Alternate Method For Calculating The Meter Factor For Volume Flow - Emerson Micro Motion 5700 Configuration And Use Manual

Measurement support
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.
12.4.1 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.
2.
3.
4.
178
MeterFactor
MeterFactor
MassFlow
Calculate the meter factor for density, using the standard method (see
Validate the meter).
Calculate the meter factor for volume flow from the meter factor for density:
MeterFactor
Note
The following equation is mathematically equivalent to the first equation. You may use
whichever version you prefer.
MeterFactor = ConfiguredMeterFactor
Volume
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.
Configure the meter factor for volume flow in the transmitter.
250
= 1
MassFlow
250.27
250.25
= 0.9989
250.07
=
Volume
MeterFactor
Density
Micro Motion Model 5700 with Ethernet Transmitters
= 0.9989
= 0.9996
1
Density
Density
Flowmeter
Density
Reference Device