Berthold Industrial Systems

Level Gauge LB 323

Continuous Level Measurement

Advantages: noncontact, continuous level measurement independent of pressure, temperature and chemical properties of the product use of rod sources enables linearization of measuring signal even at the beginning of the measuring range adaptable for all shapes of vessel (cylindrical, conical, etc) simple to calibrate (only one measuring point is needed) source design for output signal proportional to product level or volume measuring range of several meters possible (more than 10 m) automatic decay compensation minimal source activity through the use of scintillation counters indication in % level or millimeters

Measuring principle Gamma radiation is attenuated as it passes through a medium. This attenuation is dependent on the type of source, the length of the absorption path, and the density of the medium. The type of source and the absorption path are constant in this case, meaning therefore that only the density medium can influence the measurement but from a particular absorption onwards has no practical effect on the measurement.

These characteristics mean that the radiometric level measuring system exhibits very high operational reliability, all chemical and almost all physical properties of the medium do not affect the measurement, and requires practically no maintenance.

This measuring principle can, therefore, be used under difficult operating conditions, eg. with high viscosity or highly corrosive products and in manufacturing processes operating with high pressures or temperatures.

Measuring arrangement The basic arrangement of a complete level-measuring system is made up of the following (see right): rod source with shielding container scintillation counter as detector connection cable between detector and evaluation unit level-measuring gauge LB 323
For special measurement tasks a point source and rod detector may be used (see right). Most measuring configurations are available to suit situational parameters, vessel shape, and measuring function. The illustrations below display a few examples.

Application data required We realise that the key to optimum level measuring system design results from finding the ideal solution to the problem while being aware of economic considerations. Full information about the measuring problem is, therefore, extremely important. The source activity necessary is dependent on the size of the required measuring range and the distance between the source and the detector, along with the thickness of the vessel walls to be irradiated.

To enable us to offer you assistance with your measuring problem, we require the following technical data:

1. type and dimensions of vessel
2. wall thickness and material
3. thickness and density of any insulation
4. size of required measuring range
5. density and any special properties of the medium in vessel
6. gas density under operating conditions in high pressure systems
7. speed of level variations
8. operating temperature at the detector

A sketch or drawing of the vessel showing the necessary data should accompany any inquiry.

Application Notes

• Cement Production
• Glass Production
• Sugar Production

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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