SU1571493A1 - Apparatus for measuring moisture content of loose material in the flow of heat-transfer medium - Google Patents

Abstract

The invention relates to a measurement technique and can be used in continuous measurement of the moisture content of a bulk material in a heat carrier stream and in automating processes with regulation of humidity conditions, for example, in the production of coniferous vitamin and grass meal. The aim of the invention is to improve the measurement accuracy by compensating for measurement errors caused by temperature fluctuations. Exemplary and working primary transducers are placed in the bulk material moving in the coolant flow. As the working primary converter fills with bulk material, the signal from the strain gauge density sensor enters the comparator and when the specified density level is reached, the comparator output enters the computing device, where the signals from the model and working primary converters are received through autogenerators and converters. The moisture content of the bulk material in the coolant flow is calculated as the ratio of the electrical quantities of the working and sample primary transducers. 1 il.

Description

sd 1

The invention relates to a measurement technique and can be used in the continuous measurement of the moisture content of a bulk material in a heat carrier stream and in the automation of processes with the regulation of humidity conditions, for example, in the production of coniferous-vitamin and grass meal.

The purpose of the invention is to improve the measurement accuracy.

A device for measuring wet- and tangible bulk material in a coolant flow contains an exemplary primary converter 1 equipped with a pressure-tight lid 2, a working primary converter 3, autogenerators 4 and 5, frequency converters — voltage 6 and 7, a computing device 8, a strain gauge 9 density sensor , adjustable comparator 10, cleaning device 11.

A device for measuring the moisture content of the bulk material in the coolant flow works as follows.

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An exemplary primary transducer 1 filled with bulk material of known humidity and density and closed with a sealed lid 2, and a working primary transducer 3 placed in a heat carrier stream with a bulk material moving in it are included in the frequency-setting circuits of the corresponding autogenerators 4 and 5, which are output through transducers - Voltage 6 and 7 are connected to the corresponding inputs of the computing device 8. As the working primary converter of the Ivater 2 is filled with the bulk material, the signal with a metric density sensor 9 is fed to the input of an adjustable Comparator 10 and when a predetermined density level is reached from the output of the separator, it goes to the control input of the computing device 8, which gives an enabling impulse ta to the production of humidity, and, for some time, it takes the time to measure cleaning device 11. When returning the piston of the cleaning device 11 to its original position, the measurement process is 9

nor is it repeated in the same sequence. The moisture content of the bulk material in the coolant flow is calculated by device 8 as the ratio of the electric capacitances of the working primary converter 2 and the model primary converter 1.

Claims (1)

Invention Formula A device for measuring the moisture content of the bulk material in the coolant flow, containing working and exemplary capacitor type converters, included in the frequency-setting circuits of the corresponding autogenerators, the outputs of which are connected through the frequency-voltage converters to the corresponding inputs of the computing device, characterized in that to improve accuracy, the working primary converter is equipped with a strain gauge density sensor and a cleaning device, and the output of the density sensor is An adjustable comparator is connected to the control input of the computing device. eleven