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174
Reference Manual
00809-0100-4840, Rev CB
Appendix F: Programming the 3102 and 3105 using HART
February 2015
Programming the 3102 and 3105 using HART
F.3.29
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
).
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
). The correction for temperature effects
is made using the parameter Temperature (
) 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)
Field Communicator or AMS Device Manager
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 (
3105
) or
6: Engineering (
3102
).
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) Select “Send” or “Apply” to update the transmitter.
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)
Speed of Sound P024
1088.60 ft/s
1088.60
ESC
DEL
ENTER
HELP
w
s
q
a
z
Lock
Shift
@ &
á ü
x
e
d
c
r
f
v
t
g
b
y
h
n
u
j
m
*
-
+
/
.
0
7
4
1
7
4
1
7
4
1
i
k
o
l
FN
(
Field Communicator Screen Shown
)
Содержание Rosemount 3101
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