature coefficient which at the same time serves as a sensor of the detector's temperature, and said temperature-dependent resistance element responsive to said ambient temperature(Ta) comprising a resistor/ thermistor assembly enabling a function Ts = f(Ta) peculiar to each detector type to be realized with the aid of the control arrangement.
348669
Antikainen Veijo
Jalava Jouko
Salasmaa Eero
Marks & Clerk
Vaisala Oy
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