3.8.4 Definitions of Flow Parameters.
K factor:
Pulse per unit volume divider. For example if 100 pulses
are input for 1 unit volume (i.e. cu.ft. or gal) a K factor of 100 will be
used.
Number of Pulses
K Factor
Z factor:
Compressibility factor of a gas.
Specific gravity:
Constant for the material being measured calcu-
lated at Standard or the Base Reference Temperature.
K1 factor:
Compensation factor used in making Orifice/Pitot calcu-
lations. Refer to K1 Factor calculations (See Chapter 6).
Lo flow/Delta P lo:
Flow value or differential pressure value for
Linear or Orifice/Pitot measurement respectively at which the analog
value input is lowest.
Hi flow/Delta P hi:
Flow value or differential pressure value for
Linear or Orifice/Pitot measurement respectively at which the analog
value input is highest.
Lo flow Cutoff:
Lowest uncompensated flow value below which
any calculations are unnecessary. For Example:
i) A small leakage when valve is closed, to be ignored.
ii) Inaccuracy at lowest end of square law measurements.
C factor (x 10
-6
):
Thermal coefficient of expansion for liquid being
measured. Related to liquids flow equation and target liquid charac-
teristics. (see Chapter 6)
Mean Spec Heat:
Constant value for the ability of a fluid to retain
heat. A high value for good heat retention.
Cutoff: 0 to 40000 Hz:
Highest pulse rate which the unit will
accept pulses. Higher pulse rates are ignored. This is accomplished
by hardware and software filters.
Lo/Hi alarm:
Compensated Flow values at which the unit acti-
vates relay output.
3-20
Display Value =
