443010, Самара, ул. Галактионовская, 141.
ИНН 6315522386 / КПП 631501001
Р/сч. 40702810954390101485 в Поволжском банке ОАО «Сбербанк России» г. Самара
К/сч. 30101810200000000607, БИК 043601607
From the date of establishing in 1993, Design Bureau “Fizelektronpribor” has implemented more than 80 process automation projects at various Russian industrial plants. A lot of plants including foreign ones use our instruments.
Among our customers:
Design Bureau “Fizelektronpribor” has an experience of process automation in various industries. We have implemented automation control systems in chemical industry, at petroleum plants, building material factories and other productions.
Some of our projects:
Using of moisture meters with ceramic protective plates has led to loss of ACS dosing inert materials and water accuracy because of high irregularity of measurement results. What can you say about the accuracy of FIZEPR-SW100 during the measurement of bulk materials? Its operating principle? Its price?
As to the problems with the measurement of moisture using sensors you listed, sensors of their type have only surface layer of the ceramic plate as a measurement area.
It is easy to verify in the following experiment. Put a stack of sheets of paper or magazines that has a thickness of 1-2 cm on a ceramic sensor surface. This stack simulates the surface layer of the material. Then put your hand over the sensor and see how its readings change.
In order to avoid a mistake with amount of water, it is necessary to increase the volume of material analyzed. We performed several experiments: we took some samples of crushed stone and sand from different areas of the dispenser (this is easy to do: after opening the gate several samples of rolling sand and gravel were taken). Dosing unit volume is about 1 cubic meter. We have known that for sand and carbonate gravel moisture within this small volume can vary more than by 1% with an average moisture of 7.6% (moisture value was determined by drying).
As for the moisture meter FIZEPR-SW100, its measurement area includes material disposed between its probe and the hopper wall and also located in a cylindrical area about 20-30 cm in radius around the probe. The sensor with the flat-topped probe (nominal probe length - 24 cm) analyzes the area of about 20 liters. The direct probe (from one hopper wall to another) determines the average moisture at a significantly greater volume of about 1 cubic meter (depending on the size of the probe and the hopper).
The price of any version of the moisture meter for bulk materials is 68,971 RUB, including VAT.
Operating principle overview.
The probe (stick) is a half-wave TEM-wave resonator wherein the second conductor is the tank wall. The stick end is short-circuited because it is connected to the tank wall. Complex refractive index is determined using resonance frequency then permittivity and moisture (by calibrating tables) are calculated. The moisture meter controller includes calibrating tables for sand, carbonate rubble and granite gravel. The user can easily edit these tables if necessary. At that PC screen draws all data – diagrams of moisture dependence on the refractive index (or permittivity) for a temperatures set.