72
Reference Manual
00809-0200-4840, Rev BA
December 2014
Section 4: Configuration
4.3.32
Target frequency (P045)
This sets the frequency used for transmitting an ultrasonic pulse. The optimum frequency
depends on the characteristics of the transmitter’s piezoelectric crystals, which are affected by
temperature.
The transmitter has a look-up table to select a frequency value to give the highest echo strength
from the prevailing conditions at the site. This look-up function operates when Target
Frequency (P045) is set to “
Auto
”.
Site conditions sometimes require a fixed frequency. Target Frequency (P045) is used to set a
fixed frequency, but the actual frequency value used is selected from the look-up table and the
nearest to that entered value is selected automatically.
Note
See also
Frequency
) for the actual frequency used.
Field Communicator or AMS
To view or change the target frequency:
1.
From the
Home
screen, select
2: Configure
.
2.
Select
2: Manual Setup
.
3.
Select
7: Advanced Processing
.
4.
Select
6: Set Frequency
.
5.
Select
1: Target Frequency P045
.
6.
Select a new setting, and then select “
ENTER
” to save it.
7.
Press “
SEND
” to update the transmitter.
Rosemount 3490 Series Control Unit
To view or change the target frequency:
1.
From the
Main Menu
screen, select
SETUP
.
2.
Select the transmitter (e.g. “
Tx1: 3107
”).
3.
Select
ENGINEERING
.
4.
Select
ADVANCED
.
5.
Select
Target Freq
.
6.
Follow the on-screen instructions to edit and save the new setting.
(Press the
Enter
(
) key if prompted to change the mode to “off-line”).
7.
Select “
Quit
” to exit to the previous menu.
Fast Keys
2, 2, 7, 6, 1
Target Frequency P045
AUTOMATIC
50 kHz
51 kHz
53 kHz
54 kHz
56 kHz
58 kHz
AUTOMATIC
AUTOMATIC
ENTER
ESC
(Field Communicator Screen)
Target Freq P045
Auto kHz
Esc=Quit =Edit
(Rosemount 3491 Screen)
Содержание 3107
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