DEVICE FOR MONITORING MOISTURE CONTENT Russian patent published in 2012 - IPC G01N27/22 

FIELD: physics.

SUBSTANCE: device has a capacitive sensor (1) which is immersed in the controlled medium, which consists of two pairs of coaxial cylindrical electrodes (2 and 3), one of which (2) is filled with oil which does not contain moisture. A rectangular electric pulse is transmitted to the first electrode of the sensor (1) from a test signal (5) generator. Responses of the sensor (1), which are picked up from the second (external) electrodes, are detected by peak detectors (6 and 7) whose output signals are transmitted to a differential amplifier (8). The output signal from the differential amplifier (8) is transmitted to the input of a unit for determining moisture content (9). That unit (9) has a comparator (10), one of the inputs of which is connected to a reference signal source (11). The input signal from the unit for determining moisture content (9) is transmitted to a microcontroller unit (12) which filters the comparator (10) signals. Upon persistent generation of the signal for exceeding the moisture content level of the controlled oil, the output stage (13) is switched by the microcontroller unit (12) to a state signalling that the level has been exceeded.

EFFECT: broader functional and operational capabilities of the device, simple measuring technique, high measurement accuracy, reduced probability of the effect of stray parameters of electrode circuits on sensitivity of the measuring circuit, possibility of using the device as a signalling device for the critical level of moisture content of oil.

3 cl, 1 dwg