Results 1 to 2 of 2

Thread: Microwave Level Monitoring in Silos

  1. #1

    Question Microwave Level Monitoring in silos

    I am doing some research work on level monitoring in chip silos. My assigment specifies research mainly on microwave/radar* units. What I would like to know is if there any drawbacks with microwave level sensors, compared to ultrasonic or radioactive sensors? How accurate will microwave sensors be over a period of years? How good are absolute measuring errors on typical microwave units? (when applied to a typical dry bulk silo). Do all microwave sensors work in the same way? What shaped silo is ideal? The most accurate mounting place?

    Any replies are very welcome, as we are mainly looking for experienced results, not general data given from a manufacturer.


    Paul Davis - paulgodf@stud.ntnu.no
    Thomas Moldbrekke - moldbrek@stud.ntnu.no

    of the Norvegian University of Science and Technology

    *Some people say radar level sensors, others say microwave. We are doing research on sesors that work in the same way as radars do! (emitting microwaves e.g. between 9-26GHz)
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	ntnu_hovedlogo.gif 
Views:	239 
Size:	2.2 KB 
ID:	70  
    Last edited by silogjengen; 5th March 2003 at 14:23.

  2. #2

    Re: Microwave Level Monitoring in silos

    Originally posted by silogjengen
    I am doing some research work on level monitoring in chip silos. My assigment specifies research mainly on microwave units. What I would like to know is if there any drawbacks with microwave level sensors, compared to ultrasonic or radioactive sensors? How accurate will microwave sensors be over a period of years? How good are absolute measuring errors on typical microwave units? (when applied to a typical dry bulk silo). Do all microwave sensors work in the same way? What shaped silo is ideal? The most accurate mounting place?

    Any replies are very welcome, as we are mainly looking for experienced results, not general data given from a manufacturer.


    Paul Davis - paulgodf@stud.ntnu.no
    Thomas Moldbrekke - molbrek@stud.ntnu.no

    of the Norvegian University of Science and Technology
    Hi guys,

    the microwave sensors may be dangerous when used on wood chips. The chips will ignite because of the high effect radar.
    To avoid this it might be useful to let the wood chips flow through a water tank before adding them to the silo.

    Because the dielectric constant of water is so high, the measure of time will be non-accurate - so we recommend you to use the Doppler effect for measuring the level in the silos.

    The radar sensor should be replaced every 5 months.

    The silo should be conical for most accurate measurements.

    Regards,

    Steve Langley
    Senior Engineer at the Texas University

Similar Threads

  1. New Product for monitoring rotation/speed/rate w/alarm
    By HewTech Electronics in forum General Aspects
    Replies: 0
    Last Post: 13th November 2000, 15:55
  2. powder silos level measurements with ultrasonics
    By Marcos M. Pimenta in forum General Aspects
    Replies: 5
    Last Post: 13th November 2000, 15:40
  3. inserts in powder silos
    By Marcos M. Pimenta in forum General Aspects
    Replies: 1
    Last Post: 13th November 2000, 9:40
  4. Powder silos containing multiple inserts
    By Ian Whitlam in forum General Aspects
    Replies: 2
    Last Post: 13th November 2000, 9:35
  5. A/2000 Silos, Hopper, Bins & Domes Vols. I-IV
    By Author in forum General Aspects
    Replies: 1
    Last Post: 10th November 2000, 17:12

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO