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A multivariable transmitter is a differential pressure transmitter that is capable of measuring a number of independent process variables, including differential pressure, static pressure, and temperature. When used as a mass flow transmitter, these independent values can be used to compensate for changes in density, viscosity and other flow parameters. A typical multivariable transmitter installation and setup for flow measurement is shown below:

Multivariable Transmitter Installation & SetUp |

A Multivariable transmitter delivers unprecedented performance and capabilities by providing three separate

measurements in one simple, easy-to-use solution, so you can realize a significant reduction in installed cost.

When used in DP flow measurement applications, it measures process pressure, temperature and differential pressure simultaneously and dynamically calculates 'real time', fully-compensated mass flow. Fully compensated mass flow reduces sources of traditional DP flow uncertainty caused by pressure and temperature variations. A multivariable transmitter used in DP flow measurement greatly increases accuracy to as high as ±0.8% and increases DP flow rangeability from 3:1 to 14:1.

(1) Compensate flow readings for changes in line pressure and process temperature

(2) Maximize insight into process conditions with flow calculations that update

many times a second

(3) Reduce pipe penetrations and save on impulse piping and connection systems

with three measurements in a single device

(4) ±0.8% flow accuracy over 14:1 flow turndown

(5) Capable of measuring variables such as: Mass, Volumetric and Energy Flow, Totalized Flow, Differential Pressure, Static Pressure (Gage and Absolute),

Process Temperature.

(6) Can produce a 4-20 mA HART output

(1) Gas and natural gas measurement

(2) Saturated and superheated steam measurement

(3) Liquid measurement

measurements in one simple, easy-to-use solution, so you can realize a significant reduction in installed cost.

When used in DP flow measurement applications, it measures process pressure, temperature and differential pressure simultaneously and dynamically calculates 'real time', fully-compensated mass flow. Fully compensated mass flow reduces sources of traditional DP flow uncertainty caused by pressure and temperature variations. A multivariable transmitter used in DP flow measurement greatly increases accuracy to as high as ±0.8% and increases DP flow rangeability from 3:1 to 14:1.

**Key Advantages of Multivariable Transmitters in Flow Measurement Applications**(1) Compensate flow readings for changes in line pressure and process temperature

(2) Maximize insight into process conditions with flow calculations that update

many times a second

(3) Reduce pipe penetrations and save on impulse piping and connection systems

with three measurements in a single device

(4) ±0.8% flow accuracy over 14:1 flow turndown

(5) Capable of measuring variables such as: Mass, Volumetric and Energy Flow, Totalized Flow, Differential Pressure, Static Pressure (Gage and Absolute),

Process Temperature.

(6) Can produce a 4-20 mA HART output

Key Application AreasKey Application Areas

(1) Gas and natural gas measurement

(2) Saturated and superheated steam measurement

(3) Liquid measurement