Emerson Rosemount 3100 Series, Reference Manual, Page: 68 / 144

Reference Manual
00809-0100-4840, Rev. BA
July 2008
Rosemount 3100 Series
5-10
Setting the Pulse
Repetition Frequency
(The 3102/3105)
Screen display:
Prf
Factory default value:
1.0
The rate of pulses transmitted is set at a factory default value of
once-per-second.
The transmitter may be set to transmit faster or slower at selectable repetition
rates between 0.5 and 2.0 times per second.
NOTE:
The is also ‘cycle time’ of the transmitter.
The pulse repetition frequency may be changed to overcome cross talk
problems if more than one ultrasonic transmitter is mounted in the same tank.
NOTE:
This menu option is in the engineering menu “
Eng
”. See “Accessing the
Engineering Menu (The 3102/3105)” on page 5-6 or see Figure C-4 on
page C-5 for a map of the menu structure.
To change the pulse repetition frequency:
a) After entering the “
Eng
” menu (see the note above), press the green
button
↓
repeatedly until “
Prf
” is indicated.
b) Press the blue button
→
to enter the pulse frequency menu.
The display indicates the present frequency value
c) If this pulse frequency is correct, press the red button
↵
to exit to the
menu. (The menu “
Prf
” re-appears”. To go to the next menu, press
↓
.)
d) Press the blue button
→
to start the editing mode. The pulse repetition
frequency flashes to indicate it can be edited.
e) Press the green button
↓
repeatedly to scroll through the available options
(0.5 to 2.0).
f) Press the blue button
→
to confirm the new setting. (The flashing stops.)
g) If the new setting is correct, press the red button
↵
to save. The display
changes to the next menu option.
h) If the new setting is incorrect, press the blue button
→
to exit to the menu.
The “
Prf
” re-appears; re-start at step (b) or press
↓
for the next menu.
Setting Valid Echo Count
(The 3102/3105)
Screen display:
Stir
Factory default value:
4
This parameter is normally used in vessels with a stirrer or agitator,
particularly if there is slow movement. The transmitter may detect uncovered
blades and treat them as a valid echo and calculate an incorrect level reading.
NOTE:
This menu option is in the engineering menu “
Eng
”. See “Accessing the
Engineering Menu (The 3102/3105)” on page 5-6 or see Figure C-4 on
page C-5 for a map of the menu structure.