Endress+Hauser introduces Liquiphant M Density Meter
Because the Liquiphant M provides on-line measurements, it allows control systems to react much faster to changing process conditions. Instead of waiting for results to come back from the lab, a control system can take corrective action immediately by performing closed-loop control.
The Liquiphant employs a mechanically oscillating fork with two tines that are each excited to resonant frequency. The frequency changes when the fork is immersed in any liquid. If the vibration falls below a predetermined frequency, the sensor reports the covered state to a subsequent switching electronics. The tines are excited by a piezoelectric drive. The resonant frequency depends on the moment of inertia of the fork as well as the membrane stiffness, and the frequency measures approximately 1000-1200Hz in air.
Changes in resonant frequency are directly interrelated with the density of the medium. In a lower medium density, such as liquefied gas, the resulting resonant frequency is higher than in more pronounced densities like water. The electronics of the Liquiphant can measure this change in the resonant frequency. The density of the medium can also be calculated taking temperature and process pressure into consideration.
Concentration can be calculated in mass or volume units. For example, "Degree Brix" is a measuring unit for the specific density of liquids. This is particularly used in the food industry to determine the sugar content in fruit juices and beverages, or in oil production to measure the salt concentration in tanks.
Customers can customize the Liquiphant M for many density and concentration applications including but not limited to:
The Liquiphant M Density meter is capable of providing analytical process information on-line and in-line according to customer requirements. It offers solutions for a variety of applications including process optimization, quality monitoring and reduction of waste. The meter can also be used for monitoring of preliminary, interim and final products during blending operations - and for verification and documentation of process steps. Because it reduces the need for offline laboratory measurements, it also improves plant availability and speeds response to changing conditions.
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