Reference Manual
00809-0100-4801, Rev FA
October 2010
Rosemount 3051S Series
3-22
Field Communicator v3.3
To configure the scaled variable with a Field Communicator, perform the
following procedure:
1. From the HOME screen follow the fast key sequence “Scaled Variable
Configuration.”
2. Select OK after the control loop is set to manual.
3. Enter the scaled variable units.
a. Units can be up to five characters long and include A — Z, 0 — 9, -,
/,%, and *. Default unit is DEFLT.
b. The first character is always an asterisk (*), which identifies the units
displayed are scaled variable units.
4. Select scaled data options
a. Select linear if the relationship between PV and scaled variable units
are linear. Linear prompts for two data points.
b. Select square root if the relationship between PV and scaled
variable is square root (flow applications). Square root will prompt
for one data point.
5. Enter pressure value position 1. Pressure values must be within the
range of the transmitter.
a. (If performing a Linear Function) Enter the lower known value point
considering any linear offset.
b. (If performing a Square Root Function) Select OK to acknowledge
pressure value is set to zero.
6. Enter scaled variable position 1.
a. (If performing a Linear Function) Enter the lower known value
point; this value must be no longer than seven digits.
b. (If performing a Square Root Function) Select OK to acknowledge
scaled variable value is set to zero.
7. Enter pressure value position 2. Pressure values must be within the
range of the transmitter.
a. Enter the upper known value point.
8. Enter scaled variable position 2.
a. (If performing a Linear Function) Enter custom unit equivalent to
the upper known value point; this value must be no longer than
seven digits.
b. (If performing a Square Root Function) Enter custom unit
equivalent to the value in step 7; this value must be no longer than
seven digits. Skip to step 10.
9. Enter linear offset value in scaled variable (custom) units (If performing a
Linear Function). Skip to step 11.
10. Enter Low Flow cutoff mode (If performing a Square Root Function)
a. Select OFF if a low flow cutoff value is not desired.
b. Select ON if a low flow cutoff value is desired and enter this value in
scaled variable (custom) units on the next screen.
11. Select OK to acknowledge that the loop can be returned to automatic
control.
(12 strony)
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