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:
MeterFactor
MassFlow
= 0.9989
250.25
250.07
= 0.9996
The new meter factor for mass flow is 0.9996.
9.3.1
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:
MeterFactor
Volume
=
1
MeterFactor
Density
Note
The following equation is mathematically equivalent to the first equation. You may use
whichever version you prefer.
MeterFactor
Volume
= ConfiguredMeterFactor
Density
Density
Flowmeter
Density
Reference Device
3.
Ensure that the calculated meter factor is between 0.8 and 1.2, inclusive. If the
meter factor is outside these limits, contact Micro Motion customer service.
4.
Configure the meter factor for volume flow in the transmitter.
9.4
Perform a (standard) D1 and D2 density
calibration
Density calibration establishes the relationship between the density of the calibration
fluids and the signal produced at the sensor. Density calibration includes the calibration of
the D1 (low-density) and D2 (high-density) calibration points.
Measurement support
Configuration and Use Manual
65
Summary of Contents for Micro Motion LNG Series
Page 1: ...Configuration and Use Manual MMI 20032809 Rev AA February 2017 Micro Motion LNG Series Meters ...
Page 6: ...Contents iv Micro Motion LNG Series Meters ...
Page 8: ...Getting Started 2 Micro Motion LNG Series Meters ...
Page 12: ...Before you begin 6 Micro Motion LNG Series Meters ...
Page 18: ...Quick start 12 Micro Motion LNG Series Meters ...
Page 20: ...Configuration and commissioning 14 Micro Motion LNG Series Meters ...
Page 50: ...Configure device options and preferences 44 Micro Motion LNG Series Meters ...
Page 56: ...Integrate the meter with the control system 50 Micro Motion LNG Series Meters ...
Page 58: ...Complete the configuration 52 Micro Motion LNG Series Meters ...
Page 60: ...Operations maintenance and troubleshooting 54 Micro Motion LNG Series Meters ...
Page 74: ...Measurement support 68 Micro Motion LNG Series Meters ...
Page 94: ...Using ProLink III with the transmitter 88 Micro Motion LNG Series Meters ...
Page 98: ...Default values and ranges 92 Micro Motion LNG Series Meters ...
Page 99: ...Default values and ranges Configuration and Use Manual 93 ...