Emerson Rosemount 3100 Series, Reference Manual, Page: 49 / 144

Reference Manual
00809-0100-4840, Rev. BA
July 2008
4-19
Rosemount 3100 Series
Power Factor for the
Flow Law
(The 3102/3105)
Screen display:
P.FACt
Factory default value:
1.000
This menu is offered if the selected duty is Flow and a profile (e.g. “
SPEC.C
”)
requires the manual editing of a power factor in the formula:
Flow Q = kh* (where * = the power factor)
The transmitter is pre-programmed with appropriate power factors for many
standard flow profiles, and will automatically select the appropriate factor
(See Table 4-1 on page 4-18). Alternatively, the power factor may be edited to
suit a specific flow structure.
NOTE:
This menu option is in the programming menu. See Figure C-2 on page C-3
for a map of the menu structure and how to access the menu options.
To change the power factor:
a) If entering the menu system from the PV display, press the green button
↓
repeatedly until the “
P.FACt
” menu option is indicated (see note above.)
b) Press the blue button
→
to enter the “
P.FACt
” menu and display the
present power factor.
c) If the power factor is correct, press the red button
↵
to exit to the menu.
(The menu option “
P.FACt
” re-appears. To get to the next menu, press
↓.)
d) Press the blue button
→
to start the editing mode. The first digit flashes to
indicate it can now be edited.
e) Press the green button
↓
repeatedly to edit the flashing digit.
f) Press the blue button
→
to move to the next digit. The digit flashes to
indicate it can be edited.
g) Repeat steps (e) and (f) until the last digit is flashing, and edited as
required.
h) Press the blue button
→
to confirm the new value. (The flashing stops.)
i) If the new value is correct, press the red button
↵
to save. The display
changes to the next menu option.
j) If the new value is incorrect, press the blue button
→
to exit to the menu.
The “
P.FACt
” re-appears; re-start at step (b) or press
↓
for next menu.
K-factor for the
Flow Law
(The 3102/3105)
Screen display
SCALE
Factory default value
1.000
NOTE:
If a flow duty has been selected, the value entered into this parameter is in
effect the K-factor in a flow law of the form Flow Q = kh*.
If a Distance, Level or Contents (Volume) duty has been selected, the value
entered into this parameter is a factor used to scale the measured distance,
level, or volume.
For a Level or Distance duty, the scaling factor is normally left at the value
calculated by the transmitter (depending upon previously entered data and
duty selected), or the default value of 1.000.