A radiation based measurement system consists of 2 basic components: the source holder and nuclear detector. The source holder emits a pattern of gamma radiation that is sized to pass the vessel walls, and any other obstruction, the changing level of the measured product will attenuate the beam.
The detector measures the amount, or the presence or absence, of the radiation it received. A detector with an integral transmitter converts this amount into a useful analogue such as 4-20mA or Fieldbus Digital output proportional to a process variable such as level/interface.
This entry was posted
on Wednesday, July 16th, 2008 at 3:28 pm and is filed under Density, Information, Nucleonics, Principles of Good Measurement.
You can follow any responses to this entry through the RSS 2.0 feed.
You can leave a response, or trackback from your own site.
August 15th, 2008 at 4:45 pm
[...] http://www.aacblog.com/?p=315 - bookmarked by 3 members originally found by ja2 on 2008-07-22 Principles of measurement – Nucleonic Non Contact Continuous Level … [...]