SU1049794A1 - Device for measuring moisture content - Google Patents

Abstract

CONSTRUCTION FOR APPLIANCE HUMIDITY of bulk materials, containing a controlled thermostat with a primary converter placed in it, a capacitance meter. : whose input is connected to the output. the primary converter, and the display device, of which is 1D e e c,. by the fact that, in order to increase the sensitivity, in addition, a differentiating effort has been introduced. tal, the entrance of which is connected to vy-. care meter capacitance: - null-organ, the input of which is connected to the output. differentiating amplifier, and the output is connected to the thermostat's input, a controllable key, whose input is connected to the output of the capacitance meter g and the controlled input to the output of the zero-organ, and a storage device whose input is connected to the output of the controlled key, and output - with the input of the display device.

Description

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The invention relates to a measurement technique and can be used to measure the moisture content of various bulk materials.

A capacitive moisture meter for measuring the moisture content of various materials is known, for example, a moisture metering system for automatically controlling the moisture content of butter, consisting of a primary converter and a Ctii capacitance meter.

The disadvantage of such a system is the inability to change the temperature of the sample material placed in the primary transducer.

Closest to the invention is a device for measuring humidity, consisting of a controlled thermostat with a primary transducer placed in it, a capacitance meter, the input of which is connected to the output of the primary transducer, and a display device.

. The device. Works as follows.

The primary transducer with a sample of material is connected to a capacitance meter and placed in the vehicle. in thermostat. When the temperature in the converter changes, the capacitance changes, visually following the scale of the capacitance meter GZ j.

A disadvantage of this device is the low accuracy of the determination of humidity and the impossibility of using the device for automatic control.

The purpose of the invention is to increase the sensitivity of the measurement of moisture TC. . .

The goal is achieved. By the fact that a capacitance meter, the input of which is connected to the output of the primary converter, and the display device, were additionally introduced into the device for measuring the moisture content of bulk materials, which contains a controlled thermostat and a display device.

its input is connected to the output of a capacitance meter, a zero-organ whose input is connected to the output of a differentiating amplifier, and the output to an input of a controlled thermostat, a control key whose input is connected to the output of a measuring capacitance, and a controlled input of a zero-organ output and a storage device whose input is connected to the output of the controlled key, and the output to the input of the display device.

The drawing shows a block diagram of a device for measuring humidity.

The device consists of a controlled thermostat 1, a capacitive primary converter 2, a capacitance meter 3, a differentiating amplifier 4, a zero-organ 5, a control key b, a memory device 7 and an indication device 8.

The device works as follows.

The capacitive primary transducer 2 is filled with material to be tested and placed in a controlled thermostat 1. When the circuit is turned on, power is supplied to the thermostat, starting to heat the primary transducer with a sample of the material, which leads to an increase in its capacitance measured by the capacitance meter 3. When this controlled key 6 is closed. When the maximum of the capacitance corresponds to the maximum sensitivity of the sample, the signal at the output of the differentiating amplifier becomes zero, which triggers the zero-organ 5 to switch off the device, control the thermostat and open the control key, after which the maximum value of the capacitor in the storage device 7, is output to the display device 8; It is judged by this value about the humidity of the material being measured.

The device makes it possible to increase the sensitivity of moisture measurements 1.2-2.5 times for a wide class of bulk materials under laboratory and working conditions.

Claims (1)

¹ (541 (57) DEVICE FOR MEASURING THE HUMIDITY OF BULK MATERIALS, containing a controlled thermostat with a primary transducer placed in it, a capacitance meter,. * 'whose input is connected to the output. ι primary transducer, and an indication device, which requires that, in order to increase sensitivity, an additional differentiating amplifier is introduced, the input of which is connected to the output of the capacitance meter, ⁴ null-organ, the input of which is connected to the output 'differentiating amplifier,' output — with the input of a controlled thermostat, a controlled key, the input of which is connected to the output of the capacitance meter, and the controlled input with the output of a zero-organ, and a storage device whose input is connected to the output of the controlled key , but Exit - to the input of the indicating device.