Validate The Meter - Emerson Micro Motion 4200 Configuration And Use Manual

Configuration and Use Manual
MMI-20048166

12.5 Validate the meter

Display Menu > Configuration > Process Measurement > Flow Variables > Mass Flow Settings > Meter Factor
Menu > Configuration > Process Measurement > Flow Variables > Volume Flow Settings > Meter Factor
Menu > Configuration > Process Measurement > Density > Meter Factor
ProLink III Device Tools > Configuration > Process Measurement > Flow > Mass Flow Rate Meter Factor
Device Tools > Configuration > Process Measurement > Flow > Volume Flow Rate Meter Factor
Device Tools > Configuration > Process Measurement > Density > Density Meter Factor
Field Communicator Configure > Manual Setup > Measurements > Flow > Mass Factor
Configure > Manual Setup > Measurements > Flow > Volume Factor
Configure > Manual Setup > Measurements > Density > Density Factor
Meter validation compares flowmeter measurements reported by the transmitter to an external
measurement standard. If the transmitter value for mass flow, volume flow, or density measurement is
significantly different from the external measurement standard, you may want to adjust the corresponding
meter factor. The flowmeter's actual measurement is multiplied by the meter factor, and the resulting value
is reported and used in further processing.
Prerequisites
Identify the meter factor(s) that you will calculate and set. You may set any combination of the three meter
factors: mass flow, volume flow, and density. Note that all three meter factors are independent:
• The meter factor for mass flow affects only the value reported for mass flow.
• The meter factor for density affects only the value reported for density.
• The meter factor for volume flow affects only the value reported for volume flow or gas standard volume
flow.
Important
To adjust volume flow, you must set the meter factor for volume flow. Setting a meter factor for mass flow
and a meter factor for density will not produce the desired result. The volume flow calculations are based on
original mass flow and density values, before the corresponding meter factors have been applied.
If you plan to calculate the meter factor for volume flow, be aware that validating volume in the field may be
expensive, and the procedure may be hazardous for some process fluids. Therefore, because volume is
inversely proportional to density, an alternative to direct measurement is to calculate the meter factor for
volume flow from the meter factor for density. See
volume flow for instructions on this method.
Obtain a reference device (external measurement device) for the appropriate process variable.
Important
For good results, the reference device must be highly accurate.
Procedure
1. Determine the meter factor as follows:
a) Use the flowmeter to take a sample measurement.
b) Measure the same sample using the reference device.
c) Calculate the meter factor using the following formula:
Configuration and Use Manual
Alternate method for calculating the meter factor for
Measurement support
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