Dynamic SFC332L, Operator'S Manual

Page: 20 / 148

Dynamic Flow Computers SFC332L Manual Quick Start
— 1-15
Date: 8/1/2019
Ranging the Transmitter Inputs:
1. Enter the range values : after assigning the inputs scroll down the transducer inputs
assignment menu to scale the 4-20mA. Enter the value at
@4mA
and
@20mA
. Enter both
values similar to the way the transmitter is ranged. 1-5 volts is equivalent to 4-20mA. Enter
the 1 volt value at the 4mA, and 5 volt value at 20mA. When the Multi Variable is used the 4-
20 ma scale has no effect on anything and does not need to be configured for that input. The
reason is simply that the flow computer gets the data via digital communication from the
transmitter in engineering units, and therefore a scale is not needed. Normal pressure range is
0-3626, temperature –40 to 1200, DP –250 to 250, or -830 to 830 inches of water.
2. Enter the high and low limits : high limits and low limits are simply the alarm points in
which you would like the flow computer to flag as an alarm condition. Enter these values
with respect to the upper and lower range conditions. Try to avoid creating alarm log when
conditions are normal. For example: If the line condition for the pressure is between 0 to 500
PSIG, then you should program less than zero for low pressure alarm, and 500 or more for
high pressure alarm. High limits are also used in the
SCALE
for the Modbus variables. The
high limit is equalent to 32767 or 4095. The low limit is not used for calculating the scale.
The scale starts at zero to wherever the high limit value.
3. Set up the fail code:
Maintenance
and
Failure Code
values tell the flow computer
to use a default value in the event the transmitter fails. The default value is stored in
Maintenance
. There are three outcomes: the transmitter value is always used, no matter
what (
Failure Code
= 0); the
Maintenance
value is always used, no matter what
(
Failure Code
= 1); and the
Maintenance
value is used only when the transmitter’s
value indicates that the transmitter has temporarily failed (
Failure Code
= 2).
RTD inputs will skip 4-20 mA assignment because RTD is a raw signal of 50

(ohms) to 156

. Readings
beyond that range require a 4-20 mA signal to the flow computer or using the built in Rosemount Multi
Variable transmitter. The Rosemount Multivariable has a range of –40-1200 degrees Fahrenheit.
Density coefficients for raw frequency inputs are programmed in this menu. The menu will only show
parameters relevant to the live density selected (i.e., Solartron or UGC, etc.).