Liquid Controls SP4000 - Manual (Page 56)

53
SP4000 Flow Computer
FLUID DATA
2
RATE 1
TOTAL
2
RATE 1
TOTAL
6.7
FLUID DATA
(Continued)
Enter a Z-factor for the gas at operating conditions.
The Z-factor indicates how different a "real" gas behaves from an
"ideal gas" which exactly obeys the "general gas law" (P x V/T =
constant; Z=1). The further the real gas is from its condensation point,
the closer the Z-factor approaches "1".
Note:
• The Z-factor is used for all gas equations.
• Enter the Z-factor for the average process conditions
(pressure and temperature).
Input:
Number with fixed decimal point: 0.1000...10.0000
Display: 1.000
FLOW. Z-FACTOR
Enter a Z-factor for the gas at reference conditions.
Note:
• The Z-factor is used for all gas equations.
• Define the standard conditions in the submenu "STP
REFERENCE" (OTHER INPUT submenu group).
Input:
Number with fixed decimal point: 0.1000...10.0000
Display: 1.000
REF. Z-FACTOR
Enter the isentropic exponent of the fluid. The isentropic exponent
describes the behavior of the fluid when measuring the flow with a
square law flowmeter.
The isentropic exponent is a fluid property dependent on operating
conditions.
Note:
Select one of the "SQR LAW" selections in "FLOWMETER
TYPE" of submenu group "FLOW INPUT" to activate this
function.
Input:
Number with fixed decimal point: 0.1000...10.0000
Display: 1.4000
ISENTROPIC EXP.
FLOW. Z-FACTOR
REF. Z-FACTOR
ISENTROPIC EXP.