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Reference Manual
IP2048/RM, Rev AA
Appendix F: Configuring Using HART
February 2015
Field Communicator
To view or change the speed of sound setting:
1. From the Home screen, select 2: Configure.
2. Select 2: Manual Setup.
3. Select 5: Engineering (MSP900GH)
or 6: Engineering (MSP400RH).
4. Select 4: Speed of Sound P024.
5. If a change is required:
(a) Input a new value, and then select “ENTER” to save it.
(b) Press “SEND” to update the transmitter.
Mobrey MCU900 Series control unit
To view or change the speed of sound setting:
1. From the Main Menu screen, select SETUP.
2. Select the transmitter (e.g. “Tx1:MSP400RH”).
3. Select ENGINEERING, and then Speed of Sound.
4. 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”).
5. Select “Quit” to exit to the previous menu.
F.3.27 Temperature (P025)
This is for temperature-correcting the speed of sound base value in parameter Speed of Sound
(page 131).
For automatic (dynamic) corrections using the internal or optional remote temperature sensor,
select the “Auto” option. The live temperature measurement is indicated in the read-only
parameter Temperature SoS Calculation (page 158). If the sensor fails and “Auto” is selected,
the setting reverts to 68 F (20 C).
Note
The internal temperature sensor measures the air temperature at the transmitter, and not
the average temperature across the ullage space. If the average temperature is known,
enter this into P025. The same value is then indicated by the read-only parameter
Temperature For SoS Calculation (page 158) and is used to correct the speed of sound.
Fast Keys
2, 2, 8 [or 9], 1, 5
Speed of Sound P024
1088.60 ft/s
1088.60
ESC
DEL ENTER
HELP
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(Field Communicator Screen)
Speed of Sound P024
1088.6ft/s
Esc=Quit =Edit
(Mobrey MCU901 Screen)