An educational blog sponsored by Classic Controls focusing on education and training for the process control, instrumentation, and industrial valve community.
The VEGAMulti-Point Density Array (MDA) solution for fixed-point interface profiling measurements. It provides high resolution and an unparalleled method of measuring interfaces, especially those with emulsion layers and operates reliably in the most difficult of applications.
Why Use the MDA?
The MDA system provides continuous density data at each individual measurement point, specific to each horizontal plane of elevation. As the outputs change from the multiple detectors, the operator can determine the movement of the interface or the size of the emulsion layer for optimal running efficiency of the unit. The density profile created by the MDA system provides actionable data that allows for real-time process monitoring, leading to unit efficiency that is unachievable by other measurement technologies.
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Level switches utilizing the conductivity principle are applicable
to liquids with sufficient conductivity to complete an electrical circuit. For detecting liquid level,
probes of specific lengths are immersed into the subject tank, vessel, or pipeline. These
probes, and in some cases a conductive tank wall, serve as contacts of an
electric circuit. Multiple probes of differing lengths can
be extended into a tank or pipeline and are monitored by a single controller. Each probe length
extends to the level to be detected. As the vessel fills or empties, electrical
conductivity between the tank wall (or the reference probe) and the level
measurement probes will change due to the liquid media reducing or
increasing the resistance of a conductive path between the monitored points.
The established connections will be detected by the controller, which activates
a relay providing an output signal.
Conductive level switches provide a simple, robust, and maintenance free solution to many level measurement challenges. Complete level measurement systems are available in numerous configurations to accommodate a wide range of application and installation details. Immersion probes are available in several materials to provide compatibility with appropriate liquid media. Share your level measurement and control
challenges withprocess measurement specialistsand get their input for the best solution
for your application.
DPharp Pressure Transmitter
(courtesy of Yokogawa)
The Yokogawa DPharp digital sensor uses two single crystal silicon resonators vibrating at their natural frequencies. When pressure is applied, one of the resonators goes into tension, while the other goes into compression mode. The CPU directly counts the sensor output frequencies without any additional A/D conversion. Due to the excellent elastic properties of silicon material, the DPharp sensor exhibits greater linearity and repeatability, with no inherent hysteresis. The resonant sensors also provides a large output signal resulting in greater sensitivity and higher turndown.
Long term, accurate and stable measurement in real world conditions is fundamental to realize reliable and efficient plant operation. Transmitters in the field are subjected to continuous variations of ambient and process temperature, static and overpressure conditions affecting their accuracy. The long term stability of the transmitter is a measure of performance drift and dependent on the sensor technology. Total accuracy and long term stability determine the recalibration interval for the devices according to the acceptable performance levels.
Additionally,the DPharp digital sensor has the unique ability to simultaneously measure static pressure and differential pressure. The multi-sensing platform enables real-time dynamic compensation for unmatched precision and forms the basis for implementation of advanced diagnostics. The information is available through various digital communication protocols, providing additional knowledge about your process. The multi-sensing functionality, with guaranteed accuracy of static pressure signal, allows the process to operate with fewer devices and delivering reduced lifecycle costs.
For more information on the Yokogawa DPharp, contact:
