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Reference Manual
IP2048/RM, Rev AA
Appendix F: Configuring Using HART
February 2015
F.3.35 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 Frequency (page 159) for the actual frequency used.
Field Communicator
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 (MSP900GH) or
Select 8: Advanced Processing (MSP400RH)
4. Select 6: Set Frequency, and then 1: Target Frequency P045.
5. If a change is required:
(a) Select a new setting, and then select “ENTER” to save it.
(b) Press “SEND” to update the transmitter.
Mobrey MCU900 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:MSP400RH”).
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 mode to “off-line”).
7. Select “Quit” to exit to the previous menu.
Fast Keys
2, 2, 7 [or 8], 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
(Mobrey MCU901 Screen)