On-line microwave MR
113K moisture meter
The MR 113K moisture meter is designed for
the continuous moisture measurement of granular and powdered materials on
conveyor belts, in hoppers
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 transmitter and 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:
|
Range of moisture measurement . .
. . . 0,5-3% |
Basic measurement inaccuracy. .
0,15 %abs.; |
|
Range of moisture measurement . .
. . . 3-15% |
Basic measurement inaccuracy. .
0,5 % abs.; |
|
Range of moisture measurement. . .
. . 15-30% |
Basic measurement inaccuracy. .
1,0 % abs.; |
|
Unitized analogue output
(alternative) |
(4 … 20; 0-5; 0-20) mA |
|
Power supply |
=24 V or 110 or 220 V / 50 Hz |
The pictures demonstrate
the mounting of the sensors unit and microprocessor unit with an additional unit
of indication on one of the factories manufacturing kaolin in
The pictures demonstrate the mounting of the sensors unit on one of
the
factories manufacturing coke in
The moisture meter of coal is set on an inlet into a dryer and
measures
moisture of coal in the range of 8-16 %.
IDC Expertise Ltd is a
company registered in England, no 4149870.
Registered
of fice: Lionel House, 35 Millstone Lane,