Velocity Of Sound In Gases Other Than Air; Specifications; Performance - Magnetrol Echotel 335 Installation And Operating Manual

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2.5

Velocity of Sound in Gases other than Air

The velocity of sound through air is 1,128 ft/sec
(343.8 m/sec) as indicated in P31. This velocity is used for
all measurements made by the Model 335 transmitter. The
table below contains the velocity of sound for various gases
measured @ +68° F (+20° C). These velocities can be used
in P31 if the gas exists as a homogeneous layer in the tank.
Gases
Acetaldehyde
Acetylene
Ammonia
Argon
Benzene
Carbon dioxide
Carbon monoxide
Carbon tetrachloride
Chlorine
Dimethyl ether
Ethane
Ethanol
Ethylene
Helium
Hydrogen sulphide
Methane
Methanol
Neon
Nitrogen
Nitrous oxide
Oxygen
Propane
Sulfur hexafluoride
2.6

Specifications

2.6.1 Performance

ccuracy
Resolution
Velocity
Chemical Formula (ft/sec)
C H O 829.4
2 4
C H 1118.2
2 2
NH 1410.5
3
Ar 1047.0
C H 601.7
6 6
CO 880.3
2
CO 1145.7
CCl 492.8
4
Cl 697.9
2
CH OCH 700.2
3 3
C H 1074.2
2 6
C H OH 877.0
2 3
C H 1080.8
2 4
He 3263.0
H S 1053.5
2
CH 1461.7
4
CH OH 1138.5
3
Ne 1475.1
N 1145.4
2
N O 1135.2
2
O 1078.1
2
C H 808.8
3 8
SF 452.1
6
(±0.2% of the measured
distance, plus 0.05% of the
range)
1 mm for up to 6.5 feet (2 m)
2 mm for 6.5 to 16.4 feet (5 m)
5 mm for 16.4 to 26 feet (8m)
51-637 Echotel Model 335 Ultrasonic Transmitter
Velocity
(m/s)
252.8
340.8
429.9
319.1
183.4
268.3
349.2
150.2
212.7
213.4
327.4
267.3
329.4
994.5
321.1
445.5
347
449.6
349.1
346
328.6
246.5
137.8