On-line microwave MICRORADAR113K moisture meter

 

The MR113K moisture meter is designed for the continuous moisture measurement of granular and powdered materials on conveyor belts. The devices are suitable for the measurement of a variety of materials, including alumina, aluminum oxide, coal, salts, minerals, sand, and other materials with intermediate to low moisture content (1 to 30%), and are easily incorporated into automatic process control systems.

The devices are appropriate for working on conveyor belts and in bins under the condition of high temperatures and dust content, high abrasiveness and aggressiveness of material.

 

How The Meter Works

The meter is installed with the transmitter and the receiver placed across the material under test. An electromagnetic wave is generated by the transmitterand passed through the material, and the receiver

detects the amount of electromagnetic energy absorbed by the water in the material. Despite the complexity of the physical structure of the material, there is usually a simple linear relationship between the moisture content and the amount of energy absorbed (at least in a limited range of moisture content). This relationship may be written in the form: N=8.7 AWrd

Where: N microwave attenuation by material,  A water absorption, W moisture content of material,

d thickness of material, r density of material. The moisture meter ensures self-acting correction of measuring results at a material temperature variation, has a current output and a serial port RS- 485 for data transmission to a computer. The device is produced in two modifications - for one-sided and two-sided installation. The sensors' signal is transmitted to a microprocessor processing unit, where moisture is evaluated. The value of moisture is displayed on a display diagram board of a microprocessor unit and is conversed to analogue outputs 4-20 mA and 0-5 V.

Through the channel RS485 moisture, temperature and the sensors' signals can be transmitted to the computer. The complete set of delivery of the device includes the program of storage and displaying of moisture real-time, that allows to enter into the computer, to watch, to store and to print the information on moisture for any span. A moisture measurement accuracy is from 0,15 % up to 1 %  depending on a moisture range considering inaccuracies of the sample choice and moisture measuring by a standard method, for example, by oven.

 

 

The basic technical characteristics: