a) From the display, go to Menu > Configuration > Inputs/Outputs > Channel A > HART Settings >
Poll External Device.
b) Select Polled Variable 1 or Polled Variable 2.
c) For Variable, select Calorific Value.
d) Change Polling Control to Poll as Primary or Poll as Secondary.
e) Change External Device Tag to match the HART tag of the polled device.
5. To set up mA Input:
a) From the display, go to Menu > Configuration > Inputs/Outputs > Channel D.
b) Set I/O Type to Milliamp Input.
c) Set Power to either internal or external.
d) Go to I/O settings - Set Assignment to Calorific Value, and set the lower and upper range
values.
6. Set up energy flow on an mAO or FO.
Option Description
mAO Configure an mA Output
Select Energy Flow as a source.
FO Configure a Frequency Output
Select Energy Flow as a source.
14.10 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.
14.10.1 Configure PWL
Display
Not available
ProLink III Device Tools > Configuration > Process Measurement > Piecewise Linearization for Gas (PWL)
Configuration and Use Manual Measurement support
MMI-20025166 March 2019
Configuration and Use Manual 225
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