Emerson Micro Motion 4200 Configuration And Use Manual page 140

Measurement support
April 2019
NewMeterFactor = ConfiguredMeterFactor ×
2. Ensure that the calculated meter factor does not fall outside 0.98 and 1.02. If the meter factor is
outside these limits, contact customer service.
3. Configure the meter factor in the transmitter.
Calculating the meter factor for mass flow
The flowmeter is installed and validated for the first time. The mass flow measurement from the transmitter is
250.27 lb. The mass flow measurement from the reference device is 250 lb. The mass flow meter factor is
calculated as follows:
The first meter factor for mass flow is 0.9989.
One year later, the flowmeter is validated again. The mass flow measurement from the transmitter is
250.07 lb. The mass flow measurement from the reference device is 250.25 lb. The new mass flow meter
factor is calculated as follows:
The new meter factor for mass flow is 0.9996.
12.5.1 Alternate method for calculating the meter factor for
volume flow
The alternate method for calculating the meter factor for volume flow is used to avoid the difficulties that
may be associated with the standard method.
This alternate method is based on the fact that volume is inversely proportional to density. It provides partial
correction of the volume flow measurement by adjusting for the portion of the total offset that is caused by
the density measurement offset. Use this method only when a volume flow reference is not available, but a
density reference is available.
Procedure
1. Calculate the meter factor for density, using the standard method (see
2. Calculate the meter factor for volume flow from the meter factor for density:
The following equation is mathematically equivalent to the first equation. You may use whichever
MeterFactor
version you prefer.
3. Ensure that the calculated meter factor does not fall outside 0.98 and 1.02. If the meter factor is
outside these limits, contact customer service.
4. Configure the meter factor for volume flow in the transmitter.
140
MeterFlow = 1 x
MassFlow
MeterFlow = 0.9989 x
MassFlow
MeterFactor
Volume =
ConfiguredMeterFactor
Volume =
Configuration and Use Manual
ReferenceMeasurement
FlowmeterMeasurement
250
= 0.9989
250.27
250.25
= 0.9996
250.07
Validate the
1
MeterFactor Density
Density Flowmeter
Density ×
Density ReferenceDevice
Micro Motion 4200 Transmitters
MMI-20048166
meter).