Equations Used In User-Defined Calculations; Measurement Units Used In User-Defined Calculations - Emerson Micro Motion SGM Series Configuration And Use Manual

Measurement support
13.7.1

Equations used in user-defined calculations

Each user-defined calculation has an equation and a set of user-programmable constants
and/or user-specified process variables.
Equation 13-1:
A, B, X, Y
a, b, c, d, e, f
y
Equation 13-2:
e
A, B, C
t
y
13.7.2

Measurement units used in user-defined calculations

The meter's internal measurement units are used for all process variables referenced by a
user-defined calculation. All constants must be entered in the internal measurement units
or derived using the internal measurement units.
Table 13-1:
Process variable
Density
Referred Density
Relative Density
Molecular Weight
Calorific Value
Mass Flow (external or calculated)
Volume Flow (external or calculated)
Energy Flow
Line Temperature
External Temperature
142
User-defined calculation 1 (square root)
�=A + B ×
User-programmable constants
User-programmable constants or user-specified process variables
Result of calculation
User-defined calculation 2 (exponential)
� = e
Natural logarithm
User-programmable constants
User-programmable constant or user-specified process variable
Result of calculation
Process variables and internal measurement units
� × � + X × �
� × � + Y × �
2
A+ B×t + C × t
Internal measurement unit
g/cm³
g/cm³
g/cm³
g/mol
MJ/kg
kg/sec
l/sec
MJ/sec
°C
°C
®
Micro Motion Gas Specific Gravity Meters (SGM)