West Control Solutions MRC 9000 User Manual
Page 110
Section 4
Edition 3
Rev G
4-28
4.
POLYNOMIAL
INPUT 1:
X
PROMPT:
DVxx INPUT X
INPUT 2:
A
PROMPT:
DVxx INPUT A
INPUT 3:
B
PROMPT:
DVxx INPUT B
INPUT 4:
C
PROMPT:
DVxx INPUT C
INPUT 5:
D
PROMPT:
DVxx INPUT D
ACTUATOR:
n/a
RESET:
n/a
OUTPUT:
= A*X**3 + B*X**2 + C*X + D
5.
LINEAR MASS FLOW - AGA 3 LINEAER GAS FLOW
INPUT 1:
F
PROMPT:
DVxx RAW FLOW
INPUT 2:
PRES
PROMPT:
DVxx STATIC PRES ABS
INPUT 3:
TEMPF
PROMPT:
DVxx FLOW TEMP
°
F
INPUT 4:
COMP
PROMPT:
DVxx COMP. CORRECT.
INPUT 5:
C
PROMPT:
DVxx SCALING CONST.
ACTUATOR:
n/a
RESET:
n/a
OUTPUT:
=C*F*SQRT (PRES/(TEMPR*COMP))
where: TMPR = TEMPF + 459.67
If INPUT 1 is "NOT USED", then F=1
If INPUT 2 is "NOT USED", then PRES=1
If INPUT 3 is "NOT USED", then TEMPR=1 (not TEMPF)
If INPUT 4 is "NOT USED", then COMP=1
If INPUT 5 is "NOT USED", then C=1
NOTES:
F - Raw Linear Fow Input
PRES - Static Pressure - must be ABSOLUTE
TEMPF - Flow Temperature - must be degrees F
COMP - Compressibility Correction
C - Scaling Constant
This function converts TEMP from degrees F to degrees R in the equation.
6.
DP MASS FLOW - AGA 3 DP GAS FLOW
INPUT 1:
DP
PROMPT:
DVxx DIFFERENT. PRES
INPUT 2:
PRES
PROMPT:
DVxx STATIC PRES ABS
INPUT 3:
TEMPF
PROMPT:
DVxx FLOW TEMP
°
F
INPUT 4:
COMP
PROMPT:
DVxx COMP. CORRECT.
INPUT 5:
C
PROMPT:
DVxx SCALING CONST.
ACTUATOR:
n/a
RESET:
n/a
OUTPUT:
= C*SQRT ((DP*PRES) / (TEMPR*COMP))
where TEMPR = TEMPF + 459.67)
If INPUT 1 is "NOT USED", then DP=1
If INPUT 2 is "NOT USED", then PRES=1
If INPUT 3 is "NOT USED", then TEMPR=1 (not TEMPF)
If INPUT 4 is "NOT USED", then COMP=1
If INPUT 5 is "NOT USED", then C=1