Piecewise Linearization (Pwl) For Calibrating Gas Meters; Use The Fuel Consumption Application; Fuel Consumption Application Architecture - Emerson Micro Motion 2700 Configuration And Use Manual

Measurement support
9.4 Piecewise linearization (PWL) for calibrating
gas meters
Piecewise linearization (PWL) can linearize the measurements of flow meters for greater
accuracy in order to measure gas over a wide range of flow rates. PWL does not apply when
measuring liquid flow. When better accuracy is required over the published gas
measurement specifications, an Emerson-approved independent gas laboratory can
calibrate gas up to 10 PWL adjustment points.
PWL configuration and calibration information is not available through HART.
For more information, see the white paper, The Practical Application of Multi-Point Piecewise
Linear Interpolation (PWL) and Other Developing Trends with Coriolis Meters for Natural Gas
Custody Transfer Applications, available at www.emerson.com.
The PWL feature is available in ProLink III, so you can view the points that are stored and
capture them in the uploaded and downloaded configuration files.
9.5

Use the fuel consumption application

For detailed information about fuel consumption, see the Micro Motion
Application for Transmitters Installation and Operation Guide.
Restriction
Fuel consumption process variables are available only over HART with HART 7 enabled (default). Fuel
consumption parameters cannot be configured with HART.
9.5.1

Fuel consumption application architecture

The Fuel consumption application is designed to support fuel efficiency and fuel
management projects and practices by providing accurate real-time fuel consumption
data.
•
•
•
154
Automatically calculates the fluid consumption between two Coriolis flow sensors,
typically for recirculating fuel consumption loops
Eliminates the need to program an external calculation system and minimizes
common inaccuracies related to time lag, sampling issues and cumulative errors
Uses a proprietary algorithm that adapts to the unique calibration of each pair of
Coriolis flow sensors
Micro Motion Model 2700 Transmitters with Intrinsically Safe Outputs
®
Fuel Consumption