on-line moisture measurement of conveyor belt

On-line Conveyor Belt System

MS1510 Moisture Transducer

____Solution for On-line Moisture Measurement for Powder and Grain Applications

Ref：sMS1510IntE

Date:2006-03-26

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The MS1510B Microwave Moisture Monitor allows accurate measurement of moisture in real time using a microwave moisture technique. This technique is applicable to a wide range of conducting materials including coal, bauxite, wood flake, sugar, bagasse, mineral sands, food, chemicals and others.

The Microwave Moisture Measurement Technique.

The moisture content of the material is determined by measuring the transmission of a microwave beam through the process material. This beam is emitted from a transmitter located in one side of sample, always at the lower arm of the System Frame located under the conveyor belt. The transmitted microwave signal is detected by the receiver located in another side, always at the upper arm of the System Frame. The effect on the microwave signal by the material it passes through is recorded and used in the determination of the moisture content.

Flow Density Compensation embedded

l Flunctuation of flow rate heavily influence the detect results in this technology. It always needs a certain way to monitor the cross density of the sampling flow as well, so that the exact moisture result could be calculated on time.

l There are 3 density rectifying technology can be selected by user application situation.

l For sample space and flow stable conveyor, vonveyor speed test can be used

l Conveyor bottom is smooth sliding, US distance test can be used

l Unstable conveyor,flow system, g-ray density transducer must be choosed.

Applications

l Continuosly measurement of moisture in the sand, concrete, calcareous sandstone or glass industries

l Determination of the moisture of coke and sinter mixtures

l Other solid/powder industries

Advantages

l Rapid realtime results

l Continuous measurement of moisture content on-belt frame construction
Non contact technique, simple installation in or on existing tanks or vessels

l Independent of the temperature, pressure, pH value and color of the material

l Large measuring volume, ensuring a better, more representative measured value

l User set up

Benefits

l No segregation effects and low cost, straightforward installation

l No wear problems, low maintenance

l Allows proactive process control

l No costly sampling program and no operator intervention

l Elementary commissioning and "Two point" calibration

System Description

Measurement Frame

The measurement On-belt frame houses the measurement systems - the microwave transmitter and receiver. The measurement systems are accurately aligned during the manufacturing process which means that there is no need for lengthy setting up on site. The Measurement Frame is normally arranged so that these measurement systems are aligned with the centre of the belt. The Measurement Frame is designed to fit directly to the conveyor stringers.

The lower arm of the Measurement Frame contains the microwave transmitter. The upper arm of the Measurement Frame contains; the microwave receiver, the microwave electronics as well as STIM processor.

Electronic Transducer

l The standard MS1510B is supplied with the Electronics Control Cabinet mounted on the Measurement Frame. This cabinet contains electrical, electronic and microwave hardware which consists of:

l STIM Processor
Power supplies.
Electrical terminations.
Microwave Components
Display Panel and terminal.

Specifications

Operational
Conveyor width	Up to 1400mm as standard (more than 1400mm requires customised Onbelt frame)
Conveyer Speed	No limit
Material Top Size	Typically up to 500mm (material dependent)
Bed Depth Range	Typically 20mm to 500mm ((material dependent)
Moisture range	0 - 80%
Measurement Update Time	Typically 1 minute (user configurable, dependent on process requirements)
Instrument precision	Typically 0.3% at 1 standard deviation (ultimate precision achievable 0.1%)
Electrical Requirements
Field Unit (Independent system)	24V DC, Max < 300W supply
Remote Controller (Optional)	220 or 110 V ACt, single phase, <2 amp supply
Environmental Requirements	IP65
Operating temperature range	0 to 45°C with protection from direct sun and rain
Humidity	0 to 95% relative (non-condensing)
Outputs
Instantaneous moistures	Isolated 4 to 20 mA current loops indicating the rolling average of moisture content over any accumulated time period.
System running	Relay closure indicating that no alarm conditions exist
Shipping mass	150 kg

For more special solid/powder moisture mearurement application system,please refer to sMSpowdIntE “Solution for Powder Moisture Test Applications”