Measurement arrangement of EmulsionSENS and the resulting density profile
- Sources and detectors at same height
- Output: Density values of each detector
- Very precise point information
- Density accuracy approx. 0.002 g/cm³
- Cost effective
- Sources between detectors
- Outputs: Density values of each detector and level of each layer
- Precise information also between detectors
- Reproducibility of the measured level values with accuracy of ± 25 mm
- Configuration and visualization via transmitter unit
Optimal measuring arrangement
- Non-contact measurement - Detectors and electronics have no contact with the interior of the vessel
- Representative measurement due to high-energy gamma sources and a long measurement path
- Depending on requirements, two different arrangements (aligned or staggered) are available
Reliability and safety
- Use under extreme process conditions possible
- Redundant readings - density and level
- Dose minimisation - Use of low activities and safe handling of sources by using flange shields
- Insensitive to wall buildups
SIL certified option
The SENSseries LB 480 detectors are certified for use in SIL2 applications. Even SIL3 is achieved with redundant installation of two LB 480 measuring systems. Berthold is the first manufacturer of SIL certified, radiometric level (min./max. alarm), level and density measurement systems. Thus safe operation of critical processes is guaranteed.
High sensitive scintillation detectors
Due to their robustness (316 L housing material and SIL 2/3 certification), the highly sensitive LB 480 detectors are the ideal density meters for this measurement setup. The number of detectors used depends on the measuring range for example and the desired resolution. For the correct positioning of the detectors on the vessel outer wall, an extremely robust, tailor-made mounting structure is used. Due to this arrangement, the detectors and the electronics are easily accessible for assembly and are also unaffected by the process temperatures in the vessel itself. The local density values of the individual detectors can be transferred to the customer control system via a 4 ... 20 mA HART signal.
A dip tube is inserted inside the vessel to position the sources and avoid contact with the product. In order to ensure an almost identical distance between the dip tube or the source and the container inner wall over the entire measuring range, the geometry of the dip tube depends on the vessel orientation: For vertical vessels, a straight arrangement is used and for horizontally positioned vessels, a curved tube is used. Each dip tube is custom designed and is available in different materials.
The radiation sources are encapsulated gamma sources (Cs-137), which are installed in flexible rods. The number of sources or flexible rods is determined by the measuring range or the desired measuring arrangement.
Our sources are individually designed by our project engineers for each application.
The safe handling of radiation sources is a matter of course for Berthold, which is why a flange shield is mounted for the stowage of the flexible rods including the sources. The height is kept as low as possible, but this does not reduce the shielding effect. This shield not only provides the best shielding effect during transport, but it also allows for the sources to be removed during maintenance work from the dip tube and safely stowed, so that from the point of view of radiation protection safe entry to the vessel can be guaranteed.
For more information about Berthold shields, please follow the link below.
Transmitter LB 478
If besides the density values, the level of the individual layers is also required, the LB 478 transmitter is connected and the staggered arrangement is the first choice. Using mathematical algorithms, this unit determines the exact position of the individual layers and forwards the individual level values as 4..20 mA HART signals to the customer control system. Therefore for this arrangement, a redundant signal transmission (density values from the detector and level values from the transmitter) is ensured. The control cabinet with the integrated transmitters additionally serves the optical representation of the individual measured values as well as various graphics.
Multiphase level measurement - Improving level control in desalters to aid in use of opportunity crudes
This paper shows how Berthold with its highly sophisticated radiometric multiphase level measurement system EmulsionSENS helps refiners to optimize the separation process, minimize the probability of failure, increase efficiency, save chemicals and thus permanently reduce your operating costs.