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Reference Manual
IP2048/RM, Rev AA
Appendix F: Configuring Using HART
February 2015
F.4.11 Speed of sound (D914)
This indicates the temperature-corrected speed of sound calculated by the transmitter. It relates
the returned echo time delay to a distance. The value is calculated using the Temperature SoS
Calc value (page 158) and the base value entered into configuration parameter Speed of Sound
(page 131).
Field Communicator
To view the calculated speed of sound:
1. From the Home screen, select 3: Service Tools.
2. Select 1: Alerts.
3. Select 2: Diagnostic Data.
4. Select 2: Speed of Sound Data.
5. Select 1: Speed of Sound D914.
6. When finished, press “EXIT” to return to the previous menu.
Mobrey MCU900 Series control unit
To view the calculated speed of sound:
1. From the Main Menu screen, select MONITOR.
2. Select the transmitter (e.g. “Tx1:MSP400RH”).
3. Select DIAGNOSTICS.
4. Select Speed of Sound.
5. When finished, press the ESC key to exit to the previous menu.
Fast Keys
3, 1, 2, 2, 1
Speed of Sound D914
1133.040 ft/s
EXIT
HELP
(Field Communicator Screen)
Speed of Sound D914
1133.0ft/s
(Mobrey MCU901 Screen)