New multivariable transmitter simplifies DP flow measurement

The Rosemount 3051S multi-variable transmitter from Emerson Process Management improves productivity and energy management while enhancing environmental compliance.
By Peter Welander November 6, 2009

The 3051SMV includes an integrated RTD temperature prove

Emerson Process Management has introduced the Rosemount 3051SMV multi-variable transmitter designed to provide three variables to simplify differential pressure (DP) flow measurement applications, particularly where steam and natural gas are involved. The company says this new approach reduces the number of devices traditionally required to make DP flow measurement from ten to one.

The Rosemount 3051SMV promises to simplify mass and energy flow measurement, increase accuracy, and provide faster updates through patented advanced compensation techniques. The user enters three application parameters and the engineering assistant software handles the rest. Using data from its integrated RTD temperature probe and sophisticated analysis capabilities embedded in its transmitter, the 3051SMV provides full compensation of over 25 different parameters to achieve a five-fold improvement in flow performance compared to uncompensated differential pressure flow.

Internal capabilities include Joule-Thomson correction and sensor matching with Callendar-Van Dusen constants. The unit updates flow measurement 22 times per second so users can track production, demand, and total usage for process gas, saturated steam, superheated steam, and natural gas. The results can be more accurate billing, immediate detection of anomalies that lead to losses, and optimization of product throughput and quality during peaks in demand.

The device allows users to specify the level of compensation that best matches the application and can be scaled to optimize flow measurement in four different applications:

• Full compensation (differential pressure, line pressure, and temperature measurement) for gas, natural gas or steam;
• Differential and line pressure measurement for saturated steam;
• Differential pressure and temperature measurement for liquids or saturated steam; and
• Differential pressure measurement for liquids at stable temperatures.

This pressure sensor has been designed to integrate easily with differential pressure flow measuring devices in ways that minimize pipe penetrations and reduce blockage potential. Reducing potential leak points and preventing fugitive emissions results in better protection of the environment.


-Edited by Peter Welander, process industries editor,,
Control Engineering Process Instrumentation & Sensors Monthly
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