NuFlo MC-II Plus Panel Mount, User Manual, Page: 25 / 92

MC-II Plus WP-PM Flow Analyzer
May 2005 19
spare parts list. The divisor, divisor decimal point, rate multiplier, and rate multiplier
decimal point must be determined, then entered directly into the MC-II
Plus Flow
Analyzer. The divisor is calculated as follows:
( ) ( )
2
Fpv Ts Pa Pg
CON Tf Ps FC
Divisor
× × +
× × ×
=
Where:
FC = Meter factor in pulses per actual cubic foot (PACF)
Ps = Standard pressure in PSIA
Tf = Average flowing temperature in degrees Rankine (
°
R)
CON = Conversion factor for number of standard cubic feet (SCF) per unit volume of
desired measure.
Pg
= Average flowing pressure in PSIG
Pa = Atmospheric pressure in PSIA
Ts = Standard temperature in degrees Rankine (
°
R)
Fpv = Average Supercompressibility Factor (enter a factor of 1 if supercompressibility
factor is not known)
The formula for calculating the rate multiplier is:
Divisor
TC
lier RateMultip
=
TC = Time Constant (seconds per unit time)
Normally used time constants are:
Units/minute rate,
TC
=
60
Units/hour rate,
TC
=
3600
Units/day rate, TC = 86400
An outline of the user prompts and the steps followed for this type of calibration are
below:
1. Press the ACCESS key to enter the Calibrate Mode.
2. At the prompt tot Eng , press INCR to select USEr . Press ENTER .
3. At the prompt tot d.P , press INCR to change the decimal point position for the
volume. Press ENTER .