Dynamic SFC332L, Operator'S Manual

Page: 53 / 148

Dynamic Flow Computers SFC332L Manual Data Entry
— 2-8
Date: 8/1/2019
A G A 3 ( O L D A G A 3 )
To set AGA3 flow parameters, set
Flow Equation Type = 0 , and click “eq. settings” button
.
You will then access a submenu in which you can set the parameters below.
Pipe I.D. Inches
Pipe ID in inches is the measured inside pipe diameter to 5 decimals at reference conditions.
Orifice ID Inches
Orifice ID in inches is the measured diameter of the orifice at reference conditions.
DP Cut off
The Flow Computer suspends all calculations whenever the DP, in inches of water column, is less than this
value. This function is vital for suppressing extraneous data when the DP transmitter drifts around the zero
mark under no-flow conditions.
Y Factor (0=None,1=Upstream,2=Downstream)
Y factor is the expansion factor through the orifice. The user must enter the position of the pressure and
temperature sensors. Select y=1 if the sensors are installed upstream of the orifice plate. Select y=2 if the
sensors are down stream of the orifice plate.
Select 0=Flange Tap, 1=Pipe Tap
Tap position is where the differential transmitter is fitted. Select 0 = flange fitted or 1 = pipe fitted.
Isentropic Exponent (Specific Heat)
Ratio of specific heat is a constant associated with each product. Even though it varies slightly with
temperature and pressure, in most cases it is assumed to be a constant.
Viscosity in Centipoise
Even though viscosity will shift with temperature and pressure changes, the effect on the calculations is
negligent. Therefore using a single value is appropriate in most cases. Enter viscosity in centipoise.
Reference Temperature of Orifice
Reference temperature of orifice is the temperature at which the orifice bore internal diameter was
measured. Commonly 68 °F is used.
Orifice Thermal Expansion Coefficient E-6
Orifice thermal expansion is the linear expansion coefficient of orifice material.
Type 304 and 316 Stainless 9.25 E 6
Monel 7.95 E 6
Carbon Steel 6.20 E 6