Flow-X─ Function Reference
4-167
Flow-X General functions - fxASTM_D1550_Ctl
fxASTM_D1550_Ctl
Description
This function calculates the Ctl value (VCF) of Butadiene based on the ASTM Designation 1550. The
standard specifies several tables. This function uses table 2, which contains values for the volume
correction factor as a function of the relative density at 60°F and the observed temperature.
Compliance
ASTM Designation: D1550 -94 (Reapproved 2005), Standard ASTM Butadiene Measurement
Table 2 Reduction of Observed Volume to 15.6ᵒC (60ᵒF) Against Specific Gravity 60/60ᵒF
Function inputs
Remark
EU
SW tag
Range
Default
Name
Optional tag name, tag
description and tag group
Relative density at
60°F
-
0..1
0
Observed
temperature
Temperature at which the
relative density is observed
°F
-100..150
20
Function
outputs
Remark
EU
SW
tag
Alarm
Fallback
Status
0: Normal
1: Input argument out of range
2: Calculation error
-
STS
FIOOR
CALCERR
Ctl
Volume correction factor for
temperature. The output value will
NOT be rounded.
-
CTL
1
Calculation out
of range
With respect to the standard the input
values are:
0: In Range
1: Out of Range
-
OOR
0
Calculations
The Standard consists of a set of table values with a resolution of 0.001 for the relative density at 60ᵒF
and 1ᵒF for temperature. The function applies a linear interpolation between table values based on the
unrounded input values. When an input value lies outside the range of the table the function limits the
input value to the minimum or maximum value of the table.
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