131
Reference Manual
IP2048/RM, Rev AA
Appendix F: Configuring Using HART
January 2015
Mobrey MCU900 Series control unit
To view or change the lost echo action:
1.
From the
Main Menu
screen, select
SETUP
.
2.
Select the transmitter (e.g. “
Tx1:MSP400RH
”).
3.
Select
ENGINEERING
.
4.
Select
LE Action
.
5.
Follow the on-screen instructions to edit and save the new setting.
(Press the
Enter
(
) key if prompted to change mode to “
off-line
”).
6.
Select “
Quit
” to exit to the previous menu.
F.3.26
Speed of sound (P024)
This is for entering the speed of sound of the gas above the liquid surface (ullage gas) in a closed
tank at 32
F (0
C) (see
Table F-2
).
A new speed of sound is then calculated for the ullage gas at the temperature and humidity level
in the tank (see calculated
Speed of Sound
on
page 158
). The correction for temperature
effects is made using the parameter
Temperature
(
page 132
) and assumes the entered Speed
of Sound (P024) value is valid at 32
F (0
C).
For systems monitoring aqueous liquids with air (or nitrogen) as the primary gas in the ullage
space, the entered Speed of Sound (P024) value should be 1088.6 ft/s (331.80 m/s). This is the
most accurate setting for temperatures in the range of 32 to 104
F (0 to 40
C).
If the tank vapor space is filled with a different gas, a revised Speed of Sound (P024) value should
be entered. Gas mixtures have speed of sound values calculated as an average according to the
proportion of the gases present.
Table F-2. Speed of sound for ullage gases at 32
F (0
C)
Fast Keys
2, 2, 5 [or 6], 4
Ullage Gas
Speed of Sound
ft/s (m/s)
Ullage Gas
Speed of Sound
ft/s (m/s)
Acetaldehyde
800.53 (244)
Ethylether
675.85 (206)
Ammonia
1361.55 (415)
Methane
1410.76 (430)
Argon
1010.50 (308)
Methanol
1099.08 (335)
Benzene
580.71 (177)
Nitrogen
1105.64 (337)
Carbon Tetrachloride
475.72 (145)
Nitric oxide
1095.80 (334)
Cyclohexane
593.83 (181)
Oxygen
1089.24 (332)
Ethane
1036.35 (316)
Propane
780.84 (238)
Ethylalcohol
846.46 (258)
Sulphur hexafluoride
436.35 (133)
LE Action
P022
Hold
Esc=Quit
=Edit
(Mobrey MCU901 Screen)
Summary of Contents for MSP400RH
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Page 16: ...6 Reference Manual IP2048 RM Rev AA Section 2 Transmitter Overview January 2015 ...
Page 54: ...44 Reference Manual IP2048 RM Rev AA Section 4 Starting up January 2015 ...
Page 80: ...70 Reference Manual IP2048 RM Rev AA Appendix A Reference Data January 2015 ...
Page 84: ...74 Reference Manual IP2048 RM Rev AA Appendix B Product Certifications January 2015 ...
Page 87: ...77 Reference Manual IP2048 RM Rev AA Appendix C Integrated Display Menus January 2015 ...
Page 90: ...80 Reference Manual IP2048 RM Rev AA Appendix C Integrated Display Menus January 2015 ...
Page 98: ...88 Reference Manual IP2048 RM Rev AA Appendix E Field Communicator January 2015 ...
