М.: Издательство "Наука", 1977 - 400 с.
В книге даны основные теоретические и эмпирические уравнения, описывающие диэлектрические свойства жидкостей и использующиеся для расчета основных параметров (времени релаксации, коэффициента распределения времени релаксации, термодинамических функций и т.д.).
Мулёв Ю.В., Арефьев К.М., Беляева О.В., Мулёв М.Ю., Заяц Т.А.
Инженерно-физический журнал. Т. 84, № 5., 2011. – С. 912–916
Авторы статьи обосновали способ контроля степени сухости водяного пара на основе измерений диэлектрической проницаемости в условиях работы оборудования ТЭЦ и АЭС.
С любезного разрешения авторов статья выложена на нашем сайте.
М.: Издательство стандартов, 1972 - 413 с.
Книга представляет собой справочное пособие по диэлектрическим свойствам чистых жидкостей.
В ней дан краткий обзор теорий, описывающих диэлектрические свойства веществ, и анализ методов расчета основных дисперсионных параметров (времени релаксации, коэффициента распределения времен релаксации, термодинамических функций и т.д.).
Основные методы измерения диэлектрической проницаемости и диэлектрических потерь с указанием ошибок эксперимента.
Moisture meter for concrete-mixing machines
The moisture meter FIZEPR-SW100.17.X is designed for measuring the moisture (in percentage) of liquid and bulk materials. Its main purpose is measurement of water content in the concrete mixture directly inside the concrete-mixing machine, consistency and quality control of mixture agitation and its mobility.
How does heterogeneity of the material affect the sensor reading if I make a measurement of moisture? How does material size modulus affect the sensor reading?
Reply:
Due to the selected range volume of the material can be approximately represented as the sphere with a radius of about 25-30 cm. Therefore the heterogeneity within this volume is averaged. For accurate measurements size of material fractions should be approximately 10-20 times smaller than the wavelength. We use wavelength of about 1 m and if necessary it can be increased up to 7.5 m.
In what way calibration of your moisture sensor installed in the sand and gravel bunker is made? (By method of sample drying or by any other)?
Reply:
Calibration for the hopper and dispenser is performed using results of samples drying. The customer can independently change the calibration using results of his own measurements. Also there is the second way. It is possible to send you a calibration file prepared on the base of data received from you. This file should be installed on the moisture using supplied software and an ordinary PC.
The moisture meter connects to PC via RS485, and an adapter allowing connection of RS485 line to the USB port can be supplied in the package.
Information about calibration is also listed in the moisture meter operation manual.
Is temperature compensation provided in the moisture meter?
Reply:
There is a thermocouple inside the probe. Therefore all calibrations are referenced to the temperature.
It should be noted that the method of measurement used is based on permittivity measurement. And compared to attenuation measurements at microwave frequencies the results less depend on temperature.
How the measurement of moisture is performed? Does the sensor continuously measure moisture? Does it have an averaging algorithm?
Reply:
Moisture is determined by measuring permittivity in the metric VHF band. Moisture is measured regularly, about 1 time per second. The result is displayed as the average value of 5 measurements, but the user can optionally change the averaging base using the program for PC / Laptop.
Microwave barrier for level siur-03v
Whether in bulk solids or liquids – SIUR-03V detects the limit level with absolute certainty in very rough process conditions. The sensor is insensitive to dirt, dust and buildup.
