Ultraflux UF 801-P, Руководство пользователя

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NT228B GB2 98 / 98
This speed of sound varies also with the pressure and temperature, in a larger
proportion compared to water. For instance:
- Influence of pressure = + 1 m/s per bar for liquid butane and + 0.4 m/s per
bar for diesel oil.
- Influence of temperature = - 6 m/s per °C for butane and – 4 m/s per °C for
diesel oil.
Chemical or Other Products :
The list of products has no limitation. From version 4, UF 801-P offer a more
completed list of typical products encountered in the industry.
If you need some prior to test information, please ask us.
You can also do some tests by yourself, with the method explained in § 7.2
21.6 Applications with Gas
Gases are characterized by lower speed of sound, much lower than for liquids.
Temperature coefficients are positive (0.2% per degree approximately), and
pressure has low influence. Consult us for more details.
Here are two usual gases examples:
 Air: C = 341 m/s at 20 °C / 1 bar.
Approximate formula is C = 20.1 * (T
°K
)
1/2
 Natural gas: C around 400 m/s at 15 °C / 1 bar