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Microwave Sensor Applications

For Ironworks – COKE OVEN・CDQ

Microwave Sensor Applications

Coke Oven Level Sensor Milli-Ranger

MWS-79RFM-CH

The MWS-79RFM-CH type Range Finder was developed, first in the world, specifically for measuring the coal level in the Coke Oven. The sensor employs FMCW measurement method and FFT signal processing and consists of a controller and an antenna connected by coaxial cable. The sensor and antenna are removed from the high temperature area via the use of guidepipes.

Features

  • Unaffected by adverse conditions
    Milliwaves are unaffected by temperature, flames, vapor, airborne particles or dirt.
    Even if dust accumulates in the guidepipe or adheres to the lens of the antenna, measurement will not be affected.
  • High accuracy and reliability
    Stable measurement even when the surface of the coke is sloped.
    Employs the rotary microwave technique in spite of the large frequency sweep: false measurements caused by double-reflected waves are eliminated through the use of rotary microwaves.
    Due to the high S/N ratio, the sensor provides stable measurement even when the reflection from the target [coal] is very weak.
    The adaptation of 79GHz high frequency enables the sensor to use a smaller size antenna and measure in small spaces.
    ±30 mm accuracy on the coke surface.
    Utilizes filters that eliminate spurious signals.
  • High speed response time
    The MWS-79RFM-CH responds 4 times faster than WADECO’s standard Microranger. Therefore charging coal into the coke oven can be swiftly achieved with improved accuracy.
  • The operational state is shown on your personal computer
    It displays a FFT spectrum, the received signal and various preset values.The received signal, FFT spectrum and the measurement trend are continually displayed. This displayed data can be recorded and reviewed in real or accelerated time.
    Use of the recording and reviewing capabilities allows the system parameters to be optimized offline.
    The display indicates and the controller outputs the internal temperature and any abnormal conditions (i.e. a lowering of received signal power, rising temperature in the controller or communication failures).
  • Convenient built-in functions
    A reference point and the required range are easily preset.
    Compatible for use with a personal computer.
    Power supply range of 90 ~ 240V, 50/60Hz.                                                                                                                                                        Use of RS-485 allows communication between one computer and multiple controllers.
    4-20mA, analogue output.
    RS-422 digital output terminals (distance, receiving power level, temperature and alarm).
  • Lightweight and compact
    Portable (controller: approx. 6kg).
    Easy Installation.
  • Easy Maintenance
    Easy maintenance because the reflector and the antenna can be installed in the open space.
Milliwave Range Finder milli-ranger MWS-79rf
catalog (PDF)

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