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Density Measurement
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The contactless and continuous measurement of the density of liquids or bulk material is requested in even more than the following applications:
- Concentration measurement of acid, alkali, saline solution and suspension
- Crystallisation and polymerisation monitoring
- Determination of the solid matter content in slurries, in flue gas desulphurisation suspensions, in aluminium production and in mining
- Measurement of the bulk density in washing powder and clinker
Measuring Principle
The density measurement operates according to the physical law of attenuation of gamma radiation, which is dependent from the radiation energy, the measuring path length and the density of the irradiated product. Through keeping the energy constant and since the measurement takes place in a pipeline, so the measuring path’s length is also constant, the attenuation is only dependent from the applicable density of the measured product. The radiation intensity, received from a sealed and shielded source is measured by a most sensitive scintillation detector and this measuring signal is then converted to a density or concentration measurement signal by the corresponding evaluation unit.
Dependent from the desired measuring range and accuracy and the products specification, the ideal irradiation angle is selected or a measuring path is used.
Nuclear measurement will not change the products being measured!
Measurement is independent of:
- Colour, viscosity, conductivity and most chemical properties of the product
Advantages
- Non-contact, continuos measurement of density or concentration
- Adaptable to all pipelines from 25 to 1000 mm
- Most simple installation on existing pipelines
- Measurement in vessels also possible
- Lowest source activity
- Automatic decay compensation
- High long-term stability due to electronic compensation of temperature and ageing influences
- On line measurement
- No moving parts
- Realiable technology
- Low maintenance
- Easy to calibrate
You will find successful applications of BERTHOLD TECHNOLOGIES density and concentration measurement systems in the following industries:
- Chemical Industry
- Petrochemical Industry
- Mining
- Power Plants
- Cement, Ceramics
- Food Industry
- Pulp and Paper Industry
- Steel Industry
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Arrangement 1
- Sealed and shielded source which will be mounted lateral to the pipeline
- Scintillation detector mounted opposite to the source container
- Clamping device or measuring path Two wire standard cable
- Evaluation unit with digital display and 0/4-20 mA analogue output of the density or concentration and alarm outputs
Arrangement 2
Especially if highest measuring accuracy is desired and the pipe diameter is rather small, the below shown measuring arrangement is used.
Arrangement 3
Flow Cell
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