
100/180 mm PAPERLESS GRAPHIC RECORDER: USER GUIDE
User Guide
Page 115
HA028910
Issue 13 Sep 16
4.3.11 FUNCTION (Cont.)
LINEAR MASS FLOW (Cont.)
Commpressibility factor ( Z-Factor)
Compressibility factor is a density-related measure of how far a particular gas devi-
ates from a ‘perfect’ gas under any set of temperature and pressure conditions, and
is given by the equation:
where: Z = Compressibility factor
P = Absolute pressure of the gas in kPa(A)
T = Absolute temperature of the gas (Kelvins)
%
= gas density at pressure P and temperature T (from published tables)
CONFIGURABLE PARAMETERS
Figure 4.3.11d shows the relevant part of the confi guration menu for a maths channel with ‘Linear Mass
Flow’ function selected.
Z
!
P
T
$
1
%
Figure 4.3.11d Linear mass fl ow menu
Flow
Allows the input channel measuring the fl owmeter output to be entered
Temperature
Allows the input channel measuring the fl uid temperature (Kelvins) to be entered
Absolute Pressure Allows the input channel measuring the absolute gas pressure (kPa(A)) to be entered
Scale o/p
Full scale output from the fl owmeter in fl owmeter units (S)
Ma
Full scale input range set for ‘Flow’ channel in fl owmeter units (ma
max
)
Gas Constant
the relevant gas constant in J/kg-K
Z
The compressibility factor described above.
Function
Linear Mass Flow
Flow
Temperature
Absolute Pressure
Scale o/p
0
Ma
0
Gas Constant
0
Z
Units
Channel 1
0
Units
Maths Number
1) Math 1
Value
123.4567
Channel 2
Channel 3
Units
Apply Discard
J/kg-K