SU136937A1 - Capacitive sensor for electronic moisture meter - Google Patents

Description

A capacitive sensor to an electronic moisture meter, placed in the flow of the test bulk material, is known, consisting of a dielectric plate in contact with this material, under which are placed capacitor electrodes that change the capacitance in accordance with the moisture content of the test material and included in the moisture circuit electronic circuit and devices for cleaning from the test material.

The proposed capacitive sensor to an electronic moisture meter, as compared with the known, improves the accuracy of measuring the humidity of hot bulk materials.

To this end, the sensor is equipped with a chamber blown with compressed air, covering the electrodes and connected to the dielectric lining; the dielectric lining is made in the form of an open chute facing upwards. The cleaning device is made in the form of a compressed air pipe attached to one of the ends of the chute. The sensor is equipped with a slide valve, which switches the supply of compressed air to clean the chute or cool the chamber, and a solenoid to actuate the slide valve, which is activated by contacts closed by a driving cam.

FIG. 1 shows a diagram of a capacitive sensor to an electronic moisture meter; in fig. 2 - electrical circuit diagram of the sensor.

The gutter 1 facing upward (lining) has a concave cylindrical surface of a dielectric sheet material; Under the chute 1 there are electrodes-plates 2 and 5 of the measuring capacitor, to which coaxial cables 4 5 from the electronic measuring unit are connected.

Electrodes plates 2 3 are searched by a casing 6

On one end side of the gutter / open, on the other opposite side there is a chamber 7 with a slit 8. concentric on top. No. 136937

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