On Belt / Conveyor Microwave Moisture Measurement Technique
The MOISTSCAN MA-500 HD Series II’s result for moisture content is determined by measuring the effect that process material has on a microwave signal being passed through it. This signal is emitted from a transmitting antenna, housed in the lower arm of the frame which is placed under the conveyor belt. The signal is passed up through the process material and then detected by a receiving antenna, housed in the upper arm of the frame.
The microwave signal interacts with any moisture in the process material between the two arms. The degree of interaction is measured and used to derive a value for the amount of total moisture present.This amount of moisture is related to the total amount of process material on the conveyor to yield a measurement of total moisture as a percentage.
Health and Safety
The MOISTSCAN MA-500 HD Series II is designed to use low level microwave radiation. The microwave power emitted from the lower antenna is less than 10 mW (10 dBm). This radiation level is restricted to the region directly between the two antennae, which is normally inaccessible due to the conveyor belt. Microwave emissions are virtually undetectable further than 1m from the MOISTSCAN MA-500 HD Series II.
Dimensions (LxWxH)
1200mm x 550mm x 800mmincludes control cabinet
Unit mass
90kg
Shipping mass
150kg
Bolt size
4x 18mm
Bolt position
758mm x 500mmbetween bolt centres
Max conveyor belt width
1600mmstandard configuration however can be customised.
Max conveyor belt speed
N/A
Min material depth
user defined
Max material depth
500mm
Min material moisture
0%
Max material moisture
90%
Update time
user defined
Measurement accuracy
±0.3%
Measurement precision
±0.1%1 standard deviation
Ambient temperature range
-5 to 55ºCout of direct sun and weather
Max ambient humidity
90% relativenon-condensing
Supply voltage
110/240V ACsingle phase(60/50Hz)
Maximum Power Draw
300W
Inputs and outputs
2x 4-20mA analog outputsaverage moisture 1 and 22x 0-24V digital outputs 4x 0-24V digital inputs
