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Microwave Measuring System, LB 356-456 Micro-Moist Moisture Content in Coal is an important parameter: Preparation-Regulate Moisture Content Handling-Dust-Ice Transport-Weight Trading-Weight Calorific Value 5

Microwave Measuring System, LB 356-456 Micro-Moist Microwave Transmission Techniques are the most accurate method of determining moisture content of Coal Attenuation/Area Weight Phase Shift/Area Weight Phase Shift and or/Attenuation 6

Microwave Measuring System, LB 356-456 Micro-Moist Attenuation measurement can provide accuracy up to 1wt% moisture Temperature dependence error Bulk Density dependence error Particle size dependent error Conductivity dependent error 7

Microwave Measuring System, LB 456 Micro-Moist Phase Shift Measurement: or (Combined Attenuation and Phase Shift) Independent of Temperature of Coal Independent of Particle Size variations INTEGRAL Area Weight Compensation Accuracy of 0.2 wt% moisture achievable 8

9 Principle of Operation Microwave Measuring System, LB 356-456 Micro-Moist Principle of Operation 9

Microwave Measuring System, LB 354-356-456 Micro-Moist The choice of 2.7-3.4 GHz frequency range: Measurement of bulk, not surface. This provides a representative measurement The temperature coefficient of free water crosses zero at 3 GHz Attenuation due to ionic conductivity (salt content,…) is reduced at higher frequencies Frequency analysis over the frequency range provides phase measurement greater than 360 deg with plausibility control 10

Microwave Measuring System, LB 356 Micro-Moist 11

Microwave Measuring System, LB 356 Micro-Moist Coal Preparation Plant: 12

Microwave Measuring System, LB 356 Micro-Moist Coal Preparation Plant management reported precision of 0.4% moisture (one sigma RMS) 13

Microwave Measuring System, LB 456 Micro-Moist Product Improvements: Reference cable can be replaced by short link if To constant PT-100 Temperature Compensation with direct connection Detector to Evaluation Unit uses FSK (Frequency Shift Keying) 14