Revision 1.0
SMV800 Modbus User's Guide
Page 59
2.3.8. Using Custom Units for Flow Measurement
The Modbus host contains a selection of preprogrammed engineering units that you can choose to
represent your flow measurement. If you want the flow measurement to represent an engineering unit,
you must select custom units and enter a tag that identifies the desired custom unit.
Using the Modbus config tool, selecting Custom Units allows you to choose a unit that is compatible
with your application process. Additionally, a conversion factor must be calculated and entered when
configuring the flow variable. This conversion factor is a value used to convert the standard units used
by the SMV into the desired custom units. The standard units used by the SMV are:
•
Tonnes/hour – for mass flow
•
Meters
3
/hour – for volumetric flow
For example, to calculate the conversion factor for a volumetric flow rate of Standard Cubic Feet per
Day – SCFD
Conversion Factor = 847.552
For example, to calculate the conversion factor for a mass flow rate of Kilograms per day – kg/day
Conversion Factor = 24000
This factor is then entered as the Conversion Factor value in Flow Compensation Wizard of the Modbus
config tool during configuration. Please note that when using the standard equation, the conversion
factor, as well as other values, are used to calculate the Wizard Kuser factor. When using the dynamic
corrections equation, the conversion factor is used as the Kuser factor.
Refer to the SCT on-line manual for additional information about using custom units
Summary of Contents for SMV800
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