Microwave Technology Measure Moisture Analyzer Manual

Microwave Technology Measure Moisture Analyzer Manual

Microwave Moisture Analyzer works on the principle that water has a very higher dielectric constant compared to most other materials.

When microwaves interact with water molecules within the material they slow down (and hence change phase) and weaken (attenuate) as the energy is transferred to the water.

A low profile antenna transmits a beam through the material on the Conveyor Belt. The signal is received by a receiver antenna located below the conveyor belt. The Microwave Moisture Measurement received signal is compared to the transmitted signal for phase and amplitude change. See figure below.
Both the change in phase shift and attenuation is measured and processed by the control unit to calculate the moisture content of the material measured.

Since phase shift and attenuation is dependant and influenced by the amount of material to be measured (% moisture by weight), a measurement of the mass loading on the belt is required to compensate or “normalise” the microwave measurements. The mass, profile or height measurement is provided by use of belt weighers, radar level, ultrasonic level, radar scanners etc, or even a combination of these devices. In some cases the density of the material is measured using a Nuclear Type Density Transmitter.

Another technology that is used for online moisture measurement is NIR (Near Infra Red) which is limited in the fact that it only measures surface moisture and does not penetrate the whole burden of material. In Dust Extinction Moisture (DEM) applications where the moisture is measured immediately following sprayers, the Online Moisture Measuring reading will be biased to read high moisture which is true for the surface but not for the whole burden of material.

Features

■ Non-contact measurement: Moisture Measuring System without abrasion and interference, less maintenance.
■ Measure total moisture: Penetrating material and representative is better.
■ High anti-interference ability: without interference of environment dust, steam and vibration.
■ Not affected by material color, temperature and particle size.
■ Rapid and real-time measurement results: the sampling rate can reach to the microsecond level.
■ Wide range of applications: almost all (non-conducting) substances.
High security: Low emission energy, without radioactive nuclear sources.

Technical Parameters

Model		MA Ⅰ	MA Ⅱ	MA Ⅲ
Accuracy		0.5%～1% （1σ）	0.3% ～ 1%（1σ）	0.5%～1% （1σ）
Display mode of measurement result		Water content value (in percentage)
Response time		≥1s (user settable)	Corresponding to each box	≥1s (user settable)
Analog output		4～20mA (one way in case of standard configuration)，±0.2% indication error
Ambient temperature		-20 ～ +60℃
Level of Protection		IP65
Power supply		220V AC ±10%，50/60Hz
Power consumption		50W
	Display	5.7 inch 640*480 graphical dot-matrix，65K TFT touch control LCD (Integrated on the host）

Application
MMA applies to a diverse range of materials, such as online moisture detection in coal, timber, sugar, bagasse, sand, chemical produce, etc.
■ Common materials: coal, fertilizer, sand, etc.
■ Steel industry: sintering mixture.
■ Textile industry: fiber bundles, cotton bags, etc.
■ Grain: wheat, rice, grain, corn, sorghum, grain, field crop, feed, etc.
■ Bio-fuels: bagasse, wood dust, wood chips, sawdust, etc.

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Product Categories : Microwave Moisture Analyzer