Options for Gas Standard Volume Flow Measurement Unit
The transmitter provides a standard set of measurement units for Gas Standard Volume Flow Measurement
Unit, plus one user-defined special measurement unit. Different communications tools may use different
labels for the units.
Define a special measurement unit for gas standard volume flow
Display Menu > Configuration > Process Measurement > Flow Variables > Volume Flow Settings > Units >
SPECIAL
ProLink III Device Tools > Configuration > Process Measurement > Flow > Gas Standard Volume Flow Unit > Special
Field Communicator Configure > Manual Setup > Measurements > Optional Setup > Special Units > Special Gas Standard
Volume Units
A special measurement unit is a user-defined unit of measure that allows you to report process data, totalizer
data, and inventory data in a unit that is not available in the transmitter. A special measurement unit is
calculated from an existing measurement unit using a conversion factor.
Procedure
1. Specify Base Gas Standard Volume Unit.
Base Gas Standard Volume Unit is the existing gas standard volume unit that the special unit will be
based on.
2. Specify Base Time Unit.
Base Time Unit is the existing time unit that the special unit will be based on.
3. Calculate Gas Standard Volume Flow Conversion Factor as follows:
a) x base units = y special units
b) Gas Standard Volume Flow Conversion Factor = x ÷ y
4. Enter the Gas Standard Volume Flow Conversion Factor.
The original gas standard volume flow value is divided by this conversion factor.
5. Set Gas Standard Volume Flow Label to the name you want to use for the gas standard volume flow
unit.
6. Set Gas Standard Volume Total Label to the name you want to use for the gas standard volume total
and gas standard volume inventory unit.
The special measurement unit is stored in the transmitter. You can configure the transmitter to use the
special measurement unit at any time.
Defining a special measurement unit for gas standard volume flow
You want to measure gas standard volume flow in thousands of standard cubic feet per minute.
1. Set Base Gas Standard Volume Unit to SCFM.
2. Set Base Time Unit to minutes (min).
3. Calculate the conversion factor:
a. One thousands of standard cubic feet per minute = 1000 cubic feet per minute
Configure process measurement Configuration and Use Manual
April 2019 MMI-20048166
34 Micro Motion 4200 Transmitters
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