Berthold Industrial Systems
Density Gauge LB 367
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Advantages of the Radiation Gauge
- Contactless continuous measurement using gamma absorption
- Easily fitted to existing pipeline or into container
- Independent of colour, temperature, pressure, viscosity, conductivity and chemical
properties of the product
- High long-term stability (+ 0.1%) achieved by automatic drift compensation
- Digital design from the beginning by using scintillation counters as a detector
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Some Practical Examples
- Concentration measurements: in the chemical industry for acids, alkalis and saline
solutions; in the food industry for sugar solutions, evaporated milk, chocolate, soup
seasoning etc
- Monitoring chemical conversions which result in density changes: eg. polymerization,
crystallization etc
- Solid content of liquids eg. sludge content in pipelines (extraction of ores or
minerals), bauxite content in lyes for aluminium production, monitoring the precipitation
of coal sludge in coal washing and sewage sludge in sewage plants
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| Clamp-on |
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Measuring Principle The
radiation emitted by a gamma source is attenuated as it passes through matter. This
absorption is an exponential function of measuring distance and density. If therefore, the
measuring path is constant, the attenuation of radiation is an indication of the product
density. A sensitive detector (scintillation counter) measures the residual radiation
and supplies a digital signal dependent on radiation intensity. The drift compensation,
incorporated in the scintillation counter, compensates for the effects of temperature
variation and component aging. This results in a high long-term stability of + 0.1%
relative to the gamma radiation intensity. |
| In-line |
| Radiation Source and Shielding In most
cases a 137 Cs source (half-life 30 years) is used as a radiation source. The actual
radioactive substance is double encapsulated in welded stainless steel. Each individual
layer is checked for leaks after welding. The source capsule has been tested by the
Federal German Bureau of Standards. It meets the highest safety standards (ISO C 66646).
The shielding container consists of a cast iron housing filled with lead. For very
corrosive environmental conditions, a housing made of stainless steel can be
supplied. Using the scintillation counter as a detector allows the use of low source
activities and small diameter radiation beams. Since the radiation is almost completely
absorbed in the scintillation counter, Radiation Protection Regulations are met in most
cases without any additional shielding. |
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The Compact Evaluation Unit
- Calibration possible with only one measuring point. The measuring signal is converted on
the basis of an exponential function.
- Calibration and data output are done directly in the selected unit to be measured:
g/cm3, concentration in %, concentration in g/l, concentration in şBe.
- Up to 10 calibration points can be used. This ensures problem free calibration, even
though the density is only constant for a short time.
- Easy input of further calibration points at a later time. All calibration data are
corrected by the decay compensation.
- Isolated current output and relay output as standard.
- Easy modification of the current range by entering the initial and final value.
- Automatic switching of the time constant, in the event of a rapid density change, with
adjustable response threshold.
- Automatic source decay compensation for 137Cs, 60Co and 241Am.
- Calibration parameters protected by a password.
- Measurement procedure can be stopped via an external contact. Interference caused by
emptying containers, flushing processors, etc. will be suppressed.
- Protection of the calibration data in an EE-PROM for at least 25 years without
additional battery.
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| S-shaped section for small diameter pipes |
Application Notes
for more information, email
SE Asia and Australasia: industrial@berthold.com.au
North America: usinfo@berthold.com.au
Europe: euroinfo@berthold.com.au
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