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.
Related posts:
- Principles of Good Measurement: Ultrasonic Level Transmitters
- Principles of Good Measurement: Level Interface
- Principles of Good Measurement – Guided Wave Radar
- Principles of Good Measurement: Level Measurement
- Principles of Good Measurement: Level Switching
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